甲基丙烯酸酯嵌段共聚物的合成与表征

SYNTHESIS AND CHARACTERIZATION OF BLOCKCOPOLYMERIZATION OF METHACRYLATE

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］＝５．０～５．４×１０－２ｍｏｌ／Ｌ，Ｍｎ（ＰＣ７～９ＭＡ－）＜１．６×１０４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.