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含氮试剂调节异丁烯阳离子聚合中TiCl4的反应级数
Reaction order of TiCl 4 in cationic polymerization of isobutylene in the presence of the reagents containing nitrogen
【摘要】 分别研究了在N ,N 二甲基乙酰胺 (DMA)、吡啶 (PY)或三乙胺 (TEA)等不同种类的含氮试剂 (ED)存在下 ,H2 O/TiCl4 体系引发异丁烯 (IB)阳离子聚合的反应动力学 ,探讨了在不同ED条件下TiCl4 浓度对聚合反应的表观增长速率常数 (kAp)的影响 ,从而求出了TiCl4 在聚合反应中的反应级数。实验结果表明 ,随着TiCl4 浓度的增加 ,聚合反应转化率增加 ,聚合速率加快 ,在添加给电子性强的DMA、PY或TEA时 ,聚合速率与TiCl4 浓度均呈现一级动力学关系
【Abstract】 The kinetic study of the cationic polymerization of isobutylene(IB) using H 2O/TiCl 4 initiating system in the presence of the reagents containing nitrogen(ED) in CH 2Cl 2 solvent was conducted at -30 ℃. The reaction order with respect to TiCl 4 was investigated in the polymerization of IB when different ED s, such as pyridine(PY),N, N dimethylacetamide(DMA), or triethylamine(TEA) was added respectively. The experimental results show that the conversion and polymerization rate increase with TiCl 4 concentration. A first order dependence on TiCl 4 concentration was observed in the presence of DMA, PY or TEA with high donorcity.
【Key words】 cationic polymerization； isobutylene； electron donor； kinetic；
- 【文献出处】 北京化工大学学报(自然科学版) ,JOURNAL OF BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY , 编辑部邮箱 ,2001年04期
- 【分类号】TQ316.323
- 【被引频次】2
- 【下载频次】108