the applications of PET. Generally, the processability and physical properties of PET can be improved by enhancing, filling and blending ways . For instance, silica films have been widely used in industry as coating materials due to their excel- lent electrical, optical and chemical properties. They are used as passivation layers , antireflection layer , gas barriers for food and medical packages
In the glass transition state, the mechanical properties (such as deformation modulus, etc.) and physical properties (such as volume, density and specific heat) of the polymer will change. Correspondingly,
The computer simulation can be used as an effective means to predict the Tg, which has been applied to the glass transition of many polymers. In the majority of studies using molecular dynamics simulation, the Tg of the polymer can be obtained by analyzing its physical properties .