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Thermal Expansion Behavior of Poly(amide-imide) Films with Ultrahigh Tensile Strength and Ultralow CTE

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Abstract

A series of novel poly(amide-imide) (PAI) films with different amide contents were prepared from pyromellitic dianhydride and four amide-containing diamines. These PAI films exhibited excellent mechanical and thermal properties with tensile strength of 203.7–297.4 MPa and Tg above 407 °C. The rigid backbone structures combined with strong intermolecular interactions provided PAI films with ultralow in-plane CTE values from −4.17 ppm/°C to −0.39 ppm/°C in the temperature range of 30–300 °C. The correlation between thermal expansion behavior and aggregation structures of PAI film was investigated. The results suggested that hydrogen bonding interactions could be maintained even at high temperature, thus resulting in good dimension reversibility of films in multiple heating-cooling cycles. It is demonstrated that dimensional stabilities of PAI films are determined by the rigidity, orientation, and packing of molecular chains. Heat-resistant PAI films with ultralow CTE can be developed as flexible substrates by regulating backbones and aggregation structures for optoelectronic application.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51803221).

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Authors and Affiliations

  1. Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Lan Bai, Lei Zhai, Min-Hui He, Chang-Ou Wang, Song Mo & Lin Fan

  2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Lan Bai, Chang-Ou Wang & Lin Fan

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  1. Lan Bai
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  2. Lei Zhai
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  3. Min-Hui He
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Correspondence to Lei Zhai.

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Bai, L., Zhai, L., He, MH. et al. Thermal Expansion Behavior of Poly(amide-imide) Films with Ultrahigh Tensile Strength and Ultralow CTE. Chin J Polym Sci 38, 748–758 (2020). https://doi.org/10.1007/s10118-020-2366-1

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