High performance shape memory polyurethane synthesized with high molecular weight polyol as the soft segment

Ahmad, Manzoor, Xu, Ben, Purnawali, Hendra, Fu, Yong Qing, Huang, Wei Min, Miraftab, Mohsen and Luo, Jikui (2012) High performance shape memory polyurethane synthesized with high molecular weight polyol as the soft segment. Applied Sciences, 2 (2). pp. 535-548. ISSN 2076-3417

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Official URL: http://dx.doi.org/10.3390/app2020535

Abstract

Shape memory polyurethanes (SMPUs) are typically synthesized using polyols of low molecular weight (MW~2,000 g/mol) as it is believed that the high density of cross-links in these low molecular weight polyols are essential for high mechanical strength and good shape memory effect. In this study, polyethylene glycol (PEG-6000) with MW ~6000 g/mol as the soft segment and diisocyanate as the hard segment were used to synthesize SMPUs, and the results were compared with the SMPUs with polycaprolactone PCL-2000. The study revealed that although the PEG-6000-based SMPUs have lower maximum elongations at break (425%) and recovery stresses than those of PCL-based SMPUs, they have much better recovery ratios (up to 98%) and shape fixity (up to 95%), hence better shape memory effect. Furthermore, PEG-based SMPUs showed a much shorter actuation time of < 10 s for up to 90% shape recovery compared to typical actuation times of tens of seconds to a few minutes for common SMPUs, demonstrated their great potential for applications in microsystems and other engineering components.

Item Type: Article
Uncontrolled Keywords: thermal-responsive SMPUs, polyurethanes, high molecular weight, low recovery stress
Subjects: F100 Chemistry
F200 Materials Science
H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Bin Xu
Date Deposited: 06 Jun 2013 13:35
Last Modified: 29 Jan 2016 23:04
URI: http://nrl.northumbria.ac.uk/id/eprint/12787

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