Processing Studies of Blends of Polypropylene with Liquid Crystalline Polymers
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
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Several processing methods to improve the mechanical properties of polypropylene PP by blending them with liquid crystalline polymers LCPs have been investigated in this study. Injection molded plaques of PP blended with LCPs showed significant improvements in the modulus but not exhibit any increase in tensile strengths and had poor surface finish. Higher tensile strength and better surface finish were obtained by compatibilization of PP with LCP. Compatibilization was carried out by a reactive extrusion process in which PP was grafted to LCP and it also further enhanced the modulus of the PPLCP blends. Finally the compatibilized and the non-compatibilized PPLCP blended plaques were processed by solid phase forming techniques in which the composites were deformed after preheating them below the melting point of the LCPs. This led to substantial increase in their modulus while not altering their tensile strengths.
- Polymer Chemistry