多嵌段共聚物PGMA-PBMA-PDMS-PBMA-PGMA的ATRP合成与表征

Synthesis and Characterization Multi-Block Copolymer PGMA-PBMA-PDMS-PBMAPGMA by ATRP

采用聚二甲基硅氧烷大分子(Br-PDMS-Br)为引发剂,CuCl为催化剂,2,2’-联吡啶(bpy)为配体,甲基丙烯酸丁酯(BMA)和甲基丙烯酸缩水甘油酯(GMA)为单体,通过原子转移自由基聚合(ATRP)法,合成含有反应性环氧基的多嵌段共聚物PGMA-PBMA-PDMS-PBMA-PGMA。利用凝胶渗透色谱(GPC)、红外光谱(IR)、核磁共振(1H-NMR)、原子力显微镜(AFM)和热重分析(TG)方法对其分子量、分子结构、相形态及热稳定性进行研究。研究表明,多嵌段共聚物分子量可控,多分散性低(PDI=1.14～1.40);在微观相上形成有序纳米结构,粒径大小100 nm～2μm;多嵌段聚合物低分解温度为270℃,高分解温度为480℃,具有良好的热稳定性;由于引入反应性基团环氧基,大大扩大了其应用范围。

In this paper, multi-block copolymer PGMA-PBMA-PDMS-PBMA-PGMA containing reactivity epoxy group was prepared by atom transfer radical polymerization （ATRP） method. The copolymer is synthesized by using polydimethylsiloxane molecules （Br-PDMS-Br） ended with functional groups as an initiator, cuprous chloride （CuC1） as a catalyst, 2,2＇- bipyridine （bpy） as a ligand, rnethacrylate butyl ester （BMA） and glycidyl methacrylate （GMA） as monomers. Its molecular weight, molecular structure, morphology and thermal stability were identified by gel permeation chromatography （GPC）, Fourier transform infrared spectroscopy （FT-IR）, （hydrogen） nuclear magnetic resonance （1H-NMR）, atomic force microscopy （AFM） and thermal gravimetric analysis （TG）. The results show that molecular weight of the multi-block copolymer can be well controlled, polydispersity of the polymer is as low as 1.14 to 1.40. Microphase ordered nanostrueture is formed of which the particle size is 100 nm--2μm. Compatibility of the components and thermal stability of the multipolymer are great. Low decomposition temperature is 270 ℃, high decomposition temperature is 480 ℃.