【摘要】 以N-乙烯基吡咯烷酮和丙烯酸-2-羟基乙酯为共聚单体,采用自由基聚合的方法,合成了N-乙烯基吡咯烷酮/丙烯酸-2-羟基乙酯共聚物P(NVPc-o-HEA),通过肉桂酰化的修饰,共聚物不仅在水溶液中具有温度敏感性,而且还具有光活性。对肉桂酰化的P(NVP-co-HEA)性能研究的结果表明,酰化度小于5%时,其水溶液仍没有低临界溶解温度(LCST)出现;当酰化度为10%、15%、20%和25%时的LCST分别为55、50、45和36℃,表现出较好的温度敏感性;当酰化度达到30%时,聚合物水溶液在室温(23℃)下就发生明显的胶束现象,溶液呈半透明蓝色,达到35%时,聚合物不再溶解。聚合物涂层经紫外光辐照后发生交联而形成不溶于水却能在水中溶胀的温敏性水凝胶。更多还原

【Abstract】 The photocrosslinkable copolymers, poly(N-vinyl pyrrolidone-2-hydropropyl acrylate)(P(NVP-co-HEA)), were synthesized from N-vinyl pyrrolidone and 2-hydropropyl acrylate via radical copolymerization. After cinnamoylation, the copolymers were not only temperature sensitive in aqueous (solution), but also photoactive. The properties of the cinnamoylated P(NVP-co-HEA) were studied. The results show that the low (critical) solution temperature(LCST) of cinnamoylated P(NVP-co-HEA) was 55,50,45,36 at degree of cinnamoylation of 10%, 15%, 20%, 25% in aqueous solution, respectively. At 30% cinnamoylation the (aqueous) (solution) of the copolymer was blue translucent due to micellization, and at 35% cinnamoylation the copolymer became insoluble in water. A film of cinnamoylated P(NVP-co-HEA) crosslinks and becomes (insoluble) under the irradiation of UV light, but it swells in water and becomes a hydrogel.更多还原