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Dissolution, hydrolysis and crystallization behavior of polyamide 6 in superheated water

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Abstract

The dissolution, crystallization and hydrolysis behaviors of polyamide 6 (PA 6) in superheated water (140 °C ≤ T H ≤ 200 °C) are investigated. The hydrothermal processing of PA 6 can be divided into four regions: (I) T H < 140 °C, (II) 140 °C ≤ T H ≤ 155 °C, (III) 155 °C < T H < 160 °C and (IV) T H ≥ 160 °C. Below 140 °C, the hydrothermal processing does not have obvious impact on PA 6. Between 140 °C and 155 °C, an annealing effect is observed that the hydrothermally treated resin shows increased melting temperature and lamellar thickness compared with the original PA 6. Between 155 °C and 160 °C, the hydrothermal processing induces both annealing and surface swelling. Above 160 °C, PA 6 dissolves fully in the superheated water. As PA 6 dissolves in the superheated water, hydrolysis takes place and becomes more prominent at higher temperatures and longer processing time. The hydrolysis induced molecular weight decrease fits an exponential decay.

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Authors and Affiliations

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, 201620, China

    Zhi-liang Wang, Jia-li Xu, Lian-jia Wu, Xin Chen, Shu-guang Yang  (杨曙光) & Hui-chao Liu

  2. R & D Center, Guangdong Xinhui Meida Nylon Co., LTD., Jiangmen, 529100, China

    Xin Chen

  3. Department of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China

    Xian-ju Zhou

Authors
  1. Zhi-liang Wang
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  2. Jia-li Xu
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  3. Lian-jia Wu
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  4. Xin Chen
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  5. Shu-guang Yang  (杨曙光)
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  6. Hui-chao Liu
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  7. Xian-ju Zhou
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Corresponding author

Correspondence to Shu-guang Yang  (杨曙光).

Additional information

This work was financially supported by the National Natural Science Foundation of China (No. 51373032), Innovation Program of Shanghai Municipal Education Commission, Fundamental Research Funds for the Central University and DHU Distinguished Young Professor Program. Z.W. thanks the support from Chinese Universities Scientific Fund (No. CUSFDH-D-2014025).

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Wang, Zl., Xu, Jl., Wu, Lj. et al. Dissolution, hydrolysis and crystallization behavior of polyamide 6 in superheated water. Chin J Polym Sci 33, 1334–1343 (2015). https://doi.org/10.1007/s10118-015-1682-3

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  • DOI: https://doi.org/10.1007/s10118-015-1682-3

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