苯乙烯与富马酸二甲酯的原子转移自由基无规共聚

Atom transfer radical copolymerization of dimethyl fumarate with styrene

2 溴丙酸乙酯(EBP)为引发剂,CuBr为催化剂,N,N,N′,N″,N″ 五甲基二亚乙基三胺(PMDETA)为配位剂的富马酸二甲酯(DMF)与苯乙烯(St)的原子转移自由基无规共聚合,转化率低于60%时,1n([M]0/[M])随聚合时间线性增加,数均分子量(Mn)随转化率性增长,所得聚合物分子量分布(PDI)较窄。根据元素分析所得共聚物的平均组成,由Kelen—Tudos方程,计算两种共聚单体的竞聚率分别是rst=0.488,rDMF=0.303。并探讨了单体与引发剂配比以及温度对聚合反应的影响。

Atom transfer radical copolymerization of St and DMFusing EBP as inintiator,CuBr/N,N,N′,N″,N″-pentanethyldiethylenetriamine (PMDETA)as a catalust system was carried out successfully. The results showed that when conversion below 60%,ln([M]_0/[M])had a good linear relationship with time ,number-average molecular weight (Mn) increased with monomer conversion linearly. Polydispersity index of the copolymer remained low (PDI<1.2).According to the composition of the copolymer obtained by elemental analysis,reactivity ratios of two monomers (r_(St)=0.488,r_(DMF)=0.303)were calculated by the Kelen—Tüdos equation.