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The observation of PP / EVA blends in which isotactic PP was preradiated with different radiation absorbed doses
Author(s) -
Zhang Yicheng,
Li Jianxi,
Shen Liguo,
Lin Hongjun,
Shan Yongdong
Publication year - 2017
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.45057
Subject(s) - tacticity , materials science , crystallinity , fourier transform infrared spectroscopy , ethylene vinyl acetate , vinyl acetate , crystallization , polymer blend , polymer chemistry , polypropylene , absorbed dose , melt flow index , polymer , composite material , radiation , chemical engineering , nuclear chemistry , chemistry , polymerization , optics , copolymer , engineering , physics
ABSTRACT Isotactic polypropylene (PP) was preradiated by γ ray with different absorbed doses and subsequently blended with ethylene‐vinyl acetate (EVA) co‐polymer to prepare PP/EVA blends. The average molecular weight ( M n ) of isotactic PP decreased with the increasing radiation absorbed dose, which indicated that high energy radiation of γ ray broke the isotactic long PP chains into shorter ones. The melt flow rate results evidenced that the processing ability of PP/EVA blends was continuously promoted with the increasing absorbed dose. The β crystal was obtained in the PP/EVA blends by the radiation method. The onset temperatures and peaks of crystallization of PP/EVA blends decreased slightly with the increasing radiation absorbed dose, while high energy radiation was inclined to enhance the crystallinity of PP/EVA blends. The Fourier transform infrared spectroscopy (FTIR) tests confirmed an interesting phenomenon that PP tended to move to the surface of the PP/EVA blends with the increasing radiation absorbed dose. Mechanical tests proved that the PP/EVA blends remained a comparative stable mechanical property under the absorbed dose of 30 kGy. The experimental results indicated that PP/EVA blend was a potential candidate for industrial applying. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45057.