以可光交联胶束为模板的银纳米粒子的制备

摘要

采用原子转移自由基聚合及侧链化学修饰的方法,合成丙烯酸(AA)、丙烯酸-2-肉桂酰氧基乙酯(CEA)与丙烯酸正丁酯(nBA)的两亲性共聚物PAA-b-(PnBA-co-PCEA).PAA-b-(PnBA-co-PCEA)在选择性溶剂中自组装,形成以PCEA与PnBA链段为核、PAA链段为壳的球形胶束;胶束核内的肉桂酰基由紫外光引发光交联反应,得到结构稳定的胶束;以其为模板,硼氢化钠为还原剂,制备银(Ag)/胶束复合纳米粒子;使用X射线衍射、透射电子显微镜、傅立叶变换红外光谱、紫外吸收光谱等方法对制得的Ag纳米粒子进行了表征.结果表明,所得Ag纳米粒子为面心立方结构,其与胶束壳层中的羧基发生了结合;Ag/胶束复合纳米粒子的平均直径为12 nm,分散性较好,可作为导电填料用于制备聚合物基导电复合材料.%Amphiphilic copolymer poly (acrylic acid) -b-poly (n-butyl acrylate) -co-poly (2-cinnamoyloxy ethyl acrylate) [PAA-b- (PnBA-co-PCEA ) ] was synthesized by atom transfer radical polymerization and chemical modification of side chain. PAA-b- (PnBA-co-PCEA) could self-assemble in selective solutions to form spherical micelles with PCEA and PnBA chains as the core, and PAA chains as the shell. The spherical micelles with stable structure were gained through photo cross-linking reaction of PCEA functional groups initiated by UV. Ag/micelle nanoparticles was synthesized by using the micelles as template and NaBH4 as reducing agent. The nanoparticles was characterized by XRD, TEM, FTIR, UV spectrum etc.. The results showed that the prepared silver nanoparticles had face-centered cubic structure and were combined with carboxyl groups in the shell of micelle, the average diameter of Ag/ micelle nanoparticles was 12 nm and the dispersion of the nanoparticles was better, so the nanoparticles could be used for preparing ploymer conductive composites as a kinds of conductive filler.