甲基丙烯酸甲酯和联苯酯的基团转移共聚研究

GROUP TRANSFER COPOLYMERIZATION OF MMA AND BPMA

研究了甲基丙烯酸甲酯（ＭＭＡ）和甲基丙烯酸联苯酯（ＢＰＭＡ）的基团转移共聚．用１ＨＮＭＲ、ＩＲ、ＧＰＣ和ＤＳＣ等手段对共聚物进行了表征．测得两种单体在苯、四氢呋喃和乙腈中的竞聚率（３０℃）分别为γ１＝０５６±００３、０５２±００３、０４６±００３和γ２＝０７９±００３、０８１±００３、０８５±００３．得到了实测分子量和理论分子量相近。

Methyl methacrylate(MMA)was statistically copolymerized with biphenyl methacrylate(BPMA)via group transfer polymerization.The copolymer composition was measured by 1H NMR,the thermal behaviour of these copolymer was determined by DSC.The reactivity ratios were γ 1 =0.56±0.03,0.52±0.03,0.46±0.03 and γ 2 =0.79±0 03,0.81±0.03,0.85±0.03 in benzene,tetrahydrofuran and acetonitrile respectively at 30℃.Copolymers with narrow molecular weight distribution and predetermined molecular weight were obtained.