期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 97, 期 2, 页码 640-647出版社
WILEY
DOI: 10.1002/app.21805
关键词
alloys; chain; mechanical properties
Two polyethylene/polypropylene/poly(ethylene-co-propylene) in-reactor alloy samples with a good polymer particle morphology were synthesized by sequential multistage gas-phase polymerization with a spherical Ziegler-Natta catalyst. The alloys showed excellent mechanical properties, including both toughness and stiffness. With temperature-gradient extraction fractionation, both alloys were fractionated into five fractions. The chain structures of the fractions were studied with Fourier transform infrared, (CNMR)-C-13, and thermal analysis. The alloys were mainly composed of polyethylene, polyethylene-b-polypropylene block copolymer, and polypropylene. There also were minor amounts of an ethylene-propylene segmented copolymer with very low crystallinity and an ethylene-propylene random copolymer. The block copolymer fraction accounted for more than 44 wt % of the alloys. The coexistence of these components with different structures was apparently the key factor resulting in the excellent toughness-stiffness balance of the materials. (c) 2005 Wiley Periodicals, Inc.
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