Mechanically Strong, Thermally Healable, and Recyclable Epoxy Vitrimers Enabled by ZnAl-Layer Double Hydroxides

Li, Gaoming and Zhang, Ping and Huo, Siqi and Fu, Yingke and Chen, Lin and Wu, Yeping and Zhang, Yingyu and Chen, Mao and Zhao, Xiuli and Song, Pingan ORCID: https://orcid.org/0000-0003-1082-652X (2021) Mechanically Strong, Thermally Healable, and Recyclable Epoxy Vitrimers Enabled by ZnAl-Layer Double Hydroxides. ACS Sustainable Chemistry and Engineering, 9 (6). pp. 2580-2590.


Abstract

To meet the demand of sustainable development, epoxy vitrimers based on the dynamic transesterification reaction (DTER) have received considerable attention recently due to their reprocessability and repairability. However, they suffer from low mechanical strength and rely heavily on external catalysts to ensure their curing and repair. Herein, we report a facile design of a novel ZnAl-LDH-catalyzed epoxy vitrimer nanocomposite via introducing ZnAl-layered double metal hydroxide (ZnAl-LDH) nanosheets. Our results show that ZnAl-LDH can be well dispersed in the epoxy vitrimer. Notably, ZnAl-LDH has multifunctionality, which can simultaneously catalyze the curing reaction and enhance the mechanical strength and repairable efficiency of the resultant vitrimer. For instance, the peak curing temperature of epoxy vitrimer with 2 wt % ZnAl-LDH is 8 °C lower than that of an epoxy vitrimer under the same loading between Zn2+ of Zn(OAc)2, demonstrating a strong catalytic action. The tensile strength and Young’s modulus of ZnAl-LDH/epoxy resin (ER) increase from 18 and 156 MPa to 42 and 307 MPa, respectively, due to the reinforcing effect of ZnAl-LDH and the increased cross-linking density. The repairable efficiency of ZnAl-LDH/ER can reach 95% after repair at 200 °C for 1 h, which is mainly due to the abundant catalytic sites and large contact areas of the ZnAl-LDH lamella. Hence, this work offers an innovative and scalable strategy for creating epoxy vitrimers combining exceptional mechanical strength and high repairable efficiency, which holds great promise for many practical applications in the industry.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 26 Nov 2021 02:54
Last Modified: 01 Dec 2021 01:59
Uncontrolled Keywords: epoxy vitrimer; dynamic transesterification; ZnAl-LDH mechanical strength; reprocessability
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030305 Polymerisation Mechanisms
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
40 ENGINEERING > 4016 Materials engineering > 401609 Polymers and plastics
40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340305 Physical properties of materials
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340306 Polymerisation mechanisms
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
Identification Number or DOI: https://doi.org/10.1021/acssuschemeng.0c08636
URI: http://eprints.usq.edu.au/id/eprint/44049

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