Polyimide nanofiber self-reinforced film with high transparency and low thermal expansion coefficient

ZHAO Yichun; LIU Feiyan; SUN Zhiteng; YOU Qingliang; LIU Xueqing; LIU Jiyan

doi:10.13801/j.cnki.fhclxb.20210312.005

Volume 38 Issue 12

Dec. 2021

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ZHAO Yichun, LIU Feiyan, SUN Zhiteng, et al. Polyimide nanofiber self-reinforced film with high transparency and low thermal expansion coefficient[J]. Acta Materiae Compositae Sinica, 2021, 38(12): 4023-4030. doi: 10.13801/j.cnki.fhclxb.20210312.005

Citation:

ZHAO Yichun, LIU Feiyan, SUN Zhiteng, et al. Polyimide nanofiber self-reinforced film with high transparency and low thermal expansion coefficient[J]. Acta Materiae Compositae Sinica, 2021, 38(12): 4023-4030. doi: 10.13801/j.cnki.fhclxb.20210312.005

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Polyimide nanofiber self-reinforced film with high transparency and low thermal expansion coefficient

doi: 10.13801/j.cnki.fhclxb.20210312.005

Key Laboratory of Photoelectrochemical Materials and Devices Ministry of Education, Hubei Flexible Display and Technology Collaborative Innovation Center, Jianghan University, Wuhan 430056, China

Received Date: 2020-12-21
Accepted Date: 2021-03-07

Available Online: 2021-03-12

Publish Date: 2021-12-01

Abstract

Abstract

The colorless polyimide (PI) used for the flexible display field is required to have high transparency and low thermal expansion coefficient C_TE. However, the C_TE value of commercial colorless PI film is above 40×10⁻⁶/℃. In the study, nanofiber self-filled PI film was prepared by embedding the PI nanofiber-net in thermoplastic fluorinated polyimide solution (PI-F). The nanofiber-net self-filled PI film demonstrates high transparency retention, much C_TE and excellent tensile property. The results show that the fiber of nanosize avoids light scattering, therefore the high transparency of the film is retained. When the PI fiber mass fraction is 10%, the transparency of the film is 80.5%. In comparison to the pure PI-F film, the C_TE of composite film is reduced by 40.3% and reaches 28.3×10⁻⁶/℃; The tensile strength and the tensile modulus of the composite film are increased by 132.9% and 89.5%, respectively and are 107.6 MPa and 1152.2 MPa correspondingly.
- polyimide,
- nanofibers,
- micro-structure,
- self enhancement,
- thermal expansion coefficient
Long Abstrsct
Innovation Points

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References(24)

References

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