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Experimental and computational analysis of a pharmaceutical-grade shape memory polymer applied to the development of gastroretentive drug delivery systems. J Mech Behav Biomed Mater 2021; 124:104814. [PMID: 34534845 DOI: 10.1016/j.jmbbm.2021.104814] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 08/10/2021] [Accepted: 09/03/2021] [Indexed: 11/23/2022]
Abstract
The present paper aims at developing an integrated experimental/computational approach towards the design of shape memory devices fabricated by hot-processing with potential for use as gastroretentive drug delivery systems (DDSs) and for personalized therapy if 4D printing is involved. The approach was tested on a plasticized poly(vinyl alcohol) (PVA) of pharmaceutical grade, with a glass transition temperature close to that of the human body (i.e., 37 °C). A comprehensive experimental analysis was conducted in order to fully characterize the PVA thermo-mechanical response as well as to provide the necessary data to calibrate and validate the numerical predictions, based on a thermo-viscoelastic constitutive model, implemented within a finite element framework. Particularly, a thorough thermal, mechanical, and shape memory characterization under different testing conditions and on different sample geometries was first performed. Then, a prototype consisting of an S-shaped device was fabricated, deformed in a temporary compact configuration and tested. Simulation results were compared with the results obtained from shape memory experiments carried out on the prototype. The proposed approach provided useful results and recommendations for the design of PVA-based shape memory DDSs.
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2
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Akbari R, Alamdarnejad G, Kokabi M. A constitutive model of thermoviscoelastic semicrystalline shape memory polymer considering viscous dissipation in the amorphous phase. J Appl Polym Sci 2020. [DOI: 10.1002/app.49398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Reza Akbari
- Department of Polymer Engineering, Faculty of Chemical EngineeringTarbiat Modares University Tehran Islamic Republic of Iran
| | - Ghazaleh Alamdarnejad
- Department of Polymer Engineering, Faculty of Chemical EngineeringTarbiat Modares University Tehran Islamic Republic of Iran
| | - Mehrdad Kokabi
- Department of Polymer Engineering, Faculty of Chemical EngineeringTarbiat Modares University Tehran Islamic Republic of Iran
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3
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Experimental analysis and mechanical modeling of effect of stress-relaxation on shape memory and recovery behavior of e-beam irradiated HDPE. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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4
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Jose S, George JJ, Siengchin S, Parameswaranpillai J. Introduction to Shape-Memory Polymers, Polymer Blends and Composites: State of the Art, Opportunities, New Challenges and Future Outlook. ADVANCED STRUCTURED MATERIALS 2020. [DOI: 10.1007/978-981-13-8574-2_1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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5
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Shape Memory Polymer Composite Actuator: Modeling Approach for Preliminary Design and Validation. ACTUATORS 2019. [DOI: 10.3390/act8030051] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The work at hand focuses on the modeling, prototyping, and experimental functionality test of a smart actuator based on shape memory polymer technology. Particular attention is paid to the specific modeling approach, here conceived as an effective predictive scheme, quick and, at the same time, able to face those nonlinearity aspects, strictly related to the large displacements shape memory polymers usually undergo. Shape memory polymer composites (SMPCs) may play a critical role for many applications, ranging from self-repairing systems to deployable structures (e.g., solar sails, antennas) and functional subcomponents (e.g., pliers, transporters of small objects). For all these applications, it is very important to have an effective tool that may drive the designers during the preliminary definition of the main parameters of the actuation system. For the present work, a SMPC plate sample has been conceived and realized in view of aerospace applications. An external fibre optic sensor has been then fixed with special adhesive. The temperatures needed for the activation of the Shape Memory Polymer (SMP) and strain storing have been provided by a thermo-gun and complete load–unload cycles, including strain storing, have been performed. Experimental displacements and strains have been used to validate a dedicated predictive theoretical approach, suited for laminates integrated with SMP layers.
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6
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Wu Y, Feng Y, Guo P. The polyurethane/polyacrylate soap-free emulsion formation: effects of hydrophilic polyurethane. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2019. [DOI: 10.1080/10601325.2018.1561151] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Yan Wu
- College of Material Science and Engineering, Chongqing Jiaotong University, Chongqing, China
| | - Yunxia Feng
- College of Material Science and Engineering, Chongqing Jiaotong University, Chongqing, China
| | - Peng Guo
- College of Material Science and Engineering, Chongqing Jiaotong University, Chongqing, China
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Ahmad Zubir S, Mat Saad N, Harun FW, Ali ES, Ahmad S. Incorporation of palm oil polyol in shape memory polyurethane: Implication for development of cardiovascular stent. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4412] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Syazana Ahmad Zubir
- School of Materials and Mineral Resources Engineering; Engineering Campus, Universiti Sains Malaysia; 14300 Nibong Tebal Pulau Pinang Malaysia
| | - Norshahli Mat Saad
- School of Materials and Mineral Resources Engineering; Engineering Campus, Universiti Sains Malaysia; 14300 Nibong Tebal Pulau Pinang Malaysia
| | - Farah Wahida Harun
- Department of Physics, Faculty of Science and Technology; Universiti Sains Islam Malaysia; 71800 Nilai Negeri Sembilan Malaysia
| | - Ernie Suzana Ali
- Department of Physics, Faculty of Science and Technology; Universiti Sains Islam Malaysia; 71800 Nilai Negeri Sembilan Malaysia
| | - Sahrim Ahmad
- School of Applied Physics, Faculty of Science and Technology; Universiti Kebangsaan Malaysia; 43600 Bangi Selangor Malaysia
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The molecular mechanism of the thermo-responsive shape memory effect of self-assembled poly-{2,5-bis[(4-butoxyphenyl)oxycarbonyl]styrene} fiber. IRANIAN POLYMER JOURNAL 2015. [DOI: 10.1007/s13726-015-0403-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Hager MD, Bode S, Weber C, Schubert US. Shape memory polymers: Past, present and future developments. Prog Polym Sci 2015. [DOI: 10.1016/j.progpolymsci.2015.04.002] [Citation(s) in RCA: 462] [Impact Index Per Article: 51.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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10
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Bonadies I, Izzo Renzi A, Cocca M, Avella M, Carfagna C, Persico P. Heat Storage and Dimensional Stability of Poly(vinyl alcohol) Based Foams Containing Microencapsulated Phase Change Materials. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02187] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Irene Bonadies
- Institute
for Polymers, Composites and Biomaterials, National Research Council of Italy, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
| | - Adolfo Izzo Renzi
- Department
of Chemical, Materials and Industrial Production Engineering, University of Naples “Federico II”, P.le Tecchio 80, 80125 Napoli, Italy
| | - Mariacristina Cocca
- Institute
for Polymers, Composites and Biomaterials, National Research Council of Italy, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
| | - Maurizio Avella
- Institute
for Polymers, Composites and Biomaterials, National Research Council of Italy, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
| | - Cosimo Carfagna
- Institute
for Polymers, Composites and Biomaterials, National Research Council of Italy, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
| | - Paola Persico
- Institute
for Macromolecular Studies, National Research Council of Italy, Via
Bassini 15, 20133 Milano, Italy
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11
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Yu K, Qi HJ. Temperature memory effect in amorphous shape memory polymers. SOFT MATTER 2014; 10:9423-9432. [PMID: 25354272 DOI: 10.1039/c4sm01816h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Temperature memory effect (TME) refers to the ability of shape memory polymers (SMPs) to memorize the temperature at which pre-deformation was conducted. In the past few years, this TME was experimentally demonstrated by comparing the applied programming temperature (Td) with a characteristic recovery temperature (Tc), which corresponds to either the maximum recovery stress or free recovery speed. In these well-designed experiments, Tc was observed to be close to Td, which is consistent with the intuitive understanding of 'memorization'. However, since the polymer recovery behavior has been proved to be strongly dependent on various programming and recovery conditions, a new question that whether Tc is always equal to Td in any thermo-temporal conditions remains to be addressed. In this paper, we answered this question by examining the free recovery profile of an acrylate based amorphous SMP. The recovery Tc, which is the temperature with the maximum recovery speed, versus the recovery temperature is shown to be strongly dependent on both programming and recovery conditions. Their detailed influence could be explained by using the reduced time. During a thermomechanical working cycle of SMPs, in addition to the Td, any other thermo-temporal conditions, such as the holding time (th), cooling rate, recovery heating rate (q), etc., can affect the observed Tc by changing the reduced programming or recovery time. In this manner, the relationship between Tc and Td is not uniquely determined. Besides, the TME in SMPs can only be achieved within a given temperature range. Both onset and offset of this temperature range are shown to be influenced by the programming history, but are independent of the recovery conditions.
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Affiliation(s)
- Kai Yu
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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12
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Lei Y, Zhou S, Zou H, Liang M. Effect of crosslinking density on resilient performance of low-resilience flexible polyurethane foams. POLYM ENG SCI 2014. [DOI: 10.1002/pen.23888] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yanzhou Lei
- State Key Lab of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; 610065 Chengdu People's Republic of China
| | - Shengtai Zhou
- State Key Lab of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; 610065 Chengdu People's Republic of China
| | - Huawei Zou
- State Key Lab of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; 610065 Chengdu People's Republic of China
| | - Mei Liang
- State Key Lab of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; 610065 Chengdu People's Republic of China
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Heuchel M, Sauter T, Kratz K, Lendlein A. Thermally induced shape-memory effects in polymers: Quantification and related modeling approaches. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/polb.23251] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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15
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Synthesis and characterization of shape memory epoxy-anhydride system. JOURNAL OF POLYMER RESEARCH 2013. [DOI: 10.1007/s10965-013-0082-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Koerner H, Strong RJ, Smith ML, Wang DH, Tan LS, Lee KM, White TJ, Vaia RA. Polymer design for high temperature shape memory: Low crosslink density polyimides. POLYMER 2013. [DOI: 10.1016/j.polymer.2012.11.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Ghobadi E, Heuchel M, Kratz K, Lendlein A. Simulating the Shape-Memory Behavior of Amorphous Switching Domains of Poly(L-lactide) by Molecular Dynamics. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201200450] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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20
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Mondal S, Hu JL. Segmented shape memory polyurethane and its water vapor transport properties. Des Monomers Polym 2012. [DOI: 10.1163/156855506778944028] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Zhang Y, Zhang P, Chen X, Wu Z, Wu Q. Tough Thermoplastic Starch Modified with Polyurethane Microparticles: Effects of Molecular Weight of Soft Segments in Polyurethane. Ind Eng Chem Res 2011. [DOI: 10.1021/ie102068v] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu Zhang
- Green Polymer Lab, Polymer Science Department, College of Chemistry, Huazhong Normal University, Luoyu Road 152, Wuhan City, Hubei Province, P. R. China, 430079
| | - Pingping Zhang
- Green Polymer Lab, Polymer Science Department, College of Chemistry, Huazhong Normal University, Luoyu Road 152, Wuhan City, Hubei Province, P. R. China, 430079
| | - Xiaoxia Chen
- Green Polymer Lab, Polymer Science Department, College of Chemistry, Huazhong Normal University, Luoyu Road 152, Wuhan City, Hubei Province, P. R. China, 430079
| | - Zhengshun Wu
- Green Polymer Lab, Polymer Science Department, College of Chemistry, Huazhong Normal University, Luoyu Road 152, Wuhan City, Hubei Province, P. R. China, 430079
| | - Qiangxian Wu
- Green Polymer Lab, Polymer Science Department, College of Chemistry, Huazhong Normal University, Luoyu Road 152, Wuhan City, Hubei Province, P. R. China, 430079
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23
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Bonner M, Montes de Oca H, Brown M, Ward I. A novel approach to predict the recovery time of shape memory polymers. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.01.058] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Rousseau IA, Xie T. Shape memory epoxy: Composition, structure, properties and shape memory performances. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b923394f] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhu Y, Hu J, Yeung K. Effect of soft segment crystallization and hard segment physical crosslink on shape memory function in antibacterial segmented polyurethane ionomers. Acta Biomater 2009; 5:3346-57. [PMID: 19460466 DOI: 10.1016/j.actbio.2009.05.014] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2008] [Revised: 04/15/2009] [Accepted: 05/12/2009] [Indexed: 11/26/2022]
Abstract
Shape memory polyurethane (SMPU) ionomers containing constant 75 wt.% soft segment content were synthesized using poly(epsilon-caprolactone)diol, 4,4'-diphenylmethane diisocyanate, 1,4-butanediol and/or N,N-bis(2-hydroxyethyl)-isonicotinamide. To introduce substrate bonding antibacterial activity, pyridinium was prepared through a neutralization reaction using 1-iodooctane as neutralization agent. For the SMPU ionomer film obtained, tensile testing at 70 degrees C and dynamic mechanical analysis suggests that, at temperatures>T(ms) (the melting point of soft segments), 6.72 and 29.55 mol.% pyridinium within hard segments significantly decreased the mechanical properties such as the stress at 100% elongation (70 degrees C), the initial modulus (70 degrees C) and the elastic modulus (75-110 degrees C). Cyclic tensile investigation demonstrated that the two factors, soft segment crystallization and hard segment physical crosslink, play a very important role in shape memory function in SMPU ionomers. For the each individual specimen, the fixity ratio increased, and the recovery ratio decreased with the extension of cooling time. After sufficient cooling time, the fixity ratio of all specimens can reach a high value (approximately 95%). Owing to the disrupted physical crosslink in the sample containing 29.55 mol.% pyridinium, the crystallization rate of soft segments has less effect on shape fixity. Therefore, a high fixity ratio (93.8%) can be achieved in a short cooling time (30 s). In the control sample, the fixity ratio is only 73.7% after 30 s cooling. In addition, the admirable substrate bonding antibacterial activity of prepared SMPU ionomers was verified using standards AACTT 147 and ASTM E2149 in comparison with the control sample. The antibacterial activity of SMPU ionomers on Gram-positive bacteria (Staphylococcus aureus) is significant, and the rate of reduction of bacteria is 100%; the antibacterial activity on Gram-negative bacteria (Klebsiella pneumoniae) increases from 83.6% to 90.7% with increase in pyridinium content from 6.72 to 29.55 mol.%.
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26
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Shape memory polymer based on chemically cross-linked poly(vinyl alcohol) containing a small number of water molecules. Colloid Polym Sci 2009. [DOI: 10.1007/s00396-009-2117-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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27
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Jimenez GA, Jana SC. Composites of carbon nanofibers and thermoplastic polyurethanes with shape-memory properties prepared by chaotic mixing. POLYM ENG SCI 2009. [DOI: 10.1002/pen.21442] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Oprea S. Structure and properties of cross-linked polyurethane copolymers. ADVANCES IN POLYMER TECHNOLOGY 2009. [DOI: 10.1002/adv.20155] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Wagermaier W, Kratz K, Heuchel M, Lendlein A. Characterization Methods for Shape-Memory Polymers. SHAPE-MEMORY POLYMERS 2009. [DOI: 10.1007/12_2009_25] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Zhu Y, Hu J, Liu Y. Shape memory effect of thermoplastic segmented polyurethanes with self-complementary quadruple hydrogen bonding in soft segments. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2009; 28:3-10. [PMID: 19184151 DOI: 10.1140/epje/i2008-10395-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Revised: 08/21/2008] [Accepted: 11/17/2008] [Indexed: 05/27/2023]
Abstract
This paper describes the fact that a kind of thermoplastic shape memory polyurethane with self-complementary quadruple hydrogen bonding units in soft segments can present a significant shape memory effect under the usually used thermodynamic programming condition. Compared with the control sample, it was observed that the introduction of self-complementary quadruple hydrogen bonding into soft segments increases the glass transition temperature from 28.3 degrees C to 73.3 degrees C. Therefore, the temporary deformation can be fixed well after cooling at room temperature; subsequently thermal responsive shape memory recovery can be triggered by heating up to 86 degrees C. The immediate shape recovery ratio and shape fixity ratio can be 95.8% and 95.9%. Even after 24 hours relaxation for the stretched films, the corresponding R(r) and R(f) can be 94% and 60%. In contrast, the sample without quadruple hydrogen bonding shows that the elasticity and the deformation cannot be fixed after 24 hours relaxation.
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Affiliation(s)
- Yong Zhu
- Institute of Textiles and Clothing, Hong Kong Polytechnic University, Kowloon, Hong Kong, PRC
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31
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Rousseau IA. Challenges of shape memory polymers: A review of the progress toward overcoming SMP's limitations. POLYM ENG SCI 2008. [DOI: 10.1002/pen.21213] [Citation(s) in RCA: 323] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Merline JD, Reghunadhan Nair CP, Ninan KN. Synthesis, Characterization, Curing and Shape Memory Properties of Epoxy‐Polyether System. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2008. [DOI: 10.1080/10601320701864245] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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Cao Q, Chen S, Hu J, Liu P. Study on the liquefied-MDI-based shape memory polyurethanes. J Appl Polym Sci 2007. [DOI: 10.1002/app.25997] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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34
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Wang W, Ping P, Chen X, Jing X. Biodegradable polyurethane based on random copolymer ofL-lactide and ε-caprolactone and its shape-memory property. J Appl Polym Sci 2007. [DOI: 10.1002/app.26039] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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35
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Wang W, Ping P, Chen X, Jing X. Shape memory effect of poly(L-lactide)- based polyurethanes with different hard segments. POLYM INT 2007. [DOI: 10.1002/pi.2204] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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37
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Merline JD, Nair CPR, Gouri C, Bandyopadhyay GG, Ninan KN. Polyether polyurethanes: Synthesis, characterization, and thermoresponsive shape memory properties. J Appl Polym Sci 2007. [DOI: 10.1002/app.27555] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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38
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Buckley PR, McKinley GH, Wilson TS, Small W, Benett WJ, Bearinger JP, McElfresh MW, Maitland DJ. Inductively heated shape memory polymer for the magnetic actuation of medical devices. IEEE Trans Biomed Eng 2006; 53:2075-83. [PMID: 17019872 DOI: 10.1109/tbme.2006.877113] [Citation(s) in RCA: 272] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Presently, there is interest in making medical devices such as expandable stents and intravascular microactuators from shape memory polymer (SMP). One of the key challenges in realizing SMP medical devices is the implementation of a safe and effective method of thermally actuating various device geometries in vivo. A novel scheme of actuation by Curie-thermoregulated inductive heating is presented. Prototype medical devices made from SMP loaded with nickel zinc ferrite ferromagnetic particles were actuated in air by applying an alternating magnetic field to induce heating. Dynamic mechanical thermal analysis was performed on both the particle-loaded and neat SMP materials to assess the impact of the ferrite particles on the mechanical properties of the samples. Calorimetry was used to quantify the rate of heat generation as a function of particle size and volumetric loading of ferrite particles in the SMP. These tests demonstrated the feasibility of SMP actuation by inductive heating. Rapid and uniform heating was achieved in complex device geometries and particle loading up to 10% volume content did not interfere with the shape recovery of the SMP.
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39
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Cao Q, Liu P. Structure and Mechanical Properties of Shape Memory Polyurethane Based on Hyperbranched Polyesters. Polym Bull (Berl) 2006. [DOI: 10.1007/s00289-006-0650-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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40
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Liu G, Guan C, Xia H, Guo F, Ding X, Peng Y. Novel Shape-Memory Polymer Based on Hydrogen Bonding. Macromol Rapid Commun 2006. [DOI: 10.1002/marc.200600189] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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41
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Cao Q, Cai Y, Jing B, Liu P. Structure and mechanical properties of thermoplastic polyurethane, based on hyperbranched polyesters. J Appl Polym Sci 2006. [DOI: 10.1002/app.24779] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Chen S, Cao Q, Jing B, Cai Y, Liu P, Hu J. Effect of microphase-separation promoters on the shape-memory behavior of polyurethane. J Appl Polym Sci 2006. [DOI: 10.1002/app.24754] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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43
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Zhu Y, Hu J, Yeung KW, Choi KF, Liu Y, Liem H. Effect of cationic group content on shape memory effect in segmented polyurethane cationomer. J Appl Polym Sci 2006. [DOI: 10.1002/app.24820] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ping P, Wang W, Chen X, Jing X. Poly(epsilon-caprolactone) polyurethane and its shape-memory property. Biomacromolecules 2005; 6:587-92. [PMID: 15762617 DOI: 10.1021/bm049477j] [Citation(s) in RCA: 204] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of segmented poly(epsilon-caprolactone) polyurethanes (PCLUs) were prepared from poly(epsilon-caprolactone) (PCL) diol, 2,4-toluene diisocyanate and ethylene glycol. The molecular weight (M(n)) of PCL was 500-10,000, and the soft-to-hard molar ratio was 1:2 to 1:6. Their shape-memory behaviors were investigated as a function of PCL molecular weight, PCLU composition, and thermal/mechanical history. When a deformation temperature 15-20 degrees C below T(m) was chosen, the lowest recovery temperature (LRT) was 15-18 degrees C below T(m), and the recovery ratio was 94-100% for tensile deformation of 300% and for compression of 2.7-fold. The reasons for this deformation-recovery procedure and the mechanism for this shape recovery below T(m) were discussed. The shape recovery was associated with the premelting of the crystals formed during the deformation and fixation, and, thus, it could be accomplished in the solid state. Its driving force was the inner stress stored in the deformed specimen during deformation and crystallization. Therefore, the LRT was a more practical temperature for shape-memory PCLU than T(m). It could be conveniently measured by means of thermal mechanical analysis. By adjusting the molecular weight of the PCL diol and the hard-to-soft ratio, the LRT of PCLU could be adjusted to the range of 37-42 degrees C, and reasonable rigidity could be retained after shape recovery, fulfilling the essential requirements of medical implantations.
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Affiliation(s)
- Peng Ping
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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Liu G, Ding X, Cao Y, Zheng Z, Peng Y. Novel Shape-Memory Polymer with Two Transition Temperatures. Macromol Rapid Commun 2005. [DOI: 10.1002/marc.200400640] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Liu G, Ding X, Cao Y, Zheng Z, Peng Y. Shape Memory of Hydrogen-Bonded Polymer Network/Poly(ethylene glycol) Complexes. Macromolecules 2004. [DOI: 10.1021/ma035717w] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guoqin Liu
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Xiaobing Ding
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Yiping Cao
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Zhaohui Zheng
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Yuxing Peng
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
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Zhu G, Liang G, Xu Q, Yu Q. Shape-memory effects of radiation crosslinked poly(?-caprolactone). J Appl Polym Sci 2003. [DOI: 10.1002/app.12736] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Li F, Larock RC. New soybean oil-styrene-divinylbenzene thermosetting copolymers. v. shape memory effect. J Appl Polym Sci 2002. [DOI: 10.1002/app.10493] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Cao Y, Guan Y, Du J, Luo J, Peng Y, Yip CW, Chan ASC. Hydrogen-bonded polymer network—poly(ethylene glycol) complexes with shape memory effect. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b207024n] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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