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Blends of thermotropic polyester with poly(phenylene oxide)
Author(s) -
Limtasiri T.,
Isayev A. I.
Publication year - 1991
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.1991.070421109
Subject(s) - thermotropic crystal , materials science , differential scanning calorimetry , rheology , ultimate tensile strength , phenylene , composite material , hydroxybenzoic acid , thermoplastic , polyester , dynamic mechanical analysis , polymer , polymer blend , scanning electron microscope , copolymer , organic chemistry , chemistry , liquid crystalline , physics , thermodynamics
A thermotropic liquid crystalline polymer (LCP) based on wholly aromatic copolyesters based on hydroxynaphthoic and hydroxybenzoic acid was melt‐blended with a thermoplastic poly(phenylene oxide) by corotating twin screw extruder. Rheological properties, temperature transitions, dynamic and mechanical properties, and electron microscopy study have been performed. Rheological study indicated significant viscosity reductions with increasing LCP content leading to ease of processing. From the differential scanning calorimeter (DSC) and dynamic mechanical thermal analyzer results, these blends showed incompatibility for the whole range of concentrations. Mechanical properties were found to be slightly improved at low LCP and dramatically improved at above 50% LCP contents. In addition, impact strength was significantly increased up to two times after adding 10% LCP into the matrix. The morphology of blends was affected by composition. Droplets and stubby fibrils structures caused lower tensile strength, whereas fibrillar structure improved this property.