Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution

Jie Tang, Bowen Xu, Zhenhao Xi, Xun Pan, Ling Zhao

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Based on retaining the excellent properties of nylon-6 (PA6), nylon-6/66 copolymers (PA6/66) with well-controlled dimensional stability and toughness exhibit more potential applications. In this work, PA6/66 random copolymers were synthesized by melt copolymerization of μ-caprolactam and hexamethylene adipamide salt. The sequence distribution, crystal morphology, crystal forms, and melting and crystallization behavior of PA6/66 copolymers were systematically investigated by quantitative 13C NMR, polarized optical microscopy, wide-angle X-ray diffraction, and differential scanning calorimetry, respectively. The crystallization activation energy increases from -286.43 to -212.43 kJ mol-1 as the co-polyamide bond ratio increases from 0 to 0.22, while the deteriorating sequence regularity does not alter the original crystal morphology and crystal forms of PA6. Significantly, control over the crystallization behavior of PA6/66 copolymer has been obtained through finely regulating its sequence distribution. This work could provide theoretical support and new insights for controllable preparation of PA6 copolymers and ultimately be beneficial to extend their applications.

Original languageEnglish
Pages (from-to)15008-15019
Number of pages12
JournalIndustrial and Engineering Chemistry Research
Issue number44
Publication statusPublished - 7 Nov 2018


  • Crystals
  • Crystallization
  • Kinetics
  • Polymers
  • Copolymers


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