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Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers
Author(s) -
RamírezVargas Eduardo,
Margarita HuertaMartínez Blanca,
Javier MedellínRodríguez Francisco,
SánchezValdes Saúl
Publication year - 2009
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.29827
Subject(s) - copolymer , materials science , ethylene vinyl acetate , glass transition , elongation , composite material , compatibility (geochemistry) , polymer chemistry , vinyl acetate , amorphous solid , izod impact strength test , polymer , ultimate tensile strength , chemistry , crystallography
Compatibility mechanisms between EVA and PP copolymers (C‐PP) blends have been studied as a function of the type of copolymer, using a heterophasic PP copolymer (PP‐EP) and a random PP copolymer (PP‐ r ‐EP), with similar ethylene content. The morphology and thermal and mechanical properties of PP/EVA blends with different levels of EVA containing 28% vinyl acetate (VA) were determined. The obtained results indicated compatibility for both systems showing interactions at the amorphous interfaces; however, this interaction was higher for the PP‐ r ‐EP/EVA, which showed a single glass transition temperature and changes in the PP crystalline fraction (changes in the fusion temperature and in the diffraction patterns). The evolution of the morphology from isolated spherical domains (20% EVA) to elongated shapes (40% EVA) was related to the observed changes in thermal and mechanical properties. The impact strength and deformation properties showed significant improvement with increasing EVA content above 40% where the highest values of elongation for the PP‐ r ‐EPand of impact strength for the PP‐EP were obtained. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009