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Physical properties of blends of polycarbonate and a liquid crystalline copolyester
Author(s) -
Nobile M. R.,
Amendola E.,
Nicolais L.,
Acierno D.,
Carfagna C.
Publication year - 1989
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760290406
Subject(s) - materials science , copolyester , rheology , polycarbonate , composite material , polymer , thermal stability , shear rate , viscosity , mesophase , spinning , liquid crystal , chemical engineering , polyester , optoelectronics , engineering
Blends of polycarbonate (PC) and poly(ethylene terephthalate‐co‐p‐oxybenzoate) (PET/PHB60) were prepared by melt‐blending. Physical and/or chemical interactions between the two phases of the system were studied by thermal analysis and infrared spectroscopy. Rheological measurements in shear flow were carried out both in the low and high shear rate regions in the temperature range of the existence of the mesophase. At low liquid crystalline polymer (LCP) content, the blends showed flow curves similar to those of the unfilled PC, while at higher LCP percentages the rheological behavior of the pure LCP was resembled. Moreover, in the whole shear range, the viscosity values of such blends were in between those of the pure polymers. The influence of the addition of 10% LCP on the mechanical properties of the PC was investigated. Fiber‐spinning was performed under different experimental conditions, and it was found that opportune drawing conditions are necessary to improve the modulus of the matrix. Morphological analyses of the pure LCP and of the blends were related to the rheological and mechanical behavior of these systems. While the LCP exhibited an elevated dimensional stability, the inclusion of the LCP in PC matrix did not improve the dimensional stability of the blends.