ATRP法制备纳米铜/PMMA-b-PSt复合粒子及其表征

在超声辐射作用下,以α-溴代丙酸乙酯为引发剂,溴化亚铜/2,2-联吡啶为催化体系,通过原子转移自由基聚合（ATRP）制备了预聚物聚甲基丙烯酸甲酯（PMMA-Br）.以此预聚物为大分子引发剂,苯乙烯为共聚单体进行ATRP反应,合成了PMMA-b-PSt嵌段共聚物.通过硼氢化钠还原聚合物体系中的溴化亚铜,制备得到纳米铜/PMMA-b-PSt复合粒子.采用红外吸收光谱（IR）、核磁共振（1H NMR）、凝胶渗透色谱（GPC）和透射电子显微镜（TEM）等手段对样品进行表征,并用热分析法对样品的热性能进行了研究.实验结果表明成功合成了以PMMA-b-PSt为壳,以纳米铜为核的复合粒子,并发现这种复合粒子可以形成以PMMA-b-PSt为连续相以纳米铜为分散相的圆环状组装图案,热分析结果表明纳米铜粒子的存在降低了嵌段共聚物的分解温度.

Synthesis and characterization of composites by atom transfer nano-copper/PMMA-b-PSt radical polymerization

The poly （methyl methacrylate） with single-caped halogen （PMMA-Br） was synthesized by using atom transfer radical polymerization （ATRP） method under ultrasonic irradiation, with ethyl a-bromopropionate as the initiator and CuBr/2, 2-bipyridine （BPy） as the catalyst and ligand. Then with PM-MA-Br as the macroinitiator and CuBr/BPy as the catalyst and igand, the block copolymer poly （methyl methacrylate）-b-polystyrene was synthesized by ultrasonic. Then nano-copper/ poly （methyl methaery-late）-b-polystyrene composites were successfully prepared whh NaBH4 as reductant in the polymerization system. The composites were characterized by means of IR,1H NMR,GPC and TEM. The testing results of TG showes that the decomposition temperature of nano-copper/poly （methyl methacrylate）-b-polystyrene composites are lower than of poly （methyl methacrylate）-b-polystyrene.