高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (10): 1945.

• 研究论文 • 上一篇    下一篇

咪唑基二硫代甲酸苄酯存在下60Coγ射线辐照丙烯酸甲酯的快速活性自由基聚合

华道本, 白如科, 陆伟琪, 潘才元   

  1. 中国科学技术大学高分子科学与工程系, 合肥230026
  • 收稿日期:2003-07-29 出版日期:2004-10-24 发布日期:2004-10-24
  • 基金资助:

    国家自然科学基金(批准号:20274043)资助

Rapid Living Free-Radical Polymerization of Methyl Acrylate Under 60Co γ-ray Irradiation in the Presence of Benzyl 1H-Imidazole-1-Carbodithioate

HUA Dao-Ben, BAI Ru-Ke, LU Wei-Qi, PAN Cai-Yuan   

  1. Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
  • Received:2003-07-29 Online:2004-10-24 Published:2004-10-24

摘要: 研究了在咪唑基二硫代甲酸苄酯存在下60Coγ射线(52.5Gy/min)辐照丙烯酸甲酯单体的自由基聚合行为.分别用GPC和1HNMR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39600g/mol(转化率68%,Mw/ Mn=1.08).

关键词: 咪唑基二硫代甲酸苄酯, 快速活性自由基聚合, &gamma, 射线辐照

Abstract: The free radical polymerization of vinyl monomers under 60Coγ-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 Mw/ Mn=1.08 within 68 min.

Key words: Benzyl 1H-imidazole-1-carbodithioate, Rapid living free radical polymerization, γ-ray irradiation

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