温度/pH敏感性嵌段共聚物P（HEMA-co-DEAEMA）-b-PDEAM-b-P（DEAEMA-co-HEMA）的合成与性质研究

摘要

利用原子转移自由基聚合方法（ATRP）合成了组成递变的嵌段共聚物P（HEMA-co-DEAEMA）-b-PDEAM-b-P（DEAEMA-co-HEMA）.用FTIR,1H NMR和GPC技术表征了聚合物的组成、结构、分子量及其分布.通过透光率测定、粘度、激光粒度分析和透射电镜研究了共聚物组成、温度及溶液pH对其溶液相行为和胶束化作用的影响.结果表明：所合成的嵌段共聚物具有温度和pH敏感性,共聚物水溶液的低临界溶解温度（LCST）随HEMA量的增加而降低,临界相变pH随HEMA量的增加而降低,温度和pH诱%ABA type triblock compolymers poly（2-hydroxyethyl methacrylate-co-2-N,N-diethylamino ethyl methacrylate）-b-poly（N,N-diehylacryamide）-b-poly（2-hydroxyethyl methacrylate-co-2-N,N-diethylamino ethyl methacrylate） [P（HEMA-co-DEAEMA）-b-PDEAM-b-P（DEAEMA-co-HEMA）] were synthesized via atom transfer radical polymerization（ATRP）.The synthesized triblock copolymers were characterized by FT-IR,1H NMR and GPC techniques.The temperature and pH sensitivities of the triblock copolymer aque-ous solutions were investigated by transmittance measurements,viscosity,laser particle size analysis and transmission electron microscope.The results show that the resultant block copolymers have temperature and pH sensitivities,the lower critical solution temperature（LCST） of the copolymers decreases with in-creasing of the HEMA content in the triblock copolymers,and the critical phase transition pH of the triblock copolymer solutions also decreses with increasing of the HEMA content in the copolymers.The micelliza-tion of triblock copolymers can be realized by changing of temperature or pH.The LCST and pKa of the block copolymers can be adjusted by controlling HEMA content in the copolymers.