Abstract
Flexible transparent substrate materials, which was able to withstand high dynamic strain, in contrast to traditional substrate materials. A flexible and transparent material with advantages including transparency, stable size, and excellent corrosion and electrical resistance was provided. The polyimide(PI) film was prepared by introducing a structure with a high content of F atom and a fine optimization process to enhance the various properties of the film. However, the properties of the films were optimized effectively by gradient vacuum and secondary dissolution so that the film had a transmittance at 400 nm of 82%. The films with low dielectric constant and low dielectric loss represent the breakdown strength of 202 kV/mm. The glass transition temperature of the film was 267 °C, and the thermal expansion coefficient was 35ppm/k (30 °C~270 °C), indicated outstanding thermal dimensional stability. Therefore, this polyimide film was an optoelectronic device with extremely high application potential on the folding mobile phone and the PI film is the finest materials of screen.
Highlights
Transparent flexible substrate materials were capable of bending deformation, compared with traditional glass substrate materials
A new replacement of glass substrate material was provided by PI film, which was good at transparency, mechanical strength, corrosion resistance, heat resistance
The technology of gradient vacuum could improve the light transmittance, because it could avoid the discoloration caused by the solvent oxidation during the thermal imidization process and could deal with the bubble problem during the synthesis process, it was shown in Figure 4c that the technology of gradient vacuum could improve the light transmittance by about 2%
Summary
Transparent flexible substrate materials were capable of bending deformation, compared with traditional glass substrate materials. A new replacement of glass substrate material was provided by PI film, which was good at transparency, mechanical strength, corrosion resistance, heat resistance. Stretchability, electrical and thermal stability under mechanical deformation were new essential criteria because transparent films need to be applicable to next-generation material. A transparent material was provided by PI-HFBAPP/6FDA film This transparent film would not be corroded and deformed by chemical agents and had good transparency. By adjusting the polymer structure and optimizing the process especially, the film with high visible light transmittance was prepared on the premise of ensuring the film performance. This film had great development space in the market potential in the future
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