一步法硅烷接枝交联改性均聚型聚丙烯的研究  

Modification of Isotactic Polypropylene by One-step Silane-grafting and Crosslinking Method

作　　者：杨淑静[1] 宋国君[1] 赵云国[1] 江峰[1] 杨超[1] 谷正[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1期91-95,共5页Plastics

摘　　要：通过反应挤出法一步实现均聚型聚丙烯的硅烷接枝和交联，制备出具有部分交联结构的高熔体强度聚丙烯。通过熔体强度、熔体黏度测试和熔体流动速率（MFR）、凝胶含量的变化研究了试剂体系对接枝交联改性的作用。结果显示，改性PP的MFR可降低至0．5g／10min以下，熔体强度提高4．1倍，熔体剪切黏度提高1．707倍；加入的助剂体系中的各个组分都是有效和必要的，而且体系各个组分之间有相互协同作用；改性配方中各个组分的用量比显著影响改性PP的熔体流动速率和凝胶含量，当引发剂、接枝单体、接枝助剂的用量比为（0．36～0．54）：1：0．38时，可以获得最佳的改性效果。High-melt-strength polypropylene with partially crosslinking was prepared by one-step silane-grafting and cross-linking of isotactic polypropylene （IPP） through reactive extrusion. The effects of the agent system on the modification were investigated by testing melt-strength, melt viscosity, the changes of melt flow rate （MFR） and gel content. The results showed that MFR of modified PP decreased to below 0. 5g/10min, and its melt-strength was improved 4. 1 times,while its melt viscosity was improved 1. 707 times. Each agent in the formulation was effective and necessary, and there was synergism for all agents in the system. The agent content ratio affected MFR and gel percentage of the modified PP greatly. When the dosage ratio of initiator, grafting monomer, grafting coagent was about （0.36～0.54）： 1：0. 38, the optimum modification was obtained.

关 键 词：一步法 硅烷接枝交联 高熔体强度聚丙烯 熔体流动速率 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]