Micro-Macro Scale Relationship in Creep Deformation of Ultra High Molecular Weight Polyethylene  

作　　者：Bi-Jin Xiong Zhen-Xian Chen Jian Kang 

机构地区：[1]Key Laboratory of Materials Chemistry for Energy Conversion and Storage(HUST)of Ministry of Education,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology(HUST),Wuhan 430074,China [2]State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute of Sichuan University,Chengdu 610065,China

出　　处：《Chinese Journal of Polymer Science》2021年第12期1665-1672,共8页高分子科学（英文版）

基　　金：by the National Natural Science Foundation of China(Nos.51973077 and 21604088).Prof.Yongfeng Men is appreciated for fruitful discussion.

摘　　要：Macroscopic and microscale creep deformations of UHMWPE were investigated by using in situ SAXS.A methodology for the measurement of the local creep deformation of inter-lamellar amorphous phase has been proposed.The local strain of inter-lamellar amorphous phase(£a)and macroscopic strain(£macro)were evaluated and they were compared to study the relati on ship betwee n macroscopic and microscale creep deformation of UHMWPE.Both of them exhibit two deformation regions against creep time.The entanglements show a strong impact on both the macroscopic and local inter-lamellar amorphous phase creep behavior and they can be well correlated to the molecular weight between two entanglements estimated from strain-hardening modulus.Compared to the macroscopic creep deformation,local inter-lamellar amorphous layers have a smaller creep deformation.From the local creep measurement,the apparent modulus of inter-lamellar amorphous phase can also be estimated(200<Ma<500 MPa).These values are much higher than the Young's modulus of bulk amorphous PE,which can be well explained by the confinement of the lamellar stacks and the enhancement of the amorphous phase with the relatively high concentration of entanglements.This study provides a useful means and quantitative data for achieving the scale transition between the micro and the macro structural levels for the study of viscos-elastic deformation.

关 键 词：Ultra-high molecular weight polyethylene CREEP Small angle X-ray scattering MICROSCALE 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]