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Li J, Si Z, Shang K, Wu Y, Feng Y, Wang S, Li S. Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials. Polymers (Basel) 2023; 15:polym15081883. [PMID: 37112030 PMCID: PMC10145786 DOI: 10.3390/polym15081883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 03/29/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
The rheological behaviors of low-density polyethylene doped with additives (PEDA) determine the dynamic extrusion molding and structure of high-voltage cable insulation. However, the coupling effect of additives and molecular chain structure of LDPE on the rheological behaviors of PEDA is still unclear. Here, for the first time, the rheological behaviors of PEDA under uncross-linked conditions are revealed by experiment and simulation analysis, as well as rheology models. The rheology experiment and molecular simulation results indicate that additives can reduce the shear viscosity of PEDA, but the effect degree of different additives on rheological behaviors is determined by both chemical composition and topological structure. Combined with experiment analysis and the Doi-Edwards model, it demonstrates that the zero-shear viscosity is only determined by LDPE molecular chain structure. Nevertheless, different molecular chain structures of LDPE have different coupling effects with additives on the shear viscosity and non-Newtonian feature. Given this, the rheological behaviors of PEDA are predominant by the molecular chain structure of LDPE and are also affected by additives. This work can provide an important theoretical basis for the optimization and regulation of rheological behaviors of PEDA materials used for high-voltage cable insulation.
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Affiliation(s)
- Jiacai Li
- State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Zhicheng Si
- State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Kai Shang
- State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yifan Wu
- State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yang Feng
- State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Shihang Wang
- State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Shengtao Li
- State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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2
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Jani F, Sepahi A, Afzali SK, Houshmand Moayed S. Experimental study on the effect of molecular weight and chemical composition distribution on the mechanical response of high‐density polyethylene. POLYM ENG SCI 2022. [DOI: 10.1002/pen.26196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Farzad Jani
- Department of Research and Development Jam Petrochemical Company Asaluyeh Iran
| | - Abdolhannan Sepahi
- Department of Research and Development Jam Petrochemical Company Asaluyeh Iran
| | - Seyyed Kamal Afzali
- Department of Research and Development Jam Petrochemical Company Asaluyeh Iran
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3
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Kenyon P, Leung DWJ, Turner ZR, Buffet JC, O’Hare D. Tuning Polyethylene Molecular Weight Distributions Using Catalyst Support Composition. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Philip Kenyon
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - D. W. Justin Leung
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Zoë R. Turner
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Jean-Charles Buffet
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Dermot O’Hare
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
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4
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Duan T, Bian Q, Li H. Light-Responsive Dynamic Protein Hydrogels Based on LOVTRAP. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10214-10222. [PMID: 34396769 DOI: 10.1021/acs.langmuir.1c01699] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Protein-based hydrogels can mimic many aspects of native extracellular matrices (ECMs) and are promising biomedical materials that find various applications in cell proliferation, drug/cell delivery, and tissue engineering. To be adapted for different tasks, it is important that the mechanical and/or biochemical properties of protein-based hydrogels can be regulated by external stimuli. Light as a regulation stimulus is of advantage because it can be easily applied in demanded spatiotemporal manners. The noncovalent binding between the light-oxygen-voltage-sensing domain 2 (LOV2) and its binding partner ZDark1 (zdk1), named as LOVTRAP, is a light-responsive interaction. The binding affinity of LOVTRAP is much higher in dark than that under blue light irradiation. Taking advantage of these light-responsive interactions, herein we endeavored to use LOVTRAP as a crosslinking mechanism to engineer light-responsive protein hydrogels. Using LOV2-containing and zdk1-containing multifunctional protein building blocks, we successfully engineered a light-responsive protein hydrogel whose viscoelastic properties can change in response to light: in the dark, the hydrogel showed higher storage modulus; under blue light irradiation, the storage modulus decreased. Due to the noncovalent nature of the LOVTRAP, the engineered LOVTRAP protein hydrogels displayed shear-thinning and self-healing properties and served as an excellent injectable protein hydrogel. We anticipated that this new class of light-responsive protein hydrogels will broaden the scope of dynamic protein hydrogels and help develop other light-responsive protein hydrogels for biomedical applications.
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Affiliation(s)
- Tianyu Duan
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Qingyuan Bian
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Hongbin Li
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
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5
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Du M, Jariyavidyanont K, Kühnert I, Boldt R, Androsch R. Effect of Molar Mass on Critical Specific Work of Flow for Shear-Induced Crystal Nucleation in Poly (l-Lactic Acid). Polymers (Basel) 2021; 13:1266. [PMID: 33924682 PMCID: PMC8069781 DOI: 10.3390/polym13081266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/09/2021] [Accepted: 04/11/2021] [Indexed: 11/16/2022] Open
Abstract
The concept of specific work of flow has been applied for the analysis of critical shearing conditions for the formation of crystal nuclei in poly (l-lactic acid) (PLLA). Systematic variation in both time and rate of shearing the melt in a parallel-plate rheometer revealed that these parameters are interconvertible regarding the shear-induced formation of crystal nuclei; that is, low shear rate can be compensated for by increasing the shear time and vice versa. This result supports the view that critical shearing conditions can be expressed by a single quantity, providing additional options for tailoring polymer processing routes when enhanced nuclei formation is desired/unwanted. Analysis of PLLA of different mass-average molar masses of 70, 90, 120, and 576 kDa confirmed improved shear-induced crystal nucleation for materials of higher molar mass, with critical specific works of flow, above which shear-induced nuclei formation occurs, of 550, 60, 25, and 5 kPa, respectively.
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Affiliation(s)
- Mengxue Du
- Interdisciplinary Center for Transfer-oriented Research in Natural Sciences, Martin Luther University Halle-Wittenberg, 06099 Halle/Saale, Germany;
| | - Katalee Jariyavidyanont
- Interdisciplinary Center for Transfer-oriented Research in Natural Sciences, Martin Luther University Halle-Wittenberg, 06099 Halle/Saale, Germany;
| | - Ines Kühnert
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany; (I.K.); (R.B.)
| | - Regine Boldt
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany; (I.K.); (R.B.)
| | - René Androsch
- Interdisciplinary Center for Transfer-oriented Research in Natural Sciences, Martin Luther University Halle-Wittenberg, 06099 Halle/Saale, Germany;
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6
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Rheological Behavior of Blends of Metallocene Catalyzed Long-Chain Branched Polyethylenes. Part I: Shear Rheological and Thermorheological Behavior. Polymers (Basel) 2021; 13:polym13030328. [PMID: 33498543 PMCID: PMC7864184 DOI: 10.3390/polym13030328] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/12/2021] [Accepted: 01/15/2021] [Indexed: 11/17/2022] Open
Abstract
Long-chain branched metallocene-catalyzed high-density polyethylenes (LCB-mHDPE) were solution blended to obtain blends with varying degrees of branching. A high molecular LCB-mHDPE was mixed with low molecular LCB-mHDPE at varying concentrations. The rheological behavior of those low molecular LCB-mHDPE is similar but their molar mass and molar mass distribution are significantly different. Those blends were characterized rheologically to study the effects of concentration, molar mass distribution, and long-chain branching level of the low molecular LCB-mHDPE. Owing to the ultra-long relaxation times of the high molecular LCB-mHDPE, the blends exhibited a clearly more long-chain branched behavior than the base materials. The thermorheological complexity analysis showed an apparent increase in the activation energies Ea determined from G′, G″, and especially δ. Ea(δ), which for LCB-mHDPE is a peak function, turned out to produce even more pronounced peaks than observed for LCB-mPE with narrow molar mass distribution and also LCB-mPE with broader molar mass distribution. Thus, it is possible to estimate the molar mass distribution from the details of the thermorheological complexity.
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7
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Behboudi T, Davachi SM, Jahani Y. The effect of initiator, polyfunctional monomer and polybutene-1 resin on the long chain branching of random polypropylene copolymer via reactive extruder. POLYM-PLAST TECH MAT 2020. [DOI: 10.1080/25740881.2020.1811320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Tahereh Behboudi
- Faculty of Processing, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - Seyed Mohammad Davachi
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, NY, USA
| | - Yousef Jahani
- Faculty of Processing, Iran Polymer and Petrochemical Institute, Tehran, Iran
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8
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Kalantar Mehrjerdi A, Bashir T, Skrifvars M. Melt rheology and extrudate swell properties of talc filled polyethylene compounds. Heliyon 2020; 6:e04060. [PMID: 32490251 PMCID: PMC7260442 DOI: 10.1016/j.heliyon.2020.e04060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 02/14/2020] [Accepted: 05/20/2020] [Indexed: 11/01/2022] Open
Abstract
An experimental study of high-density polyethylene (HDPE) composites filled with talc (0-15 wt.%) was carried out to investigate the rheological properties. The apparent melt viscosity, melt density, and die-swell ratio (B) of the composites were measured at constant shear stress and constant shear rate by using a melt flow indexer and capillary rheometer. The experimental conditions were set to a temperature range from 190 to 220 °C for both apparatuses whereas a load range from 5 to 12.16 kg was selected for melt flow indexer and shear rate range from 1 to 10000 s-1 for capillary rheometer. The initial study showed that the talc particulates did not influence the melt viscosity compared with the neat HDPE but decreased the elasticity of the polymer system. The HDPE/talc systems obeyed power-law model in shear stress-shear rate variations and were shear thinning, meanwhile, the die-swell increased with an increased wall shear rate and shear stress. The melt density of the composites increased linearly with an increase of the filler weight fraction and decreased with the increase of the testing temperature. The talc-HDPE composites showed compressible in the molten state.
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Affiliation(s)
| | - Tariq Bashir
- Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden
| | - Mikael Skrifvars
- Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden
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9
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Han Q, Zhao L, Lin P, Zhu Z, Nie K, Yang F, Wang L. Poly(butylene succinate) biocomposite modified by amino functionalized ramie fiber fabric towards exceptional mechanical performance and biodegradability. REACT FUNCT POLYM 2020. [DOI: 10.1016/j.reactfunctpolym.2019.104443] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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10
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Tayebi SS, Jahani Y, Arabi H. Trimethylolpropane trimethacrylate functionalized polypropylene/polyhexene-1 blend with enhanced melt strength. POLYM-PLAST TECH MAT 2019. [DOI: 10.1080/25740881.2019.1669653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Seyed Saeid Tayebi
- Faculty of Processing, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - Yousef Jahani
- Faculty of Processing, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - Hassan Arabi
- Faculty of Processing, Iran Polymer and Petrochemical Institute, Tehran, Iran
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11
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Rahaman M, Hussein IA, Aldalbahi A, Parvez A, Soares JBP. Synthesis of Metallocene Catalyzed Ethylene 1,7-Octadiene Copolymer: Effect of Copolymerization on Polymer Properties. Macromol Res 2018. [DOI: 10.1007/s13233-018-6049-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Porous Organic Polymers-Supported Metallocene Catalysts for Ethylene/1-Hexene Copolymerization. Catalysts 2018. [DOI: 10.3390/catal8040146] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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13
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Barczewski M, Lewandowski K, Schmidt M, Szostak M. Melt fracture and rheology of linear low density polyethylene - calcium carbonate composites. POLYM ENG SCI 2016. [DOI: 10.1002/pen.24477] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Mateusz Barczewski
- Institute of Materials Technology; Poznan University of Technology; Piotrowo 3 Poznań 61-138 Poznan Poland
| | - Krzysztof Lewandowski
- Faculty of Chemical Technology and Engineering; University of Technology and Life Sciences in Bydgoszcz; Seminaryjna 3 Bydgoszcz 85-326 Poland
| | - Marcin Schmidt
- Institute of Materials Technology; Poznan University of Technology; Piotrowo 3 Poznań 61-138 Poznan Poland
| | - Marek Szostak
- Institute of Materials Technology; Poznan University of Technology; Piotrowo 3 Poznań 61-138 Poznan Poland
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14
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Woo Inn Y, Sukhadia AM, Whitte WM. A study of “worms” melt fracture in polyethylene extrusion blow molding process using capillary rheometry. POLYM ENG SCI 2016. [DOI: 10.1002/pen.24291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yong Woo Inn
- Chevron Phillips Chemical Company LP; Bartlesville Research and Technology Center; Bartlesville Oklahoma 74004-0001
| | - Ashish M. Sukhadia
- Chevron Phillips Chemical Company LP; Bartlesville Research and Technology Center; Bartlesville Oklahoma 74004-0001
| | - William M. Whitte
- Chevron Phillips Chemical Company LP; Bartlesville Research and Technology Center; Bartlesville Oklahoma 74004-0001
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15
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Abstract
Abstract
When certain critical conditions are exceeded, the flow of a polymer melt becomes unstable, giving rise to particular phenomena that are the subject of this review. These instabilities are a vital industrial problem, as they are the key to productivity of extrusion processes. Indeed, their onset leads to unacceptable products and is thus the upper limit of the processing conditions. They are also a fascinating scientific problem because, although studied and discussed for more than half a century, they are still not fully understood and their mechanisms are still sometimes controversial. In the present literature review, we present an overview of the studies carried out for fifty years, as well as our own opinion on the underlying mechanisms.
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Affiliation(s)
- B. Vergnes
- MINES ParisTech , CEMEF, UMR CNRS 7635, Sophia Antipolis , France
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16
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Chen Y, Luo W, Li Y, Zou H, Liang M, Cao Y. Melt flow instabilities in polyethylene resins. POLYMER SCIENCE SERIES A 2014. [DOI: 10.1134/s0965545x1405006x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Barrett JSF, Abdala AA, Srienc F. Poly(hydroxyalkanoate) Elastomers and Their Graphene Nanocomposites. Macromolecules 2014. [DOI: 10.1021/ma500022x] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- John S. F. Barrett
- Department
of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
- Biotechnology
Institute, University of Minnesota, St. Paul, Minnesota 55108, United States
| | - Ahmed A. Abdala
- Department
of Chemical Engineering, the Petroleum Institute, Abu Dhabi, United Arab Emirates
- Department
of Chemical Engineering and Petroleum Refining, Faculty of Petroleum
and Mining Engineering, Suez University, Suez, Egypt
| | - Friedrich Srienc
- Department
of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
- Biotechnology
Institute, University of Minnesota, St. Paul, Minnesota 55108, United States
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18
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Wever DAZ, Polgar LM, Stuart MCA, Picchioni F, Broekhuis AA. Polymer Molecular Architecture As a Tool for Controlling the Rheological Properties of Aqueous Polyacrylamide Solutions for Enhanced Oil Recovery. Ind Eng Chem Res 2013. [DOI: 10.1021/ie403045y] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Diego A. Z. Wever
- Department
of Chemical Engineering-Product Technology, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG, The Netherlands
- Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Lorenzo M. Polgar
- Department
of Chemical Engineering-Product Technology, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG, The Netherlands
| | - Marc C. A. Stuart
- Electron Microscopy-Groningen Biomolecular Sciences and Biotechnology Institute, Rijksuniversiteit Groningen, Nijeborgh 7, 9747 AG, The Netherlands
| | - Francesco Picchioni
- Department
of Chemical Engineering-Product Technology, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG, The Netherlands
| | - Antonius A. Broekhuis
- Department
of Chemical Engineering-Product Technology, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG, The Netherlands
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19
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Kanev D, Takacs E, Vlachopoulos J. Rheological Evaluation and Observations of Extrusion Instabilities of Biodegradable Polyesters. INT POLYM PROC 2013. [DOI: 10.3139/217.2053] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The rheological properties of two commercially available biodegradable polyesters – poly(lactic acid) (PLA) and aliphatic-aromatic co-polyester Ecoflex™ – have been investigated. The rheological study was focused on measuring the viscosity and examining sharkskin, melt fracture, and extrudate swell phenomena, which are crucial in industrial applications. The experiments show that the two biodegradable polyesters exhibit shear-thinning behavior similar to other polymers and the Cox-Merz rule is obeyed. It was observed that with increasing shear rate PLA exhibits sharkskin and gross melt fracture while Ecoflex™ exhibits only gross melt fracture. Experimental results indicate that both biodegradable polyesters exhibit small extrudate swell, up to 28% for PLA and up to 34% for Ecoflex™.
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Affiliation(s)
- D. Kanev
- Department of Chemical Engineering, McMaster University, Hamilton, ON, Canada
| | - E. Takacs
- Department of Chemical Engineering, McMaster University, Hamilton, ON, Canada
| | - J. Vlachopoulos
- Department of Chemical Engineering, McMaster University, Hamilton, ON, Canada
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20
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Shen HW, Xie BH, Yang W, Yang MB. Thermal and rheological properties of polyethylene blends with bimodal molecular weight distribution. J Appl Polym Sci 2013. [DOI: 10.1002/app.38850] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Ansari M, Inn YW, Sukhadia AM, DesLauriers PJ, Hatzikiriakos SG. Melt fracture of HDPEs: Metallocene versus Ziegler–Natta and broad MWD effects. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.07.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Ansari M, Hatzikiriakos SG, Sukhadia AM, Rohlfing DC. Melt fracture of two broad molecular weight distribution high-density polyethylenes. POLYM ENG SCI 2011. [DOI: 10.1002/pen.22144] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Adesina AA, Hussein IA. Impact of organoclay and maleated polyethylene on the rheology and instabilities in the extrusion of high density polyethylene. J Appl Polym Sci 2011. [DOI: 10.1002/app.34523] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Shen HW, Luan T, Xie BH, Yang W, Yang MB. Rheological behaviors and molecular weight distribution characteristics of bimodal high-density polyethylene. J Appl Polym Sci 2011. [DOI: 10.1002/app.33698] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Lin C, Wang S, Sun H, Li J, Guo S. Real-time ultrasonic characterization of the chain orientation of high density polyethylene melts during processing. POLYM ENG SCI 2010. [DOI: 10.1002/pen.21634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Pol HV, Joshi YM, Tapadia PS, Lele AK, Mashelkar RA. A Geometrical Solution to the Sharkskin Instability. Ind Eng Chem Res 2006. [DOI: 10.1021/ie0610391] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Harshawardhan V. Pol
- Polymer Science and Engineering Division, National Chemical Laboratory, Pune 411008, India, Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Kanpur 208016, India, and Council of Scientific and Industrial Research, Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110001, India
| | - Yogesh M. Joshi
- Polymer Science and Engineering Division, National Chemical Laboratory, Pune 411008, India, Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Kanpur 208016, India, and Council of Scientific and Industrial Research, Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110001, India
| | - Prashant S. Tapadia
- Polymer Science and Engineering Division, National Chemical Laboratory, Pune 411008, India, Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Kanpur 208016, India, and Council of Scientific and Industrial Research, Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110001, India
| | - Ashish K. Lele
- Polymer Science and Engineering Division, National Chemical Laboratory, Pune 411008, India, Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Kanpur 208016, India, and Council of Scientific and Industrial Research, Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110001, India
| | - Raghunath A. Mashelkar
- Polymer Science and Engineering Division, National Chemical Laboratory, Pune 411008, India, Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Kanpur 208016, India, and Council of Scientific and Industrial Research, Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110001, India
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27
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Sun G, Li H. Influence of intercalated montmorillonite/polyethylene glycol binary processing aids on the rheological and mechanical properties of metallocene linear low-density polyethylene. Polym Bull (Berl) 2006. [DOI: 10.1007/s00289-006-0654-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Basso GM, Paulin-Filho PI, Bretas RES, Bernardi A. Correlação entre propriedades reológicas e ópticas de filmes tubulares de polietileno linear de baixa densidade com diferentes distribuições de ramificações curtas. POLIMEROS 2006. [DOI: 10.1590/s0104-14282006000200016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Devido a suas excelentes propriedades mecânicas o polietileno linear de baixa densidade, PELBD, tem ganhado cada vez mais importância na indústria de embalagens. Essas propriedades são resultado de sua estrutura molecular, da existência de ramificações curtas, SCB, e da distribuição dessas ramificações, DSCB. Junto com o peso molecular, PM, e sua distribuição, DPM, as ramificações curtas também afetam o processo de sopro de filmes influenciando na solidificação do filme até a linha de neve, já que a cinética de cristalização é dependente da distribuição destas ramificações. Assim, este trabalho teve como objetivo verificar a influência da DSCB do PELBD nas propriedades reológicas e óticas de filmes tubulares. Para isso, três PELBD foram escolhidos; dois sintetizados com catalisador Ziegler-Natta e um com catalisador metaloceno, de peso molecular ponderal médio, Mw, similar e DSCB diferentes. Observou-se que a DSCB exerce influência nas propriedades reológicas que refletem a elasticidade do material como a primeira diferença de tensões normais N1, o módulo de armazenamento G'(<FONT FACE=Symbol>w</font>), e a deformação recuperável gamar; entretanto na viscosidade em função da taxa de cisalhamento eta(gama), e no módulo de perda G"(ômega), a diferença nessa distribuição não foi percebida. Observou-se também que quanto maior a deformação recuperável dos PELBD, menores foram as estruturas cristalinas formadas o que diminuiu a opacidade dos filmes. Porém essa proporcionalidade manteve-se até uma determinada gamar mínima, acima da qual a fratura do fundido se sobrepôs à recuperação da deformação e a opacidade voltou a aumentar.
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Hussein IA, Hameed T, Williams MC. Influence of molecular structure on the rheology and thermorheology of metallocene polyethylenes. J Appl Polym Sci 2006. [DOI: 10.1002/app.24353] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Liu X, Li H. Effect of diatomite/polyethylene glycol binary processing aid on the melt fracture and the rheology of polyethylenes. POLYM ENG SCI 2005. [DOI: 10.1002/pen.20355] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Liu X, Xie M, Li H. Effect of inorganic fillers in binary processing aids on the rheology of a metallocene linear low-density polyethylene. J Appl Polym Sci 2005. [DOI: 10.1002/app.20968] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Guerrini LM, Paulin Fº PI, Bretas RES, Bernardi A. Correlação entre as propriedades reológicas, óticas e a morfologia de filmes soprados de LLDPE/LDPE. POLIMEROS 2004. [DOI: 10.1590/s0104-14282004000100012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Neste trabalho correlações entre as propriedades reológicas e óticas e a morfologia de filmes soprados de polietileno linear de baixa densidade, LLDPE, e de suas blendas com 10% e 20 % de polietileno de baixa densidade, LDPE, foram pesquisadas. Os filmes foram processados em uma sopradora industrial. As propriedades reológicas estudadas foram : a viscosidade em regime permanente de cisalhamento, h(<img border=0 id="_x0000_i1026" src="../../../../../img/revistas/po/v14n1/19868x8.gif" align=absmiddle>), a primeira diferença de tensões normais, N1(<img border=0 id="_x0000_i1027" src="../../../../../img/revistas/po/v14n1/19868x1.gif" align=texttop>), o módulo complexo em cisalhamento, G* (ômega) e a deformação recuperável, gamar (t). h(<img border=0 id="_x0000_i1028" src="../../../../../img/revistas/po/v14n1/19868x1.gif" align=texttop>) e N1(<img border=0 id="_x0000_i1029" src="../../../../../img/revistas/po/v14n1/19868x1.gif" align=texttop>)foram medidos num reômetro de deformação controlada com cone e placa (taxas baixas) e num capilar (taxas elevadas); G* (ômega) e gamar(t) foram medidos num reômetro de tensão controlada com placas paralelas. As propriedades óticas (brilho e opacidade) foram medidas num opacímetro. As morfologias superficiais dos filmes soprados foram analisadas por microscopia eletrônica de varredura e microscopia de força atômica. Uma correlação entre deformação recuperável, opacidade total e morfologia dos filmes das blendas de LLDPE/LDPE foi obtida: quanto maior a recuperação elástica, menor a opacidade total e menor o tamanho do cristalito. A adição do LDPE ao LLDPE aumentou a deformação recuperável das blendas, diminuindo as suas opacidades.
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Rathod N, Hatzikiriakos SG. The effect of surface energy of boron nitride on polymer processability. POLYM ENG SCI 2004. [DOI: 10.1002/pen.20151] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hatzikiriakos SG. Long chain branching and polydispersity effects on the rheological properties of polyethylenes. POLYM ENG SCI 2004. [DOI: 10.1002/pen.11360] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Thompson MR, Xi C, Takacs E, Tate M, Vlachopoulos J. Experiments and flow analysis of a micropelletizing die. POLYM ENG SCI 2004. [DOI: 10.1002/pen.20134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Aguilar M, Vega J, Peña B, Martınez-Salazar J. Novel features of the rheological behaviour of metallocene catalysed atactic polypropylene. POLYMER 2003. [DOI: 10.1016/s0032-3861(02)00901-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Shan CLP, Soares JB, Penlidis A. HDPE/LLDPE reactor blends with bimodal microstructures—Part II: rheological properties. POLYMER 2003. [DOI: 10.1016/s0032-3861(02)00721-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Guo S, Li Y, Chen G, Li H. Ultrasonic improvement of rheological and processing behaviour of LLDPE during extrusion. POLYM INT 2003. [DOI: 10.1002/pi.1005] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Xu J, Xu X, Zheng Q, Feng L, Chen W. Dynamic rheological behaviors of metallocene-based ethylene–butene copolymers and their blends with low-density polyethylene. Eur Polym J 2002. [DOI: 10.1016/s0014-3057(01)00057-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ariawan AB, Hatzikiriakos SG, Goyal SK, Hay H. Effects of molecular structure on the rheology and processability of blow-molding high-density polyethylene resins. ADVANCES IN POLYMER TECHNOLOGY 2001. [DOI: 10.1002/1098-2329(200121)20:1<1::aid-adv1000>3.0.co;2-o] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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