间规聚丙烯过氧化物在多官能团单体存在下的交联

Peroxide Crosslinking of Syndiotactic Polypropylene in the Presence of Polyfunctional Monomers

用二乙烯基苯 ( DVB)、二甲基丙烯酸乙二醇酯 ( EGDM)、三羟甲基丙烷三甲基丙烯酸酯( TMPTMA)、异氰脲酸三烯丙酯 ( TAIC)作为助交联剂对间规聚丙烯 ( s PP)进行了过氧化物交联 .结果表明 ,多官能团单体可以明显抑制间规聚丙烯在交联过程中的 β降解 ,促进 s PP交联 .由DVB和过氧化苯甲酰 ( BPO)组成的交联体系可以得到高交联度的 s PP交联产物 .随 DVB和 BPO用量增加 ,交联产物的凝胶含量增大 .交联反应动力学研究表明 ,凝胶生成速率随 BPO和 DVB用量增加而增大 ,呈动力学一级反应 .由凝胶生成速率与交联温度的关系曲线得到交联反应的表观活化能为 62 .5k

Peroxide crosslinking of metallocene syndiotactic polypropylene(sPP) has been performed in the presence of divinyl benzene(DVB), ethyleneglycol dimethylacrylate(EGDMA), trimethylol propane trimethylacrylate(TMPTMA) and triallyl isocyanuate(TAIC) as coagents. The polyfunctional monomers were found to prohibite the thermal degradation of sPP. The crosslinked sPP with higher gel fraction were obtained in the system comprised of BPO and DVB. The gel fraction of the crosslinked sPP increased with increase in BPO and/or DVB. The gelation rate increased linearly with the concentration of DVB and BPO, following first order kinetics. The apparent activation energy of crosslinking was 62.5 kJ/mol as determined from the relations between gelation rate and crosslinking temperature.