【摘要】 用反应挤出法在聚丙烯 (PP)分子链上接枝甲基丙烯酸环氧丙酯 (GMA) ,制备功能化聚丙烯 .重点讨论了单体浓度、引发剂浓度、反应温度及物料在螺杆中的停留时间等对接枝产物 PP-g-GMA的接枝率、接枝效率和熔体流动速率的影响 .结果表明 ,PP-g-GMA接枝率与加入的单体浓度成正比 ,与引发剂浓度无关 ,反应挤出的适宜温度窗口在 1 95～ 2 3 0℃之间 ,停留时间超过 1 min后接枝率与停留时间无关 ;PP-g-GMA的熔体流动速率与单体浓度成反比 ,与引发剂的用量成正比 ,在反应温度窗口内与反应挤出温度和物料停留时间关系不大 ;单体和引发剂的浓度、反应挤出温度及物料停留时间对 PP-g-GMA的接枝效率无显著影响 .更多还原

【Abstract】 The functionalization of polypropylene grafted with glycidyl methacrylate(GMA) through reactive extrusion is reported. The influences of the concentration of GMA and initiator dicumyl peroxide(DCP), reaction temperature and residence time of materials in the extruder on the grafting degree(G_d), grafting efficiency(G_e) and melt flow rate(MFR) were investigated. The results showed that the G_d of PP-g-GMA was in direct proportion to the loading level of GMA. And there was a very limited effect of the concentration of the initiator on the grafting degree. The proper processing temperature window of the reative extrusion was 195~230 ℃. When the residence time of materials in the extruder was over one minute the grafting degree kept constant. The MFR of PP-g-GMA was proportional to the concentration of initiator and inversely proportional to the loading level of monomer. There were very limited effects of both the residence time and extruding temperature on the MFR of PP-g-GMA and no obvious influence of the concentration of monomer and initiator, extruding temperature and residence time of material in the extruder on the grafting efficiency of PP-g-GMA.更多还原