Premium
Chain structure of polyethylene/polypropylene in‐reactor alloy synthesized in gas phase with spherical Ziegler–Natta catalyst
Author(s) -
Fu Zhisheng,
Fan Zhiqiang,
Zhang Yanzhong,
Xu Junting
Publication year - 2004
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1527
Subject(s) - polypropylene , materials science , polyethylene , copolymer , crystallinity , alloy , ziegler–natta catalyst , natta , toughness , composite material , polymerization , polymer chemistry , polymer , fourier transform infrared spectroscopy , chemical engineering , engineering
Two polyethylene/polypropylene (PE/PP) in‐reactor alloy samples were synthesized by multi‐stage gas‐phase polymerization using a spherical Ziegler–Natta catalyst. The alloys show excellent toughness and stiffness. FTIR, 13 C‐NMR and thermal analysis proved that the alloys are mainly composed of polyethylene, PE‐ block ‐PP copolymer and polypropylene. There are also a few percent of ethylene‐propylene segmented copolymer with very low crystallinity. The block copolymer fraction accounts for more than 25 % of the alloy. The role of the block copolymer as compatibilizer between PE and PP is believed to be the key factor that results in the excellent toughness–stiffness balance of the material. Copyright © 2004 Society of Chemical Industry