摘要
以氯端基聚苯乙烯为大分子引发剂 ,氯化亚铜/2,2′-联二吡啶为催化剂 ,邻二甲苯为溶剂 ,用气相色谱分别研究了对二乙烯基苯(p-DVB)和间二乙烯基苯(m -DVB)在100～130℃的原子转移自由基聚合动力学。结果表明 ,聚合符合表观一级反应动力学。p -DVB在100 ,110,120 ,130℃的聚合速率常数分别为0.072 ,0.128,0.379 ,0.546h-1,m -DVB在上述不同温度的聚合速率常数分别为0.043 ,0.087 ,0.199 ,0.310h -1 ,p-DVB的聚合速率大于m -DVB的。m -DVB和 p-DVB聚合的表观活化能分别为84.1kJ/mol和89.2kJ/mol,两数值接近 ,表明温度对 p-DVB和m
The kinetics of atom transfer radical polymerization of p-DVB and m-DVB were investigated by using PSt-Cl as the macroinitiator and CuCl/bpy as the catalyst in o-xylene at 100～130 ℃. Gas chromatography was used to trace the concentration of DVB in the polymerization.The results showed that the polymerizations follow the first order kinetics and p-DVB polymerized faster than m-DVB. The apparent polymerization rate constants were kp-DVB,130 ℃=0.546 h-1, kp-DVB,120 ℃= 0.379 h-1, kp-DVB,110 ℃= 0.128 h-1, kp-DVB,100 ℃=0.072 h-1 for p-DVB and km-DVB,130 ℃=0.310 h-1,km-DVB,120 ℃= 0.199 h-1,km-DVB,110 ℃=0.087 h-1, km-DVB,100 ℃=0.043 h-1 for m-DVB. The apparent polymerization activation energies of m-DVB and p-DVB which were 84.1 kJ/mol for m-DVB and 89.2 kJ/mol for p-DVB were close to each other, and this suggested that polymerization temperature exert effect on the polymerization rate of both p-DVB and m-DVB to the similar extent.
出处
《合成橡胶工业》
EI
CAS
CSCD
2000年第3期156-158,共3页
China Synthetic Rubber Industry
基金
国家自然科学基金资助项目!(29634010-2)
关键词
间二乙烯基苯
自由基聚合
动力学
DVB
p-divinyl benzene
m-divinyl benzene
atom transfer radical polymerization
kinetics
