文献类型：期刊文献

英文题名：Hierarchical structure manipulation of UHMWPE/HDPE fibers through in-reactor blending with Cr/V bimetallic catalysts

作者：Pan, Xuefeng[1];Shi, Jiaji[1];Jin, Yulong[2];Liu, Boping[2];Li, Liangbin[3,4];He, Xuelian[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Guangdong, Peoples R China;[3]Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Anhui, Peoples R China;[4]Univ Sci & Technol China, CAS Key Lab Soft Matter Chem, Coll Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China

年份：2019

卷号：175

起止页码：46

外文期刊名：COMPOSITES SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20191106621948);WOS:【SCI-EXPANDED(收录号:WOS:000466455100006)】；

基金：This work is financially supported by the National Natural Science Foundation of China (No. 51573048). We also appreciate the great help for SAXS/WAXD data analysis form Postdoctor Xiaowei Chen in University of Science and Technology of China and Professor Jinyou Lin in Shanghai Synchrotron Radiation Facility (SSRF), Beamline BL16B1.

语种：英文

外文关键词：High density polyethylene; Ultra-high molecular weight polyethylene; Fibres; In-reactor polymerization; Crystallization

摘要：A dramatically improved, uniform distribution of commercial ultrahigh molecular weight polyethylene (UHMWPE) with high-density polyethylene (HDPE) via solution blending, rather than that of melt blending, is often apparent in experimental investigation. Recently, we demonstrated that a UHMWPE/HDPE blend created by in-reactor polymerization with a Cr/V bimetallic catalyst supported on modified silica can obtain an even better molecular chain distribution while saving energy and solution costs, even more so than experiments using a solution blend. Furthermore, by gel-spinning processing, an abundance of hierarchical, interlocking shish-kebab crystals were generated in the in-reactor polymerized blend fibers (IRBFs), exhibiting better mechanical properties than those of solution blend fibers (SBFs). The tensile strength of the IRBFs increased by about 20% under the same draw ratio, since the interlocking shish-kebab structures contributed to homogenous deformation. The two kinds of fibers exhibit high crystallinity and have a highly oriented shish-kebab structure. Compared with the SBFs, the IRBFs inclined to form longer shish features and smaller kebab sizes, and the draw process was more conducive to the transformation of kebab to shish structures. Thus, the IRBFs can obtain an excellent hierarchal network structure, benefiting more from the hot-stretching process. Our work lays a solid foundation for the efficient fabrication of high-performance UHMWPE/HDPE fibers as well as the optimization of an original polyethylene catalyst system.