Mechanical and morphological study of polyphenylene sulfide/liquid crystalline polymer blends compatibilized with a maleic anhydride grafted copolymer

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Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India ^{[1
]}

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]}

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Journal of Applied Polymer Science | 2007年 / 106卷 / 06期

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Blends of thermotropic liquid crystalline polymer (LCPA-950); based on a copolyester of hydroxynapthoic acid and hydroxybenzoic acid with an engineering thermoplastic; poly(phenylene sulfide) (PPS); were prepared using a corotating twin-screw extruder. Addition of a third component; a functionalized polypropylene (maleic anhydride grafted polypropylene; MA-PP); that interact with the thermotropic liquid crystalline polymer (TLCP) facilitates the structural development of the TLCP phase by acting as a compatibilizer at the interface. Differential scanning calorimetry and dynamic mechanical thermal analysis results; however; show that there is an interaction between the polymers in the presence of compatibilizer. This means that MA-PP can be used as a compatibilizer for the PPS/LCP in situ composite system. The viscosity of the compatibilized in situ composite was decreased by the compatibilizer; and this is mainly due to the fibrous structure of the LCP at the high shear rate. The mechanical properties of the ternary blends were increased when a proper amount of MA-PP was added. This is attributed to fine fibril generation induced by the addition of MA-PP. Morphological observations determined the significance of the third component in immiscible polymer blends; and an optimum amount of MA-PP exists for the best mechanical performance. ©2007 Wiley Periodicals; Inc;

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页码：3721 / 3728

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