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Effects of mixing time on phase structure and mechanical properties of poly(ethylene terephthalate)/ polycarbonate blends
Author(s) -
García M.,
Eguiazábal J. I.,
Nazábal J.
Publication year - 2001
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.1421
Subject(s) - materials science , polycarbonate , ultimate tensile strength , ethylene , composite material , young's modulus , yield (engineering) , polymer chemistry , izod impact strength test , phase (matter) , plastics extrusion , modulus , chemistry , organic chemistry , catalysis
The effects of interchange reactions on the solid‐state structure and mechanical properties of a 70/30 poly(ethylene terephthalate) (PET)/bisphenol A polycarbonate (PC) blend were studied. Increasing reaction levels were obtained by means of lower screw speeds in the extruder. The progressive production of copolymers with the reaction time increased the amount of each component in the other phase. The concomitant degradation of PET led to a maximum in ductility and tensile and impact strengths whereas the modulus of elasticity and the yield stress were held constant. The maximum in properties took place at a reaction time close to 2.6 min; at longer reaction times the negative effect of degradation began to overcome the positive effect of the interchange reactions. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 121–127, 2001