光-温度双重响应凝胶的制备及温敏性能研究

摘要

A dual responsive hydrogels of poly(N-isopropylacrylamide-co-acrylamido azobenzene)(P(NIPAAmco-AAAB)) was prepared via a free-radical copolymerization route with N-isopropylacrylamide (NIPAAm) and acrylamido azobenzene (AAAB) which contains of azobenzene groups and the thermoresponse behaviors were studied. The results disclosed that the P(NIPAAm-co-AAAB) hydrogels has temperature-sensitivity and the thermoresponsive behaviors was reversible and affected by the molar ratio of AAAB to NIPAAm. With the increase of the molar ratio,the LCST of the dual responsive hydrogels decreased. Compared with PNIPAAm hydrogels, the swelling ratio of the P(NIPAAm-co-AAAB) hydrogel decreased and with the molar ratio increased,the swelling ratio and deswelling speed decreased too.%采用自由基共聚合方法,将丙烯酰胺基偶氮苯(AAAB)与N-异丙基丙烯酰胺(NIPAAm)共聚,制备了一种具有温度和紫外光双重响应性的P(NIPAAm-co-AAAB)共聚凝胶,并研究了凝胶的温敏性.研究结果表明,P(NIPAAm-co-AAAB)凝胶具有温度响应性,且溶胀和退溶胀性能较好.与PNIPAAm凝胶相比,共聚凝胶平衡溶胀率降低.随共聚配比中AAAB含量的增大,共聚凝胶的低临界溶解温度(LCST)、平衡溶胀率和退溶胀速率均逐渐降低.