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All‐polyethylene compositions based on ultrahigh molecular weight polyethylene: Synthesis and properties
Author(s) -
Ushakova Tatiana M.,
Starchak Elena E.,
Gostev Sergey S.,
Grinev Vitaly G.,
Krasheninnikov Vadim G.,
Gorenberg Arcady Ya.,
Novokshonova Lyudmila A.
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49121
Subject(s) - polyethylene , materials science , polymer , polymerization , methylaluminoxane , ultra high molecular weight polyethylene , ethylene , melt flow index , ultimate tensile strength , polymer chemistry , composite material , chemical engineering , catalysis , copolymer , chemistry , organic chemistry , metallocene , engineering
Reactor polymer compositions (RPC) of ultrahigh molecular weight polyethylene (UHMWPE) with M w = 1,000 kg/mol and low molecular weight high density polyethylene (LMWPE) with M w = 160 kg/mol were synthesized in a two‐stage ethylene polymerization with a rac ‐Me 2 Si(Ind) 2 ZrCl 2 /methylaluminoxane catalyst. The conditions of the stages that ensure the formation of UHMWPE and LMWPE fractions with the desired molecular weight and properties were selected based on the study of one‐stage ethylene polymerization over this catalyst in a wide temperature range. The order of fraction synthesis in RPC preparation was changed. Two series of compositions UHMWPE/LMWPE and LMWPE/UHMWPE with UHMWPE content from 20 to 90 wt% were obtained. The SEM method was used to study the morphology of the nascent polymer particles. It was shown that RPC physical and mechanical properties depend not only on the UHMWPE content, but also on the morphology of the particles of reactor powders, which is determined by the order of polymer fraction synthesis. Materials of LMWPE/UHMWPE series have higher tensile properties compared to UHMWPE/LMWPE of the same composition. The LMWPE/UHMWPE compositions containing ≤50 wt% of UHMWPE flow even at a load of 10.5 kg.