TEMPO存在下丙二腈对苯乙烯聚合的加速作用研究  

MN as a Rate-accelerating Additive for Styrene Polymerization Mediated by TEMPO

作　　者：林建[1] 郑淑英 李万利[1] 颜明发[1] 黄剑莹[1] 林明华[1] 邹友思[1] 

机构地区：[1]厦门大学材料科学系,固体表面物理化学国家重点实验室,厦门361005 [2]福建宁德高等专科学校化学系,宁德352100

出　　处：《高等学校化学学报》2003年第7期1307-1310,共4页Chemical Journal of Chinese Universities

基　　金：固体表面物理化学国家重点实验室基金 (批准号 :1130 )资助

摘　　要：在少量丙二腈存在下 ,苯乙烯在稳定自由基 TEMPO作用下的聚合速率显著增加 ,分子量分布较窄 ,且随转化率增大而增大 ,具有活性聚合特征 .丙二腈与 TEMPO的摩尔比在 4∶ 1时加速效果较好 ,在1 2 5℃下聚合 1 h转化率可达到 70 % ,分子量可达到 1 0 5,且反应温度降低到 1 1 0℃ .1 H NMR分析表明 ,丙二腈在反应中起催化剂作用 ,通过削弱碳氮键可以提高转化速度 ,还可明显降低聚合温度 .Styrene polymerization mediated by TEMPO was distinctly accelerated by the addition of small amounts of malononitrile(MN). The polymerization proceeded in a living fashion as indicated by the increase in molecular weight with time and conversion and relatively low polydispersities. It was found that the polymerization rate was so quick that the conversion reached 70% within 1 h at 125 ℃ when n(MN)∶ n(TEMPO) equaled to 4∶1. Moreover the molecular weight could be controlled to 10 5 and the reaction temperature could be reduced to 110 ℃. Analysis of 1H NMR showed that MN only acted a catalyst to enhance the polymerization rate and reduce clearly the temperature by weakening the bond of C-O.

关 键 词：TEMPO 丙二腈 苯乙烯 聚合反应 加速作用 活性自由基聚合 加速剂 分子量 结构表征 

分 类 号：O632.12[理学—高分子化学]