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Polypropylene plasticization and photodegradation with a TiO 2 /poly(ethylene oxide)/methyl linoleate paint photocatalyst system
Author(s) -
Miyazaki Kensuke,
Arai Takayuki,
Nakatani Hisayuki
Publication year - 2014
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.39909
Subject(s) - photodegradation , polypropylene , crystallinity , materials science , ethylene oxide , plasticizer , polymer chemistry , polymer , chemical engineering , oxide , polymerization , ultimate tensile strength , polyethylene , photocatalysis , chemistry , composite material , organic chemistry , copolymer , catalysis , engineering , metallurgy
ABSTRACT The photodegradation of polypropylene (PP) film was performed by a TiO 2 /polyethylene oxide (PEO)/plant oil paint photocatalyst system. The photodegradation underwent two stages of development as follows: Initially PP reacted with linoleic acid radical originated from the photoreaction of plant oil component. Second, the linoleic acid graft‐polymer was decomposed, and then PP chain scission was caused. The process was studied using methyl linoleate (ML) in detail. The melting point of the 24 h‐photodegraded PP slightly decreased, and those of the 48 h‐ and 96 h‐ones drastically did as compared with the pristine PP. The crystallinity (χ c ) decreased at the 48 h photodegradation time and drastically increased at the 96 h one. The 24 h‐photodegraded PP showed the 77% Young's modulus, 88% tensile strength, and 103% strain at break values to those of the pristine PP. The ML graft‐polymerization and decomposition brought about the PP plasticizing and chemi‐crystallization, causing the PP degradation. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39909.