Effect of thermal resistant polymeric coatings on thermomechanical and topographical properties of glass fiber
Thermal resistant coatings, based on polysilazane and polysiloxane polymers, were applied onto the glass fiber rovings with the dip coating method. The coated glass fibers were characterized by performing different experiments to evaluate the effect of coatings on thermomechanical and topographical properties of glass fiber. The effect of temperature on the mechanical properties of the coated rovings were studied and compared with the uncoated rovings. Thermogravimetric analysis was carried out to investigate the thermal stability of coated samples. Scanning electron microscopy and energy dispersive X ray analyses were performed to evaluate the surface topographical characteristics of the glass fiber rovings. These analyses showed the changes in surface morphological properties due to modification of glass fiber by coating treatment. The results of tensile testing indicated that thermal resistant coatings enhanced up to 60% tensile strength and 20% stiffness of uncoated glass fiber roving. Thermomechanical study up to 500 revealed that polysiloxane coating on glass fiber showed better performance than polysilazane polymeric coating.