摘要
研究了在咪唑基二硫代甲酸苄酯存在下 6 0 Coγ射线 ( 5 2 .5 Gy/min)辐照丙烯酸甲酯单体的自由基聚合行为 .分别用 GPC和 1 H NMR对聚合物分子量及分布和聚合物结构进行了表征 .结果表明 ,该聚合体系呈现活性自由基聚合的特征 ,即聚合物分子量随单体转化率呈线性增长 ,分子量分布较窄 ,ln( [M]0 /[M])和聚合时间之间存在线性关系 .与其它活性自由基聚合体系相比 ,本体系的聚合速度非常快 ,聚合到 68min时聚合物分子量即可达到 3 960 0 g/mol(转化率 68% ,Mw/Mn=1 .0 8)
The free radical polymerization of vinyl monomers under 60Co γ-ray irradiation(52.5 Gy/min) in the presence of benzyl 1H-imidazole-1-carbodithioate(BICDT) was studied. The polymers were characterized by GPC and 1H NMR. The results show that the molecular weight increases linearly with the increase of the monomer conversion, the molecular weight distribution(MWD) is narrow and a linear relationship between ln([M] 0/[M]) and polymerization time exists. All of these evidences indicate that the polymerization of MA is a living free radical polymerization. It is worthy to be noticed that the polymerization of methyl acrylate(MA) is quite fast, molecular weight(M w) is as large as 39 600 g/mol at 68% conversion with M w/M n=1.08 within 68 min.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第10期1945-1948,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :2 0 2 740 43 )资助
