间规聚丙烯过氧化物在多官能团单体存在下的交联

过氧化物交联;交联动力学;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

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.