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Influence of cocatalyst on the structure and properties of polypropylene/poly (ethylene‐ co ‐propylene) in‐reactor alloys prepared by MgCl 2 /TiCl 4 /diester type Ziegler‐Natta catalyst
Author(s) -
Tu Songtao,
Fu Zhisheng,
Fan Zhiqiang
Publication year - 2011
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.33697
Subject(s) - electron paramagnetic resonance , materials science , tacticity , ethylene , ethylene propylene rubber , polymer chemistry , polypropylene , electron donor , catalysis , alloy , chemical engineering , composite material , chemistry , copolymer , organic chemistry , polymer , polymerization , nuclear magnetic resonance , physics , engineering
In this work, a series of polypropylene/poly(ethylene‐ co ‐propylene) (iPP/EPR) in‐reactor alloys were prepared by MgCl 2 /TiCl 4 /diester type Ziegler‐Natta catalyst with triethylaluminium/triisobutylaluminium (TEA/TIBA) mixture as cocatalyst. The influence of cocatalyst and external electron donor, e.g., diphenyldimethoxysilane (DDS) or dicyclopentyldimethoxysilane ( D ‐donor), on the structure and mechanical properties of iPP/EPR in‐reactor alloys were studied and discussed. According to the characterization results, PP/EPR was mainly composed of random poly(ethylene‐ co ‐propylene), segmented poly(ethylene‐ co ‐propylene), and high isotactic PP. Using TEA/TIBA mixture as cocatalyst and DDS as external electron donor, as TEA/TIBA ratio increased, the impact strength of iPP/EPR in‐reactor alloys had an increasing trend. Using TEA/TIBA mixture as cocatalyst and D ‐donor as external electron donor, the impact strength of iPP/EPR in‐reactor alloy were dramatically improved. In this case, the iPP/EPR in‐reactor alloy prepared at TEA: TIBA = 4 : 1 was the toughest. The influence of cocatalyst and external electron donor on the flexural modulus and flexural strength could be ignored. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011