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High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment
Institute of Renewable Energy and Environment Technology, University of Bolton, Bolton BL3 5AB, UK
Department of Mechanical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
Thin Film Centre, University of West of Scotland, Paisley PA1 2BE, UK
* Author to whom correspondence should be addressed.
Received: 18 April 2012; in revised form: 22 May 2012 / Accepted: 23 May 2012 / Published: 31 May 2012
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.
Keywords: thermal-responsive SMPUs; polyurethanes; high molecular weight; low recovery stress
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Ahmad, M.; Xu, B.; Purnawali, H.; Fu, Y.; Huang, W.; Miraftab, M.; Luo, J. High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment. Appl. Sci. 2012, 2, 535-548.
Ahmad M, Xu B, Purnawali H, Fu Y, Huang W, Miraftab M, Luo J. High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment. Applied Sciences. 2012; 2(2):535-548.
Ahmad, Manzoor; Xu, Bin; Purnawali, Hendra; Fu, Yongqing; Huang, Weimin; Miraftab, Mohsen; Luo, Jikui. 2012. "High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment." Appl. Sci. 2, no. 2: 535-548.