Abstract
Polyethylene terephthalate (PET) is a very wildly used polymer material. Generally speaking, it is consumed by food package and clothing fiber industry. In order to improve its economic value, some scientists try to produce optical grade PET film. This kind of optical film will be used as back sheet of flexible touch panel. Due to the physical property of PET film, it will accumulate electrostatic and therefore make it hard for further processing. Adding SiO2 nanoparticle in PET film can reduce electrostatic; however, the particle size and its dispersity will contribute to haze, some kind of negative effect on optical film. We attempt to understand the interaction between SiO2 nanoparticle and PET by small angle X-ray scattering (SAXS), wide angle X-ray scattering (WAXS), differential scanning calorimetry (DSC), and transmission electron microscope (TEM). After several experiments, we discover that at low amounts of SiO2 nanoparticle (~1wt%) will increase the crystallization rate of PET. On the other hand, the larger concentration of SiO2 nanoparticle (~5wt%) the crystallization rate of PET will be suppressed. Furthermore, the SiO2 will disperse in PET in a fractal structure, the change of temperature will not change its structure.