Journal
POLYMER
Volume 50, Issue 19, Pages 4424-4428Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.07.031
Keywords
Shape memory; Polymer; Supramolecular structure
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Funding
- Hong Kong Polytechnic University
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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 (T-g) below ambient temperature without external heating. (C) 2009 Elsevier Ltd. All rights reserved.
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