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

  • Chin-Wen Chen
  • Chiao-Wei Lin
  • Yu-Haw Chen
  • Tung-Fan Wei
  • Syang-Peng RweiEmail author
  • Ragu Sasikumar
Original Paper


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%.


BAEA diamine CHDA Higher thermal stability PA6 copolyamides 



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


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Organic and Polymeric MaterialsNational Taipei University of TechnologyTaipeiTaiwan, ROC
  2. 2.Research and Development Center of Smart Textile TechnologyNational Taipei University of TechnologyTaipeiTaiwan, ROC

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