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Significant approaches to promote post-cure reaction of bulky polyimides with pendant phthalonitrile unit

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Abstract

Approaches to promote the post-cure reaction of polyimide with pendant phthalonitrile unit (CN-PI) were first realized by introducing of hydroxyl groups via chemical copolymerization or physical blending. The post-cure reaction of the CN-PI was performed at 250 or 300 °C, and monitored by various techniques, such as infrared spectroscopy (IR), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). A significant result was found in that the trend of the increasing glass transition temperature T g with nitrile conversion followed DiBenedetto’s equation. This provided a chance to deeply discuss the relationship between molecular structure, segmental mobility, and cure behavior of CNPI. Chemical structure changes and morphology evolution of the polymer during post-cure process were investigated by IR, WAXD, and SEM. The thermal and mechanical properties of polymer films showed it to be a thermally stable and strong material.

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Authors and Affiliations

  1. State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, P. R. China

    Jianghuai Hu, Junwei Zhang, Yun Zou, Ke Zeng & Gang Yang

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  1. Jianghuai Hu
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  2. Junwei Zhang
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  3. Yun Zou
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  4. Ke Zeng
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  5. Gang Yang
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Correspondence to Ke Zeng or Gang Yang.

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Hu, J., Zhang, J., Zou, Y. et al. Significant approaches to promote post-cure reaction of bulky polyimides with pendant phthalonitrile unit. Macromol. Res. 22, 1074–1083 (2014). https://doi.org/10.1007/s13233-014-2158-y

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  • DOI: https://doi.org/10.1007/s13233-014-2158-y

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