原材料对硅烷接枝交联高熔体强度聚丙烯流动性能影响的研究  

Effects of Raw Materials on Fluidity of High-melt-strength PP Prepared by Silane Grafting and Cross-linking

作　　者：杨淑静[1] 谷正[1] 宋国君[1] 杨超[1] 王海龙[1] 亓峰[1] 

机构地区：[1]青岛大学高分子材料研究所,山东青岛266071

出　　处：《塑料》2007年第2期26-29,8,共5页Plastics

摘　　要：采用不饱和硅烷为接枝单体,不饱和烯烃为共单体,在双螺杆挤出机上实现均聚型聚丙烯的接枝交联,制得了高熔体强度聚丙烯。实验通过熔体指数(MFR)和凝胶含量的变化研究原材料对改性PP的影响。结果显示,体系中的试剂均严重影响材料的熔体流动性能。在硅烷和共单体共存的条件下,材料的熔体流动性能随引发剂A含量的增加而下降。共单体起到稳定大分子自由基的作用,增加了硅烷的接枝效率和接枝速率,共单体与硅烷最佳摩尔比为1∶1。改性后材料的耐热性、力学性能等均有较大提高。High-melt-strength PP was silane-grafted and cross-linked of isotactic PP with atwm screw extruder,using unsaturated silane as grafting monomer, unsaturated olefin as co-agent. The effects of the agents on modified PP were investigated by testing the changes of melt-flow-rate （MFR） and gel percentage. The results showed that each agent of the system had great effect on the melt-flow-rate and gel percentage. The fluidity of modified PP decreased with the increasing content of initiator A. The introduction of co-agent increased the degree and rate of silane grafting and cross-linking by stabilizing macromolecular radical. The optimum molar ratio of co-agent to silane was 1 ： 1. The modified PP indicated better heat resistance and excellent mechanical properties.

关 键 词：高熔体强度聚丙烯 硅烷 接枝交联 熔体指数 凝胶含量 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]