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Phase behavior and mechanical properties of injection molded poly(ethylene terephthalate)/polyarylate blends
Author(s) -
Martínez J. M.,
Eguiazábal J. I.,
Nazábal J.
Publication year - 1992
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.1992.070450702
Subject(s) - materials science , differential scanning calorimetry , terephthalic acid , ethylene , poly ethylene , composite material , glass transition , polybutylene terephthalate , isophthalic acid , molding (decorative) , polyester , phase (matter) , miscibility , polymer chemistry , polymer , organic chemistry , chemistry , physics , thermodynamics , catalysis
Directly injection molded blends, composed of poly(ethylene terephthalate) and a polyarylate of bisphenol A, and isophthalic/terephthalic acids have been studied. Both their phase behavior and their mechanical properties after this blending method have been determined. After injection molding, the poly(ethylene terephthalate)/polyarylate blends show a single glass transition by differential scanning calorimetry, although the transition peaks of the blends widen when observed by dynamic mechanical analysis. The calorimetric results show a hindered crystallization of poly(ethylene terephthalate), due to the presence of polyarylate and the occurrence of interchange reactions. The mechanical behavior observed shows an improvement in the small‐strain properties of the blends with respect to those of the pure components. The break and impact properties of the blends show negative deviations with respect to linearity. These deviations are less important when high polyarylate content exists in the blends.