| abstract |
The invention discloses a copolyester, a polyester film and a preparation method and application thereof, belonging to the technical field of PET films. The raw materials for preparing the copolyester include diol compounds, and the diol compounds include diols with methyl branching. By introducing methyl branched diol as the third monomer for copolymerization in the copolyester, the rigidity of the main chain can be effectively improved, the crystallization properties of the copolyester can be changed, the glass transition temperature can be increased, and the film material can be improved. At the same time, it will improve the light transmittance and mechanical properties of the film. The preparation method of the above-mentioned copolyester and polyester film is simple and easy to operate, and the obtained polyester film has a small thermal shrinkage rate when subjected to high temperature, is not prone to deformation and edge warping, and can be used for the preparation of flexible electronic products. |