NDLI: Effect of hard segment architecture on shape memory properties of polycaprolactone-based polyurethane containing azobenzene

Content Provider	Springer Nature Link
Author	Wu, Xiwen Liu, Libin Fang, Wenyuan Qiao, Congde Li, Tianduo
Copyright Year	2015
Abstract	In this work, we synthesized two kinds of polyurethanes with azobenzene as hard segments in the side chains and in the main chains. Their thermal stabilities were high enough for their shape memory application. For polyurethane with azobenzene in the side chain (PU), the azobenzene has more distinctly effect on inhibiting crystallization of polycaprolactone (PCL) because of irregular orientation of azobenzene. For polyurethane with azobenzene in the main chain (PUR), the crystallinity of PCL is mainly affected by its molecular weight. PU-3500 and PUR-3500 exhibit perfect shape fixing ability of 99 % with recovery ratio of 98 % at 50 % strain. The recovery ratio is decreased for PU-3500 and increased for PUR-3500 as the applied strain increased. The mechanism of the hard segment structures effect on the shape memory behavior is briefly discussed. Importantly, the two molecules behave trans–cis isomerization under UV irradiation. This work is crucially important for the structural design of shape memory polyurethane and applications in the smart devices.
Starting Page	2727
Ending Page	2738
Page Count	12
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	51
Issue Number	5
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2015-11-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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