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PBT/CaCO 3 composites were prepared in a single screw extruder with particle content varying from 0-30% by weight. The influence of surface treatment of the particles, with and without stearic acid (SA), on the mechanical, thermal and structural properties was studied. The experiments included tensile tests, impact tests, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy. The composite systems containing SA coated CaCO 3 were found to exhibit better mechanical properties as compared to composite systems containing uncoated CaCO 3 , with the S3 system (20% of SA coated CaCO 3 ) exhibiting best combination of mechanical properties. Thermal study revealed that particle type and content had no influence on the melting temperature but the crystallization temperature, % crystallinity and thermal stability increased on increasing the CaCO 3 content in PBT matrix. Morphological observation indicated that in PBT composites containing SA coated CaCO 3 , the coupling agent favours a better polymer filler interaction rendering inorganic polymer interface compatible, which is also evident from better mechanical and thermal properties.

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Particulate filled polymer composites are becoming attractive because of their wide applications and low cost. Present study deals with the preparation and characterization of PBT/wollastomte composites and analyzing the effect of incorporation of varying concentration of wollastonite on the mechanical, thermal, and morphological properties of PBT thermoplastic composite for future industrial applications. In the composites wollastonite content was varied by 0-30 % by weight. Tensile strength exhibited a marginal increase whereas a dramatic increase was observed in modulus with an increase in filler content. The experimental results were also compared with theoretical predictions which revealed good level of interfacial interaction in the composites. Thermal analysis revealed an increase in percent crystallinity and also the onset crystallization temperature thereby indicating the nucleating efficiency of wollastonite. Study of the fracture surface by SEM revealed a change in the micromechanical deformation process with an increase in filler content.

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