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Electrospun polyimide nonwovens with enhanced mechanical and thermal properties by addition of trace plasticizer

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Abstract

Electrospun polyimide (PI) nanofiber nonwovens with excellent mechanical and thermal performance are highly required in many applications. The addition of phosphorus-containing compounds could be used as plasticizer to achieve this purpose. Herein, different amounts of trace diphenyl phosphate (DPhP) as plasticizer are added into the PI’s precursor for electrospinning. After imidization, phosphorous-containing electrospun PI nonwovens (PI-PX) are produced. The results indicate that the addition of DPhP significantly enhanced the thermal and mechanical properties of PI-PX. PI-P0.6 (0.6 wt% DPhP) shows a T5% of 510 °C in air and 561 °C in Ar, 29 °C and 40 °C higher than those of pure PI. PI-P0.6 also shows the highest tensile strength/modulus/toughness of 44 MPa/2.0 GPa/8.5 MPa, 208 MPa/9.7 GPa/40.7 MPa, and 123 MPa/3.3 GPa/25.1 MPa, respectively, when applying different thickness determinations. In addition, PI-P0.6 also exhibited much higher puncture strength than other Li-ion battery separators. Such PI-PX composite nonwovens would be good candidates for various applications, especially for Li-ion battery separators.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (21574060, 21774053, and 51903123); Major Special Projects of Jiangxi Provincial Department of Science and Technology (20114ABF05100); Technology Plan Landing Project of Jiangxi Provincial Department of Education (GCJ2011-24).

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Correspondence to Gaigai Duan or Haoqing Hou.

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Wang, D., Yu, J., Duan, G. et al. Electrospun polyimide nonwovens with enhanced mechanical and thermal properties by addition of trace plasticizer. J Mater Sci 55, 5667–5679 (2020). https://doi.org/10.1007/s10853-020-04402-2

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