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以2-溴代异丁酸乙酯为引发剂,Cu Br/PMDETA为催化体系,通过原子转移自由基聚合(ATRP)方法,合成了寡聚乙二醇甲基丙烯酸酯与丙烯酸叔丁酯的嵌段共聚物(PMEO2MA-b-Pt BA);通过水解脱去共聚物中丙烯酸叔丁酯嵌段上的叔丁基,使丙烯酸叔丁酯嵌段转化为丙烯酸嵌段,得到寡聚乙二醇甲基丙烯酸酯与丙烯酸的嵌段共聚物(PMEO2MA-b-PAA).通过溶液透光率和动态光散射(DLS)等方法,表征了合成得到的嵌段共聚物的温敏性能和p H响应性,发现嵌段共聚物在24~30℃,p H=4~8的范围内发生亲水性性质转变.以二环己基碳二亚胺(DCC)为缩合剂,在4-二甲氨基吡啶(DMAP)的催化下使PMEO2MA-b-PAA上的羧基与蚕丝上的氨基发生缩合反应,从而令共聚物接枝到蚕丝上,通过接触角和回潮率的测试发现改性后的蚕丝在28~42℃具温敏性,较共聚物的转变温度有所升高,其转变温度随p H的增大而上升.
Using 2-bromoisobutyrate as initiator and Cu Br / PMDETA as catalyst system, oligoethylene glycol methacrylate and t-butyl acrylate were synthesized by atom transfer radical polymerization (ATRP) Block copolymer (PMEO2MA-b-Pt BA); by removing the tert-butyl acrylate block in the copolymer, the tert-butyl acrylate block is converted into an acrylic block, (PMEO2MA-b-PAA) was synthesized by means of the method of solution light transmittance and dynamic light scattering (DLS). The thermal sensitivity of the synthesized block copolymer and the p H, the block copolymer was found to undergo a hydrophilic property transition at a temperature in the range of 24-30 ° C with a p H = 4 to 8. With dicyclohexylcarbodiimide (DCC) as a condensing agent, Under the catalysis of methylaminopyridine (DMAP), the carboxyl groups on PMEO2MA-b-PAA were condensed with the amino groups on the silk to make the copolymer grafted on the silk. Through the test of contact angle and moisture regain, the modified Silk at 28 ~ 42 ℃ with temperature-sensitive, higher than the transition temperature of the copolymer, the transition temperature increases with p H increases.