B. WannoJ. SamranS. Bualek-LimcharoenMahidol University2018-09-072018-09-072000-01-01Rheologica Acta. Vol.39, No.3 (2000), 311-319003545112-s2.0-0033842152https://repository.li.mahidol.ac.th/handle/20.500.14594/26021Various 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 (lenght/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 102to 104s-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.Mahidol UniversityMaterials SciencePhysics and AstronomyConference PaperSCOPUS10.1007/s003970000082