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Study on the orientation structure and thermal dimensional stability of polyimide films based on infrared dichroism method

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Abstract

A series of uniaxially oriented polyimide (PI) films were fabricated via hot drawing at varying temperatures and draw ratios, and their orientation structure and thermal dimensional stability were investigated in detail. The infrared dichroism based on C = O symmetrical stretching was employed to effectively determine the orientation of chain segments. Other characteristic peaks, such as C = O asymmetric and C-N stretching, were highly sensitive to the geometric structure of chain segments, thereby providing a valuable means for comprehending their morphology. It has been observed that lower thermal expansion coefficient (CTE) can be achieved through low-temperature stretching, while high-temperature stretching is more effective in suppressing thermal shrinkage of the film. By quantitatively analyzing the orientation structure of infrared groups, the minimum structural unit highly associated with CTE was determined. These findings help to deepen our understanding of PI film performance and provide new ideas for studying thermal dimensional stability and draw processing.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51773007).

Funding

National Natural Science Foundation of China,51773007,Guofeng Tian

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Authors and Affiliations

  1. Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China

    Jianhua Wang, Gaojie Wu, Guofeng Tian, Shengli Qi & Dezhen Wu

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  1. Jianhua Wang
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  2. Gaojie Wu
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  3. Guofeng Tian
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  4. Shengli Qi
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  5. Dezhen Wu
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Contributions

Jianhua Wang: Methodology, Investigation, Writing-original draft. Gaojie Wu: Methodology, Validation. Guofeng Tian: Conceptualization, Methodology, Writing − review & editing, Funding acquisition, Supervision. Shengli Qi: Resources, Writing − review & editing. Dezhen Wu: Writing − review & editing, Supervision.

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Correspondence to Guofeng Tian or Dezhen Wu.

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Wang, J., Wu, G., Tian, G. et al. Study on the orientation structure and thermal dimensional stability of polyimide films based on infrared dichroism method. J Polym Res 31, 25 (2024). https://doi.org/10.1007/s10965-023-03866-5

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