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采用原子转移自由基活性聚合(ATRP)的方法,先以苯乙烯(St)为单体,α-溴代异丁酸乙酯(Ei B-Br)为小分子引发剂,Cu Br/PMDETA为催化体系,通过本体聚合制备出大分子引发剂聚苯乙烯(PS-Br)。再以PS-Br为引发剂引发第二单体甲基丙烯酸二甲氨基乙酯(DMAEMA)的本体聚合,得到PS-b-PDMAEMA-Br二嵌段共聚物,接着用PS-b-PDMAEMA-Br分别引发第三单体甲基丙烯酸甲酯(MMA)和甲基丙烯酸叔丁酯(t BMA)的本体聚合,得到三嵌段共聚物PS-b-PDMAEMA-b-Pt BMA,运用GPC、1H-NMR以及FTIR等对三嵌段共聚物进行表征;最后通过酸性水解得到PS-b-PDMAEMA-b-PMAA两亲性嵌段共聚物,并初步探究其表面活性。结果表明所得两亲性三嵌段共聚物具有一定的降低表面张力的能力,但弱于硬脂酸类小分子表面活性剂。
Atom transfer radical polymerization (ATRP) was used as the method. Firstly, styrene (St) was used as a monomer and ethyl α-bromoisobutyrate (Ei B-Br) Catalytic system, macromonomer polystyrene (PS-Br) was prepared by bulk polymerization. PS-b-PDMAEMA-Br diblock copolymer was synthesized with PS-Br as initiator to initiate bulk polymerization of dimethylaminoethyl methacrylate (DMAEMA) Br were used to initiate the bulk polymerization of the third monomer, methyl methacrylate (MMA) and t-butyl methacrylate (t BMA) respectively, to obtain the triblock copolymer PS-b-PDMAEMA-b- 1H-NMR and FTIR. The PS-b-PDMAEMA-b-PMAA amphiphilic block copolymer was finally obtained by acid hydrolysis, and its surface activity was investigated. The results show that the amphiphilic triblock copolymers obtained have a certain ability to reduce the surface tension, but weaker than stearic acid small molecule surfactants.