Novel moisture-sensitive shape memory polyurethanes containing pyridine moieties |
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Authors: | Shaojun Chen Jinlian Hu Chun-wah Yuen Laikuen Chan |
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Affiliation: | aInstitute of Textiles and Clothing, Hong Kong Polytechnic University, Hung Hom, Hong Kong, China |
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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. |
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Keywords: | Shape memory Polymer Supramolecular structure |
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