High molecular weight soft segment based polyethylene shape memory polymers

Ahmad, Manzoor, Luo, Jikui, Xu, Ben, Purnawali, Hendra, King, Peter, Chalker, Paul, Fu, Yong Qing, Huang, Wei Min and Miraftab, Mohsen (2012) High molecular weight soft segment based polyethylene shape memory polymers. World Journal of Engineering, 9 (3). pp. 179-186. ISSN 1708-5284

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Abstract

Shape memory polyurethanes (SMPUs) are typically synthesized using polyols of low molecular weight, Mw, and high hydroxyl number as it is believed that high density of cross-links in these polyols are essential for high performance shape memory polymers. In this study, polyethylene glycol (PEG-6000) with Mw ~ 6000 g/mol and low hydroxyl number (OH ~ 18 mg K OH/g) as the soft segment and diisocyanate as the hard segment were used to synthesize SMPUs. It revealed that although the PEG-6000 based SMPUs have lower maximum elongation at break (425%) and recovery stress than those of PCL-2000 polyol based SMPUs, they have much better shape recovery ratio (98%) and shape fixity (95%). Furthermore, these SMPUs showed a much shorter actuation time of <10sec for up to 85% shape recovery, much shorter than those low Mw SMPUs, clearly demonstrated their great potential for applications.

Item Type:	Article
Uncontrolled Keywords:	Shape memory, actuation, cross-links
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 13:17
Last Modified:	13 Oct 2019 00:32
URI:	http://nrl.northumbria.ac.uk/id/eprint/12786

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