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.
Highlights
Mineral particulate fillers are used in polymer composites as substitutes of a relatively costly bulk material, but are used to improve some properties of neat polymers
Scanning electron microscopy (SEM) micrographs were used to examine the morphologies of PC filled with AMEO/vinyl trimethoxy silane (VTMO) silane treated and untreated mica
The reinforcement of modified mica increase flexural modulus by 29% at 2 wt% VTMO silane and 23% at 2wt% AMEO silane respectively
Summary
Mineral particulate fillers are used in polymer composites as substitutes of a relatively costly bulk material, but are used to improve some properties of neat polymers. The silane treatment clearly decreases the dispersive and specific component of the surface energy but changes fillerfiller, polymer-filler interactions and agglomerate packing properties [8, 9]. The temperature influences the rheological properties of the matrix but it can affect the state of dispersion of the composites via changes in the particle–particle interactions and in the wettability of the fillers with the matrix. Silane and zirconate coupling agent treated mica showed significant improvements in flexural and dielectric strength, as reported by Collins and Kludt [22] and Pushpa et al [23] respectively. Mica particles were introduced into PC compound, as a result of having hydroxyl group on the surface, and vinyl trimethoxy silane (VTMO), AMEO silane were chosen as a coupling agent to improve the properties of the PC/mica composites. The purpose of this article is to investigate the influence of the interaction between matrix and filler on rheological behavior for filled PC composites
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