Journal of Minerals & Materials Characterization & Engineering , Vol. 9, No.11, pp.985-996, 2010 jmmce.org Printed in the USA. All rights reserved 985 Morphological, Mechanical, Thermal, Electrical and Rheological Properties of Polycarbonate Composites Reinforced with Surfaces Modified Mica M. Rahail Parvaiz 1 , P. A. Mahanwar 2 , Smita Mohanty 1 and Sanjay K. Nayak* 1 1 Laboratory for Advanced Research in Polymeric Materials, Central Institute of Plastics Engineering & Technology, Bhubaneswar- 751 024, India. 2 Department of Polymer Engineering and Technology, University Institute of Chemical Technology, Matunga, Mumbai -400 019, India. * Corresponding Author: larpmcipet@gmail.com ABSTRACT The mica fillers reinforced Polycarbonate (PC) composites were fabricated using compression molding technique. The mica surface was chemically modified using vinyltrimethoxy silane and 3–Aminopropyltriethoxy silane. The properties of treated mica PC composites were examined in terms of scanning electron microscopy, thermo gravimetric analysis, differential scanning calorimetry and rheological behavior. The modified mica was observed to disperse more uniformly than the unmodified counterpart. The tensile strength and modulus also improved with treated mica filled PC composites. Polycarbonate (PC) / mica composites were prepared by twin screw extruder at 250 °C. Rheological behavior of PC/mica composites was investigated. The PC / mica composites were characterized by parallel plate rheometer system. As increasing the mica particle size and the content, storage and loss modulus of the PC / mica composites were increased. Keywords: Particulate reinforced composite; Mechanical; Thermal; Rheological properties; SEM 1. INTRODUCTION Mineral particulate fillers are not only used in polymer composites as substitutes of a relatively costly bulk material, but are also used to improve some properties of neat polymers. The properties of the composites depend upon the characteristics of components, composition, structure and interfacial interactions. The latter factor is affected by the size of the interface and the strength of the interaction. Both, the interface and strength of the interaction could be modified to improve the wettability and adhesion between the components by surface treatment