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Zhou C, Dong S, Zhu P, Liu J, Wang D, Dong X. Strain-Induced Form Transition and Crystallization Behavior of the Transparent Polyamide. Polymers (Basel) 2021; 13:1028. [PMID: 33810276 PMCID: PMC8036806 DOI: 10.3390/polym13071028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/20/2021] [Accepted: 03/22/2021] [Indexed: 11/17/2022] Open
Abstract
A transparent polyamide, poly(4,4'-aminocyclohexyl methylene dodecanedicarboxylamide) (PAPACM12), was studied and characterized by in situ wide-angle X-ray diffraction (WAXD) to establish the relationship between its crystallization behavior, crystalline form transition under external fields, and macroscopic properties. During the heating process, cold crystallization occurred and increased, and there was no form transition below the melting point. During the isothermal process, PAPACM12 exhibited the same crystalline structure as that during the heating process. The crystalline structure of PAPACM12 was attributed to α-form crystal, which is the stable form, according to the WAXD diffraction peaks of the conventional AABB-type polyamides. During stretching deformation, the crystal transition from α-form to γ-form and strain-induced crystallization were observed to contribute to the PAPACM12 with higher breaking strength and elongation. This study firstly determine the crystalline structure of transparent polyamides, and then the controlled strain-induced crystallization and transformation are demonstrated to be effective preparation methods for polyamides with high properties.
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Affiliation(s)
- Chenxu Zhou
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (C.Z.); (S.D.); (P.Z.); (D.W.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Siyuan Dong
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (C.Z.); (S.D.); (P.Z.); (D.W.)
- College of Material Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China;
| | - Ping Zhu
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (C.Z.); (S.D.); (P.Z.); (D.W.)
| | - Jiguang Liu
- College of Material Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China;
| | - Dujin Wang
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (C.Z.); (S.D.); (P.Z.); (D.W.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xia Dong
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (C.Z.); (S.D.); (P.Z.); (D.W.)
- University of Chinese Academy of Sciences, Beijing 100049, China
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