复合加工助剂对茂金属聚乙烯流变性能的影响  

EFFECT OF BINARY PROCESSING AID ON RHEOLOGY AND PROCESSABILITY OF METALLOCENE POLYETHYLENE

作　　者：刘小龙[1] 李惠林[1] 

机构地区：[1]高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065

出　　处：《高分子材料科学与工程》2004年第3期155-158,共4页Polymer Materials Science & Engineering

基　　金：国家重点基础研究专项经费资助项目(G1999064809);国家自然科学基金重点项目(50233010)

摘　　要：研究了PEG/硅藻土复合加工助剂对茂金属聚乙烯流变行为的影响。结果表明硅藻土和PEG复合使用时具有协同效应,明显提高对基体树脂的降粘性能。在加工剪切速率范围内,加入少量复合加工助剂,熔体表观粘度明显降低,熔体的剪切敏感性增强,加工流动性得到改善。同时复合加工助剂对改善鲨鱼皮熔体破裂也有一定的作用。The rheology of metallocene linear low-density polyethylene(mLLDPE)was investigated in capillary rheometer. mLLDPE showed high viscosity and low critical shear rate for the onset of sharkskin fracture. The effect of binary processing aid on rheological properties of metallocene polyethylene was studied. Small amount of binary processing aid improved the flow properties of metallocene polyethylene and increased the shear-shining character. Meanwhile, binary processing aid also showed effect on increasing the critical shear rate for the onset of sharkskin melt fracture.

关 键 词：助剂 茂金属聚乙烯 流变性能 剪切敏感性 粘度 分子量分布 

分 类 号：O632.12[理学—高分子化学] TQ325.12[理学—化学]