https://doi.org/10.1140/epje/i2008-10395-2
Regular Article
Shape memory effect of thermoplastic segmented polyurethanes with self-complementary quadruple hydrogen bonding in soft segments
Institute of Textiles and Clothing, Hong Kong Polytechnic University, Kowloon, Hong Kong, PRC
* e-mail: tchujl@inet.polyu.edu.hk
Received:
18
March
2008
Revised:
21
August
2008
Accepted:
17
November
2008
Published online:
14
January
2009
This paper describes the fact that a kind of thermoplastic shape memory polyurethane with self-complementary quadruple hydrogen bonding units in soft segments can present a significant shape memory effect under the usually used thermodynamic programming condition. Compared with the control sample, it was observed that the introduction of self-complementary quadruple hydrogen bonding into soft segments increases the glass transition temperature from 28.3 ° C to 73.3 ° C. Therefore, the temporary deformation can be fixed well after cooling at room temperature; subsequently thermal responsive shape memory recovery can be triggered by heating up to 86 ° C. The immediate shape recovery ratio and shape fixity ratio can be 95.8% and 95.9%. Even after 24 hours relaxation for the stretched films, the corresponding Rr and Rf can be 94% and 60%. In contrast, the sample without quadruple hydrogen bonding shows that the elasticity and the deformation cannot be fixed after 24 hours relaxation.
PACS: 61.41.+e Polymers, elastomers, and plastics – / 62.20.-x Mechanical properties of solids – / 64.70.-p Specific phase transitions –
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2009