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Effect of melt viscosity of polypropylene on fibrillation of thermotropic liquid crystalline polymer in in situ composite film
Authors:Banchob Wanno  Jareerat Samran  Sauvarop Bualek-Limcharoen
Institution:(1) Department of Chemistry Faculty of Science, Mahidol University Rama 6 Road, Bangkok 10400, Thailand e-mail: scsbl@mahidol.ac.th, TH;(2) Department of Science Faculty of Science and Technology Prince of Songkla University Pattani 94000, Thailand, TH
Abstract: Various grades of polypropylene were melt blended with a thermotropic liquid crystalline polymer, a block copolymer of p-hydroxy benzoic acid and ethylene terephthalate (60/40 mole ratio). The blends were extruded as cast films at different values of draw ratio (slit width/film thickness). Fibrillation of TLCP dispersed phase with high fiber aspect ratio (length/width) was obtained with the matrix of low melt flow rate, i.e., high viscosity and with increasing film drawing. Melt viscosities of pure components and blends measured using capillary rheometer were found to decrease with increasing shear rate and temperature. Viscosity ratios (dispersed phase to matrix phase) of the systems being investigated at 255 °C at the shear rate ranged from 102 to 104 s−1, were found to lie between 0.04 and 0.15. The addition of a few percent of elastomeric compatibilizers; a tri-block copolymer SEBS, EPDM rubber and maleated-EPDM, was found to affect the melt viscosity of the blend and hence the morphology. Among these three compatibilizers, SEBS was found to provide the best fibrillation. Received: 10 January 2000/Accepted: 24 January 2000
Keywords:  Liquid crystalline polymers  In situ composite  Melt viscosity  Polypropylene  TLCP Fibrillation  Polymer blend
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