【摘要】 本文以 UV 和¹HNMR 跟踪方法研究了二氯二茂钛（Cp₂TiCl₂）在二甲亚砜中的光化学反应,用自旋捕获技术来捕获 Cp₂TiCl₂催化丙烯腈单体聚合体系中所生成的自由基.UV 和¹HNMR 跟踪结果表明,Cp₂TiCl₂逐渐分解并生成环戊二烯.ESR 测定表明,用自旋捕获剂 PBN 和 BNO 都捕获到了环戊二烯自由基.进一步证明了 Cp₂TiCl₂催化乙烯基单体聚合反应是一种自由基机理.更多还原

【Abstract】 Mechanism of catalytic polymerization of acrylonitrile in the presence of titanocenedichloride under the light has been investigated by UV,~1H NMR and ESR spectroscopy. The results of photochemical reaction monitored by UV and NMR show that titanocenedichloride in dimethyl sulfoxide can be decomposed by the irradiation of light to givecyclopentadiene and dicyclopentadiene.ESR studies show that the intermediary cyclopen-tadienyl radical are trapped by two kinds of spin trapping agents,N-tert-butyl -α-phenyl nitrone and 2-methyl-2-nitrosopropane,respectively.Therefore,free radicalmechanism of catalytic polymerization of acrylonitrile in the presence of titanocenedichloride under the light is further confirmed.更多还原