Premium
Phase behavior and physical properties of injection‐molded polyamide 6/phenoxy blends
Author(s) -
GuerricaEchevarría G.,
Eguiazábal J. I.,
Nazábal J.
Publication year - 1999
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/(sici)1097-4628(19990531)72:9<1113::aid-app1>3.0.co;2-g
Subject(s) - materials science , differential scanning calorimetry , polyamide , dynamic mechanical analysis , ultimate tensile strength , composite material , scanning electron microscope , heat deflection temperature , izod impact strength test , polymer , thermodynamics , physics
Polyamide 6 (PA 6)/poly(hydroxyether of bisphenol A) (phenoxy) blends were obtained by direct injection molding over the whole composition range. Differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and scanning electron microscopy (SEM) showed the almost full immiscibility of the blends and the lack of effect of phenoxy on the crystalline phase of PA 6. The rodlike and fine‐dispersed phase of the tensile specimens was strongly deformed during tensile testing, giving characteristic fibrilar structures. The Young's modulus and yield stress showed small deviations from additivity that appeared related mainly to the blending‐induced free‐volume change. Despite immiscibility, the ductility behavior was also additive, probably due to the fibrilar morphology. However, the thicker impact specimens gave rise to less oriented larger dispersed phases and to full plane strain conditions that, in opposition to ductility, yielded impact strength values well below linearity. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 1113–1124, 1999