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Composition distributions of different particles of a polypropylene/poly(ethylene‐ co ‐propylene) in situ alloy analyzed by temperature‐rising elution fractionation
Author(s) -
Xu JunTing,
Jin Wei,
Fu ZhiSheng,
Fan ZhiQiang
Publication year - 2005
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.22085
Subject(s) - copolymer , polypropylene , materials science , ethylene propylene rubber , polymer chemistry , polymer , polymerization , ethylene , alloy , chemical engineering , chemistry , composite material , catalysis , organic chemistry , engineering
Fragmentation was observed in the polymerization process for the preparation of a polypropylene (PP)/poly(ethylene‐ co ‐propylene) (EPR) in situ alloy. Composition distributions of different polymer particles were analyzed by preparative temperature‐rising elution fractionation. The fractions eluted at room temperature and 96, 110, and 117°C were selected for 13 C‐NMR characterization. There was more propylene homopolymer and ethylene–propylene block copolymer in the large particles, whereas the small particles contained more ethylene–propylene random copolymer and copolymer with a transition microstructure. On the basis of the formation mechanism of various components in the PP/EPR alloy, we inferred that the fragmentation of the polymer particles mainly took place in the copolymerization step. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 243–246, 2005