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Study on crystal structure and phase transitions of polyamide 12 via wide-angle X-ray diffraction with variable temperature

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Abstract

Polyamide 12 (PA12) is a long carbon chain polyamide with plenty of excellent properties. In this work, PA12 samples were prepared in three ways: solution casting (α-crystal form at 30 °C and α + γ-crystal form at 40, 50, 60, and 80 °C, respectively), melt slow cooling (γ-crystal form), and melt quenching (γ-crystal form), which undergoes isothermal crystallization in the range from room temperature to the temperature close to the melting point. The crystallization behaviors, including the crystal transition, d-spacing, and crystallinity, upon heating and cooling were measured by the wide-angle X-ray diffraction (WAXD) from 30 to 235 °C. The results show that the α-crystal form gradually transforms into γ-crystal form during heating, indicating the occurrence of Brill transition. The γ-crystal form is stable below Tm, whereas the γ-crystal form can transform into γ-crystal form above 110 °C. Only γ-crystal form appears when cooling, and most of the crystallization has been completed before cooling to 170 °C. The investigation provides more theoretical supports of phase transitions in PA12 for deep understanding of the modification, optimization, and application.

To investigate the crystallization behaviors of PA12, which were prepared in three ways: solution casting, melt slow cooling, melt quenching.

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Funding

This work is supported by the National Natural Science Foundation of China (Grant No. U1504527) and Zhongyuan Science and Technology Innovation Leading Talents Project (194200510030).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, Henan, People’s Republic of China

    Ruixin Dai, Miaoming Huang, Lili Ma, Wentao Liu, Suqin He, Hao Liu, Chengshen Zhu & Yujie Wang

  2. Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, Henan, People’s Republic of China

    Suqin He

  3. Isotope Institute Co., Ltd., Henan Academy of Sciences, Zhengzhou, 450015, Henan, People’s Republic of China

    Zhenya Zhang

  4. Key Laboratory of Additive Manufacturing Material of Zhejiang Province, Department of Functional Materials and Nano-Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, No.1219 Zhongguan West Road, Ningbo, 315201, Zhejiang, People’s Republic of China

    Aihua Sun

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  1. Ruixin Dai
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Correspondence to Wentao Liu or Suqin He.

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Dai, R., Huang, M., Ma, L. et al. Study on crystal structure and phase transitions of polyamide 12 via wide-angle X-ray diffraction with variable temperature. Adv Compos Hybrid Mater 3, 522–529 (2020). https://doi.org/10.1007/s42114-020-00192-y

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  • DOI: https://doi.org/10.1007/s42114-020-00192-y

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