Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30864
Title: Novel moisture-sensitive shape memory polyurethanes containing pyridine moieties
Authors: Chen, S
Hu, J 
Yuen, CWM
Chan, L
Keywords: Polymer
Shape memory
Supramolecular structure
Issue Date: 2009
Publisher: Elsevier
Source: Polymer, 2009, v. 50, no. 19, p. 4424-4428 How to cite?
Journal: Polymer (United Kingdom) 
Abstract: In this communication, novel moisture-sensitive shape memory polyurethane (SMPU) was synthesized from 1,6-hexamethylene diisocyanate (HDI) and N,N-bis(2-hydroxylethyl) isonicotinamide (BINA) and 1,4-butanediol (BDO). Results show that the BINA based SMPUs have excellent moisture absorption properties which are not only influenced by the temperature, but also by the relative humidity (RH). As a result, high strain recovery with fast recovery speed is obtained after immersion in the moisture condition for a short time. FT-IR spectra provide a proof to the mechanism of moisture-sensitive SME which is based on the dissociation or disrupt of hydrogen bonding in the pyridine ring induced by moisture absorption. Thus, the strain recovery is achieved in the moisture-sensitive SMPUs by decreasing the glass transition temperature (Tg) below ambient temperature without external heating.
URI: http://hdl.handle.net/10397/30864
ISSN: 0032-3861
EISSN: 1873-2291
DOI: 10.1016/j.polymer.2009.07.031
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