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The influence of 1,4-cyclohexanedicarboxylic acid on the thermal and mechanical properties of copolyamides

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Abstract

The present paper describes the novel aliphatic polyamide 6 (PA6) copolyamides by the melt polymerization reaction of our newly synthesized aliphatic diamine monomer: N1,N6-Bis-(2-aminoethyl)adipamide (BAEA). The BAEA/CHDA (1,4-cyclohexanedicarboxylic acid) salt was prepared by pertinent long-chain polyamide with the cycloaliphatic ring and isolated as white solid, utterly characterized for the first time. The chemical structure of BAEA, BAEA/CHDA salt and copolyamides (PA6-BAEA/CHDA) was identified by 1H NMR and FT-IR spectroscopy. Depending on the chemical compositions, the viscosity and molecular weight of the copolyamides were in the range of 19,447–13,536 g mol−1 and 2.74–2.2 dL g−1. With increasing BAEA/CHDA salt molar ratio in the synthesized copolyamides, their melting temperatures (Tm) decreased from 212.7 to 170.4 °C, and the glass transition temperatures (Tg) increased from 60 to 89.4 °C. Besides, the as-synthesized all copolyamides possess nearly similar thermal stability (Td-50% = 439.59 − 443.38 °C) as neat PA6. Mechanical testing data revealed that with an increase in a proportion of BAEA/CHDA salt, Young’s modulus of copolyamides is increased from 698.54 to 1093.89 MPa, while the tensile strength is increased by 8.1%.

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Acknowledgements

The authors gratefully acknowledge the financial support from the National Science Council of Taiwan (MOST 107-3017-F-027-001)

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Authors and Affiliations

  1. Institute of Organic and Polymeric Materials, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao East Road, Taipei, 10608, Taiwan, ROC

    Chin-Wen Chen, Chiao-Wei Lin, Yu-Haw Chen, Tung-Fan Wei, Syang-Peng Rwei & Ragu Sasikumar

  2. Research and Development Center of Smart Textile Technology, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao East Road, Taipei, 10608, Taiwan, ROC

    Chin-Wen Chen, Yu-Haw Chen, Tung-Fan Wei, Syang-Peng Rwei & Ragu Sasikumar

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  1. Chin-Wen Chen
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Correspondence to Syang-Peng Rwei.

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Chen, CW., Lin, CW., Chen, YH. et al. The influence of 1,4-cyclohexanedicarboxylic acid on the thermal and mechanical properties of copolyamides. Polym. Bull. 77, 235–253 (2020). https://doi.org/10.1007/s00289-019-02738-7

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  • DOI: https://doi.org/10.1007/s00289-019-02738-7

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