HETEROLYTIC BROMINATION OF POLYSTYRENE IN HOMOGENEOUS PHASE .2. KINETICS OF BROMINATION CATALYZED BY SNCL4, SBCL5 AND TICL4

被引：6

作者：

CAMPS, M ^{[1
]}

MONTHEARD, JP ^{[1
]}

BENROKIA, F ^{[1
]}

机构：

[1] FAC SCI & TECH ST ETIENNE, CHIM ORGAN & MACROMOLEC LAB, F-42023 ST ETIENNE 2, FRANCE

来源：

EUROPEAN POLYMER JOURNAL | 1991年 / 27卷 / 4-5期

关键词：

D O I：

10.1016/0014-3057(91)90194-S

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The bromination of polystyrene (PS) by Br2 has been studied kinetically in the homogeneous liquid phase. The catalysts were the Lewis acids (AL) SnCl4, SbCl5 and TiCl4. The rate is expressed as k4[AL]-alpha-[Br2]3[PS] where alpha = 1.22, 1.25 and 2.0 for SbCl5, TiCl4 and SnCl4 respectively. The rate constant k4 increases with the proportion of CH2Cl2 in the mixture cyclohexane/CH2Cl2. The reactivity of PS is very close to that of cumene according to our kinetic measurements. No "neighbouring group effect" has been found. The presence of a brominated unit has no effect on the reactivity of a nearby styrene unit. A mechanism of bromination is proposed.

引用

页码：389 / 396

页数：8

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