A core–shell‑structured APP@COFs hybrid for enhanced flame retardancy and mechanical property of epoxy resin (EP)

Bi, Xue and Di, Hang and Liu, Jia and Meng, Yafang and Song, Yuying and Meng, Weihua and Qu, Hongqiang and Fang, Lide and Song, Pingan ORCID: https://orcid.org/0000-0003-1082-652X and Xu, Jianzhong (2022) A core–shell‑structured APP@COFs hybrid for enhanced flame retardancy and mechanical property of epoxy resin (EP). Advanced Composites and Hybrid Materials. pp. 1-13. ISSN 2522-0128


Abstract

Epoxy resin (EP) is a commercially important resin with many important industrial applications but is impeded by its inherent flammability. Ammonium polyphosphate (APP) represents an eco-friendly and effective fire retardant for EP, but its moisture sensitivity and poor interfacial compatibility with EP often give rise to unsatisfactory fire retardance and adverse impacts on mechanical properties of EP. To address these issues, we herein report a core–shell-structured modified APP, APP@COFs, using Schiff base covalent organic frameworks (COFs) as a surface modifier. The results show that the addition of 2 parts per hundreds of resins (phr) APP@COFs effectively enhances the flame retardancy of EP, leading to a self-extinguishing capability and a limiting oxygen index of 27.1%. Compared with virgin EP, the peak heat release rate is decreased by 54.7% due to the modes of action of APP@COFs in both gas and condensed phases. Additionally, because of improved interfacial compatibility, the resulting EP/APP@COFs composites show improved mechanical properties, e.g., a 37% increase in the impact toughness of EP/2 phr APP@COFs relative to that of EP. This work provides an effective method for modifying APP and the development of advanced fire-retardant EP materials for practical applications in industries.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current – Faculty of Health, Engineering and Sciences - School of Agriculture and Environmental Science (1 Jan 2022 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 24 Mar 2022 02:04
Last Modified: 26 Mar 2022 05:55
Uncontrolled Keywords: Ammonium polyphosphate; Covalent organic frameworks; Epoxy resin; Flame retardancy; Mechanical property
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
Socio-Economic Objectives (2020): 24 MANUFACTURING > 2409 Industrial chemicals and related products > 240910 Plastics
24 MANUFACTURING > 2409 Industrial chemicals and related products > 240908 Organic industrial chemicals (excl. resins, rubber and plastics)
24 MANUFACTURING > 2409 Industrial chemicals and related products > 240904 Fine chemicals
24 MANUFACTURING > 2409 Industrial chemicals and related products > 240911 Resins
Funding Details:
Identification Number or DOI: https://doi.org/10.1007/s42114-021-00411-0
URI: http://eprints.usq.edu.au/id/eprint/47384

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