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Thermally Stable and Transparent Polyimide Derived from Side-Group-Regulated Spirobifluorene Unit for Substrate
Yunzhi Fang1, Xuemin Lu1, Junjie Xiao1
1School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
Macromolecular Rapid Communications
|July 16, 2024
Summary
New colorless polyimides (CPIs) with enhanced thermal stability and transparency were developed using rigid spirobifluorene diamines. These high-performance materials are suitable for advanced flexible electronics, addressing limitations in current substrate applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Organic Electronics
Background:
- Flexible electronic technologies like foldable displays and under-display cameras (UDCs) require high-performance colorless polyimides (CPIs).
- Existing CPIs exhibit insufficient heat resistance for demanding substrate applications in advanced electronics.
Purpose of the Study:
- To design and synthesize novel rigid spirobifluorene diamines for creating high-performance CPIs.
- To enhance the thermal stability and optical properties of CPIs for flexible electronic applications.
Main Methods:
- Synthesis of four rigid spirobifluorene diamines.
- Polyimide preparation via condensation with 6FDA or BPAF.
- Characterization of thermal and optical properties, including glass transition temperature (Tg), transmittance, and yellowness index (YI).
Main Results:
- Synthesized polyimides exhibited high glass transition temperatures (Tg) from 356 to 468 °C.
- Achieved excellent optical properties with average transmittance of 75–88% and a low YI of 2.48.
- 27SPFTFA-BPAF demonstrated superior performance: Tg 422 °C, Td5 562 °C, YI 3.53, and tensile strength 140 MPa.
Conclusions:
- Rigid spirobifluorene units significantly enhance the thermal stability and transparency of CPIs.
- The developed polyimides offer a promising pathway for designing materials for photoelectric engineering.
- Structure-property relationships were elucidated through experimental and theoretical investigations.
