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Properties of a thermotropic liquid crystalline polymer blended with different thermoplastics
Author(s) -
Chapleau Nathalie,
Carreau Pierre J.,
Peleteiro Carmen,
Lavoie PaulAndré,
Malik Tariq M.
Publication year - 1992
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.760322411
Subject(s) - materials science , thermotropic crystal , copolyester , composite material , polycarbonate , miscibility , polymer blend , polymer , glass transition , compatibilization , polyethylene terephthalate , dispersion (optics) , copolymer , liquid crystalline , polyester , physics , optics
Thermal, rheological, morphological, and mechanical properties of a thermotropic liquid crystalline polymer, TLCP (copolyester Vectra A‐950 from Hoechst), blended with a polycarbonate (PC), a polyethylene glycol terephthalate (PETG), and a blend of PC and PETG (20/80) are presented and discussed. Important supercooling effects are observed for the TLCP. For the blends the glass transition temperature of the matrix is shown to decrease slightly, suggesting partial miscibility of the components. A finer dispersion is observed for the TLCP/PC blends, at least for TLCP concentrations lower than 20%, for which the mechanical properties are quite good. For higher TLCP concentrations, as well as for the other two matrices, the mechanical properties follow more or less the mixing rule, and the morphology of the blends suggests poor adhesion. We were unable to obtain fibrillar structures by extruding the blends through a capillary rheometer; in the TLCP/PC blends, the TLCP domains were too small, and for the other blends the extrudates had not enough melt strength.