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Studies of thermal oxidative degradation of polypropylene impact copolymer using the temperature rising elution fractionation method
Author(s) -
Nakatani Hisayuki,
Manabe Norio,
Yokota Yoshimitsu,
Minami Hiroaki,
Suzuki Shoutarou,
Yamaguchi Fumitaka,
Terano Minoru
Publication year - 2007
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.2254
Subject(s) - polypropylene , gel permeation chromatography , differential scanning calorimetry , copolymer , materials science , fractionation , polymer chemistry , activation energy , polyethylene , polymer , melting point , tacticity , fourier transform infrared spectroscopy , degradation (telecommunications) , elution , molar mass distribution , chemical engineering , chemistry , organic chemistry , chromatography , composite material , polymerization , telecommunications , physics , computer science , engineering , thermodynamics
Thermal oxidative degradation of polypropylene impact copolymer has been studied with its fractions obtained using the temperature rising elution fractionation method. The fractions were analyzed using 13 C NMR, Fourier transform infrared and differential scanning calorimetry measurements, and the chemical structure, isotacticity, conformation and melting point were investigated. It is found that these fractions are composed of a homopolymer or a polymer blend of polypropylene, polyethylene and ethylene–propylene copolymer. The thermal oxidative degradation of each fraction was carried out at 130 °C, and the degradation progress was estimated by the change of molecular weight distribution (from gel permeation chromatography curves). The rate of degradation is found to be dominated by the content of tertiary CH bonds (propylene unit) and the existence of 3 1 helix conformation corresponding to a crystalline polypropylene part in each fraction. The latter is more evident leading to the degradation reaction path with a lower activation energy. Copyright © 2007 Society of Chemical Industry