I. Introduction
Many kinds of aluminosilicate minerals such as zeolite, bentonite, kaoline, mica, etc have been used as inorganic fillers for conventional polymer composites, in which they not only reduce the cost but also give some special properties such as electrical insulation, modulus, hardness, thermal stability, thickening, etc. [1]–[4]. However, the wide difference of the elastic modulus or the thermal expansion coefficients between the inorganic fillers and the polymer matrices weaken the interfacial characteristics inducing the decrement of mechanical, electrical, and thermal properties. Therefore, many researchers have investigated to modify the interfacial strength by reducing the internal stress on the interface through the surface treatment of aluminosilicate minerals with coupling agents or by minimizing the filler size as possible as its size can be expressed in nano unit [5]–[7].