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The effects of crosslink density on thermo-mechanical properties of shape-memory hydro-epoxy resin

Published online by Cambridge University Press:  22 October 2013

Kun Wei ,
Guangming Zhu ,
Yusheng Tang ,
Tingting Liu  and
Jianqiang Xie
Kun Wei*
Affiliation:
School of Science, Northwestern Polytechnical University, Xi'an 710129, China; and Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, China
Guangming Zhu*
Affiliation:
School of Science, Northwestern Polytechnical University, Xi'an 710129, China
Yusheng Tang
Affiliation:
School of Science, Northwestern Polytechnical University, Xi'an 710129, China
Tingting Liu
Affiliation:
School of Science, Northwestern Polytechnical University, Xi'an 710129, China
Jianqiang Xie
Affiliation:
School of Science, Northwestern Polytechnical University, Xi'an 710129, China
*
a)Address all correspondence to these authors. e-mail: weikun@mail.nwpu.edu.cn
b)e-mail: gmzhu@nwpu.edu.cn
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Abstract

The objective of this work is to reveal the relationship between the molecular structure and shape-memory property of a hydro-epoxy resin system. The system is prepared using hydro-epoxy, menthane diamine (MDA), and poly(propylene glycol) diglycidyl ether (PPGDGE) with different molecular weights. By keeping the PPGDGE content constant, the crosslink density of the shape-memory hydro-epoxy resin system can be changed by varying the molecular weight of PPGDGE. The results indicate that the glass transition temperature (Tg) and rubber modulus (Er) decrease as the crosslink density decreases. The crosslink density has little influence on shape recovery ratio (Rr). Full recovery can be observed after only several minutes when the temperature is equal to or above Tg. However, the crosslink density has a profound effect on the shape fixity ratio (Rf). If the crosslink density is too low, the shape fixity ratio of shape-memory hydro-epoxy resin would not reach 100%.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 20 , 28 October 2013 , pp. 2903 - 2910
Copyright
Copyright © Materials Research Society 2013 

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