HIGH VISCOUS STRESS OF ORIENTED POLYOLEFINS UNDER UNIAXIAL TENSILE DEFORMATION  

作　　者：傅强 

机构地区：[1]Department of Polymer Science & Materials,Sichuan University,State Key Laboratory of Polymer Materials Engineering,Chengdu 610065,China

出　　处：《Chinese Journal of Polymer Science》2007年第3期285-290,共6页高分子科学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (Nos. 20404008, 50533050 and 20490220);This work was subsidized by the Special Funds for Major State Basic Research Projects of China (No. 2003CB615600).

摘　　要：In this communication, by means of stress relaxation experiments, the viscous stress at various strains during tensile deformation of oriented polyolefin samples including high density polyethylene （HDPE）, linear low density polyethylene （LLDPE） and isotactic polypropylene （iPP）, has been determined. The viscous stress in the oriented samples takes up to 50%-70% of the total stress, which is unusually high compared with their isotropic counterparts. The unusual high viscous stress was discussed based on mainly the existence of shish structure in oriented polyolefins, which could enhance the inter-lamella coupling significantly.In this communication, by means of stress relaxation experiments, the viscous stress at various strains during tensile deformation of oriented polyolefin samples including high density polyethylene （HDPE）, linear low density polyethylene （LLDPE） and isotactic polypropylene （iPP）, has been determined. The viscous stress in the oriented samples takes up to 50%-70% of the total stress, which is unusually high compared with their isotropic counterparts. The unusual high viscous stress was discussed based on mainly the existence of shish structure in oriented polyolefins, which could enhance the inter-lamella coupling significantly.

关 键 词：Viscous stress POLYOLEFIN Tensile deformation 

分 类 号：TQ317[化学工程—高聚物工业]