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Improvement of Structure and Properties of Polypropylene/Poly(ethylene‐ co ‐propylene) In‐reactor Alloy by Modifying the Cocatalyst
Author(s) -
Dong Qi,
Fan Zhiqiang,
Fu Zhisheng,
Xu Junting
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200751418
Subject(s) - alloy , polypropylene , materials science , ethylene , catalysis , copolymer , toughness , polymer chemistry , ethylene propylene rubber , chemical engineering , composite material , organic chemistry , chemistry , polymer , engineering
Summary : A series of polypropylene/poly(ethylene‐ co ‐propylene) in‐reactor alloy were synthesized by a TiCl 4 /MgCl 2 /SiO 2 /diester type Ziegler‐Natta catalyst, using triethylaluminium (TEA), triisobutylaluminium (TIBA) or TEA/TIBA mixtures of different molar ratio as cocatalyst. Mechanical properties of the alloy are strongly influenced by the cocatalyst. Toughness‐stiffness balance of the alloy synthesized using a 50/50 TEA/TIBA mixture as cocatalyst is much better than that of the alloy based on pure TEA cocatalyst. Changes in copolymer chain structure and composition distribution are thought to be the main reason for this improvement of properties.