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Azimi Dijvejin Z, Ghaffarkhah A, Sadeghnejad S, Vafaie Sefti M. Effect of silica nanoparticle size on the mechanical strength and wellbore plugging performance of SPAM/chromium (III) acetate nanocomposite gels. Polym J 2019. [DOI: 10.1038/s41428-019-0178-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ma Y, He L, Jia M, Zhao L, Zuo Y, Hu P. Cage and linear structured polysiloxane/epoxy hybrids for coatings: Surface property and film permeability. J Colloid Interface Sci 2017; 500:349-357. [PMID: 28431258 DOI: 10.1016/j.jcis.2017.04.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Revised: 04/02/2017] [Accepted: 04/09/2017] [Indexed: 10/19/2022]
Abstract
Three polysiloxane/epoxy hybrids obtained by evolving cage- or linear-structured polysiloxane into poly glycidyl methacrylate (PGMA) matrix are compared used as coatings. One is the cage-structured hybrid of P(GMA/MA-POSS) copolymer obtained by GMA and methacrylisobutyl polyhedral oligomeric silsesquioxane (MA-POSS) via free radical polymerization, the other two are PGMA/NH2-POSS and PGMA/NH2-PDMS hybrids by cage-structured aminopropyllsobutyl POSS (NH2-POSS) or linear-structured diamino terminated poly(dimethylsiloxane) (NH2-PDMS) to cure PGMA. The effect of MA-POSS, NH2-POSS and NH2-PDMS on polysiloxane/epoxy hybrid films is characterized according to their surface morphology, transparency, permeability, adhesive strength and thermo-mechanical properties. Due to caged POSS tending to agglomerate onto the film surface, P(GMA/MA-POSS) and PGMA/NH2-POSS films exhibit much more heterogeneous surfaces than PGMA/NH2-PDMS film, but the well-compatibility between epoxy matrix and MA-POSS has provided P(GMA/MA-POSS) film with much higher transmittance (98%) than PGMA/NH2-POSS film (24%), PGMA/NH2-PDMS film (27%) and traditional epoxy resin film (5%). The introduction of polysiloxane into epoxy matrix is confirmed to create hybrids with strong adhesive strength (526-1113N) and high thermos-stability (Tg=262-282°C), especially the cage-structured P(GMA/MA-POSS) hybrid (1113N and 282°C), but the flexible PDMS improves PGMA/NH2-PDMS hybrid with much higher storage modulus (519MPa) than PGMA/NH2-POSS (271MPa), which suggests that PDMS is advantage in improving the film stiffness than POSS cages. However, cage-structured P(GMA/MA-POSS) and PGMA/NH2-POSS indicate higher permeability than PGMA/NH2-PDMS and traditional epoxy resin. Comparatively, the cage-structured P(GMA/MA-POSS) hybrid is the best coating in transparency, permeability, adhesive strength and thermostability, but linear-structured PGMA/NH2-PDMS hybrid behaviors the best coating in mechanical property.
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Affiliation(s)
- Yanli Ma
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xianning West Road, 28, Xi'an 710049, China
| | - Ling He
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xianning West Road, 28, Xi'an 710049, China.
| | - Mengjun Jia
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xianning West Road, 28, Xi'an 710049, China
| | - Lingru Zhao
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xianning West Road, 28, Xi'an 710049, China
| | - Yanyan Zuo
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xianning West Road, 28, Xi'an 710049, China
| | - Pingan Hu
- Department of Chemistry, School of Science, Xi'an Jiaotong University, Xianning West Road, 28, Xi'an 710049, China
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Omara SS, Turky G, Ghoneim A, Thünemann AF, Abdel Rehim MH, Schönhals A. Hyperbranched poly(amidoamine)/kaolinite nanocomposites: Structure and charge carrier dynamics. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.06.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Román F, Colomer P, Calventus Y, Hutchinson JM. Study of the Molecular Dynamics of Multiarm Star Polymers with a Poly(ethyleneimine) Core and Poly(lactide) Multiarms. MATERIALS 2017; 10:ma10020127. [PMID: 28772486 PMCID: PMC5459105 DOI: 10.3390/ma10020127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 01/27/2017] [Accepted: 01/28/2017] [Indexed: 12/02/2022]
Abstract
Multiarm star polymers, denoted PEIx-PLAy and containing a hyperbranched poly(ethyleneimine) (PEI) core of different molecular weights x and poly(lactide) (PLA) arms with y ratio of lactide repeat units to N links were used in this work. Samples were preconditioned to remove the moisture content and then characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and dielectric relaxation spectroscopy (DRS). The glass transition temperature, Tg, is between 48 and 50 °C for all the PEIx-PLAy samples. The dielectric curves show four dipolar relaxations: γ, β, α, and α′ in order of increasing temperature. The temperatures at which these relaxations appear, together with their dependence on the frequency, allows relaxation maps to be drawn, from which the activation energies of the sub-Tg γ- and β-relaxations and the Vogel–Fulcher–Tammann parameters of the α-relaxation glass transition are obtained. The dependence of the characteristic features of these relaxations on the molecular weight of the PEI core and on the ratio of lactide repeat units to N links permits the assignation of molecular motions to each relaxation. The γ-relaxation is associated with local motions of the –OH groups of the poly(lactide) chains, the β-relaxation with motions of the main chain of poly(lactide), the α-relaxation with global motions of the complete assembly of PEI core and PLA arms, and the α′-relaxation is related to the normal mode relaxation due to fluctuations of the end-to-end vector in the PLA arms, without excluding the possibility that it could be a Maxwell–Wagner–Sillars type ionic peak because the material may have nano-regions of different conductivity.
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Affiliation(s)
- Frida Román
- Laboratori de Termodinàmica i Físicoquímica, TERFIQ, Departament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Barcelona Tech, Carrer Colom 11, Terrassa 08222, Spain.
| | - Pere Colomer
- Laboratori de Termodinàmica i Físicoquímica, TERFIQ, Departament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Barcelona Tech, Carrer Colom 11, Terrassa 08222, Spain.
| | - Yolanda Calventus
- Laboratori de Termodinàmica i Físicoquímica, TERFIQ, Departament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Barcelona Tech, Carrer Colom 11, Terrassa 08222, Spain.
| | - John M Hutchinson
- Laboratori de Termodinàmica i Físicoquímica, TERFIQ, Departament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Barcelona Tech, Carrer Colom 11, Terrassa 08222, Spain.
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Postpolymerization modification of a hydroxy monolith precursor. Part III. Activation of poly(hydroxyethyl methacrylate-co-pentaerythritol triacrylate) monolith with epoxy functionalities followed by bonding of glycerol, polyamines, and hydroxypropyl-β-cy. Electrophoresis 2016; 37:3178-3185. [DOI: 10.1002/elps.201600326] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 08/29/2016] [Accepted: 09/01/2016] [Indexed: 12/29/2022]
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Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix. MATERIALS 2016; 9:ma9030192. [PMID: 28773319 PMCID: PMC5456660 DOI: 10.3390/ma9030192] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 03/10/2016] [Indexed: 11/17/2022]
Abstract
The molecular mobility related to the glass transition and secondary relaxations in a hyperbranched polyethyleneimine, HBPEI, and its relaxation behaviour when incorporated into an epoxy resin matrix are investigated by dielectric relaxation spectroscopy (DRS) and dynamic mechanical analysis (DMA). Three systems are analysed: HBPEI, epoxy and an epoxy/HBPEI mixture, denoted ELP. The DRS behaviour is monitored in the ELP system in three stages: prior to curing, during curing, and in the fully cured system. In the stage prior to curing, DRS measurements show three dipolar relaxations: γ, β and α, for all systems (HBPEI, epoxy and ELP). The α-relaxation for the ELP system deviates significantly from that for HBPEI, but superposes on that for the epoxy resin. The fully cured thermoset displays both β- and α-relaxations. In DMA measurements, both α- and β-relaxations are observed in all systems and in both the uncured and fully cured systems, similar to the behaviour identified by DRS.
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Dendritic polyamidoamine-grafted halloysite nanotubes for fabricating toughened epoxy composites. IRANIAN POLYMER JOURNAL 2013. [DOI: 10.1007/s13726-013-0151-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nemoto T, Amir I, Konishi GI. Synthesis and Properties of a High-Molecular-Weight Organosoluble Bisphenol A Novolac. Polym J 2009. [DOI: 10.1295/polymj.pj2008199] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kawahara T, Takeuchi Y, Wei G, Shirai K, Yamauchi T, Tsubokawa N. Preparation of Antibacterial Polymer-Grafted Silica Nanoparticle and Surface Properties of Composites Filled with the Silica (2). Polym J 2009. [DOI: 10.1295/polymj.pj2009026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Takamura M, Yamauchi T, Tsubokawa N. Grafting and crosslinking reaction of carboxyl-terminated liquid rubber with silica nanoparticles and carbon black in the presence of Sc(OTf)3. REACT FUNCT POLYM 2008. [DOI: 10.1016/j.reactfunctpolym.2008.03.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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