Construction of Pressure-resistance Polyethylene-based Pipes with Highly Biaxially Oriented Structure and Self-reinforcing Mechanism  

作　　者：Bu-Yong Wu Yu-Dong Cai Xiao-Wen Zhao Lin Ye 

机构地区：[1]State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute of Sichuan University,Chengdu 610065,China [2]School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China [3]Synthetic Resin Laboratory,Petrochemical Research Institute,Petro China,Bejing 102206,China

出　　处：《Chinese Journal of Polymer Science》2023年第6期942-955,I0010,共15页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51773122 and 51933007);Natural Science Foundation of Sichuan Province(No.2022NSFSC0355);International Scientific and Technological Cooperation Project of Sichuan Province(No.2020YFH0084);Project of Engineering Characteristic Team of Sichuan University;Fundamental Research Funds for the Central Universities。

摘　　要：Fabrication of polyethylene(PE)pipe with significantly enhanced hoop strength and burst pressure is essential necessary for high transportation requirements.In this work,biaxially oriented PE/ultrahigh molecular weight polyethylene(PE/UHMWPE)blend pipes were fabricated on self-made pipe solid-phase die drawing apparatus.Due to formation of chain entanglement network and enhanced viscoelasticity,incorporation of UHMWPE chains improved stretchability and biaxial orientation degree of blend pipe.During die drawing,formation of more miscible blend system make long UHMWPE chains be sufficiently stretched under load,and such extended-chain conformation of UHMWPE acted as shish structure and induced short PE chains to array orderly and form kebab crystals.With increasing axial draw ratio,the lamellae remarkably deviated from hoop to axial direction,while the blend pipe exhibited higher crystallinity and orientation degree than that of PE pipe,presenting a more uniform and dense biaxial orientation structure with shish-kebab crystals.As a result,the blend pipe showed roughly 99%increase in tensile strength along hoop direction and 25%increase in burst pressure,respectively.Such biaxial self-reinforced PE/UHMWPE blend pipes exhibit promising application prospect as high-pressure transportation pipelines in civil engineering.

关 键 词：AXIAL CHAINS PIPES 

分 类 号：TU81[建筑科学]