甲基丙烯酸酯嵌段共聚物的合成与表征

Abstract

研究了MMA和C7~9MA的阴离子共聚合，得到了A-b型嵌段共聚物。讨论了嵌段顺序、温度、引发剂及PC7~9MA-活性链长对MMA嵌段共聚的影响，认为，当第一嵌段单体为C7~9MA，T＝-20℃，［I］＝5.0~5.4x10-2MOl/l，Mn（PC7~9MA-）＜1.6x104时，有利于PC7~9MA-b-PMMA嵌段共聚物的合成；采用gPC、Ir、nMr对所得嵌段共聚物进行了表征。

The anionic block copolymerization MMA and C7￣9Methacrylate(C7￣9MA) was studied using nBuLi as initiator.PC7￣9MAbPMMA copolymer was obtained.The inFluence of monomer sequence, temperature, initiator and active chain length of PC7￣9MA- were discussed on block copolymerization.When T=-20 ℃,=0.50￣0.54×10-2 mol/L, C7￣9MA as First monomer, PC7￣9MA- with  n￣ 1.6×104 was Favorable to the synthesis of PC7￣9MA bPMMA block copolymer.The molecular weight and molecular weight distribution of copolymer were measured by GPC.The structure of block copolymer was characterized by FTIR and 1HNMR.