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EFFECT OF THERMOPLASTIC POLYESTER BLEND ON THE MECHANICAL, THERMAL AND RHEOLOGICAL PROPERTIES OF POLYPROPYLENE

Pages 35-47

Aravinthan Gopanna and Murthy Chavali

Abstract

The objective of this study is the preparation and characterization of ternary blends consisting of polypropylene with poly(ethylene terephthalate) poly(butylene terephthalate) blends with a ratio of poly(ethylene terephthalate)  to poly(butylene terephthalate) concentration as 1. Poly(ethylene terephthalate) polypropylene blend, poly (butylene terephthalate) polypropylene blend and poly(ethylene terephthalate) poly (butylene terephthalate) polypropylene ternary blends were prepared by melt blending technique using a co-rotating twin-screw extruder. Acrylic acid grafted polypropylene (PP-g-AA) was used as compatibilizer. The mechanical, thermal, rheological and morphological behavior of the homopolymers, binary blends and ternary blends were investigated. The results confirmed that the ternary blends show enhanced mechanical and thermal properties compared to that of poly(ethylene terephthalate) polypropylene blend and poly(butylene terephthalate) polypropylene blend. The morphology study showed the homogenous dispersion of thermoplastic polyesters component in ternary blends lead to better interaction between polypropylene and thermoplastic polyester phases and thereby improved the overall mechanical properties of ternary blends. The rheological behavior of ternary blends with high viscosity at low shear rates useful for thermoforming applications.

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