聚丙烯管材专用料的熔体降解及其对力学性能的影响  

Study on Melt Degradation and Its Influence on Mechanical Pgoperties of PP Pipe Compound

作　　者：丁健[1] 丁雪佳[1] 徐日炜[1] 余鼎声[1] 梁亚辉[2] 

机构地区：[1]北京化工大学材料学院,北京100029 [2]扬子石油化工股份有限公司塑料厂,江苏南京210048

出　　处：《塑胶工业》2005年第4期4-6,共3页

摘　　要：在双螺杆挤出机中，对无规共聚聚丙烯（PP-R）和嵌段共聚聚丙烯（PP-B）管道专用料的熔体降解行为及其对力学性能的影响进行了研究：对助剂量、熔体温度等工艺条件对降解行为的影响进行了讨论。结果表明：降低熔体温度，可明显降低PP-R和PP-B的热降解速率：降解优先发生在长链分子，导致摩尔质量减小．摩尔质量分布变窄，力学性能下降。The degrading behavior during extrusion in a twin - screw extruder of model ZSK-300 and its influence on the mechanical properties of PP-R and PP-B for pipe compounds were studied. The effects of stabilized agent, MFR and melt temperature on degrading behavior were discussed. The results showed the degrading rate markedly decreased only if the melt temperature of PP-R and PP-B decreased. The degradation was favor for the longer molecule chains, resulted in decrease of molecular weight, narrow MWD and worse of mechanical properties.

关 键 词：无规共聚聚丙烯 嵌段共聚聚丙烯 双螺杆挤出 降解控制 力学性能 管材专用料 降解行为 熔体温度 摩尔质量分布 双螺杆挤出机 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] TU532.61[建筑科学—建筑技术科学]