Facile synthesis of aluminum branched oligo(phenylphosphonate) submicro-particles with enhanced flame retardance and smoke toxicity suppression for epoxy resin composites

Yao Yuan; Yongqian Shi; Bin Yu; Jing Zhan; Yan Zhang; Lei Song; Chao Ma; Yuan Hu

doi:10.1016/j.jhazmat.2019.121233

Facile synthesis of aluminum branched oligo(phenylphosphonate) submicro-particles with enhanced flame retardance and smoke toxicity suppression for epoxy resin composites

J Hazard Mater. 2020 Jan 5:381:121233. doi: 10.1016/j.jhazmat.2019.121233. Epub 2019 Sep 14.

Authors

Yao Yuan¹, Yongqian Shi², Bin Yu³, Jing Zhan⁴, Yan Zhang⁵, Lei Song⁵, Chao Ma⁶, Yuan Hu⁷

Affiliations

¹ Fujian Provincial Key Laboratory of Functional Materials and Applications, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, PR China; State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China.
² College of Environment and Resources, Fuzhou University, Fuzhou 350002, PR China.
³ Centre for Future Materials, University of Southern Queensland, Toowoomba, QLD 4350, Australia.
⁴ School of Civil Engineering and Environmental Engineering, Anhui Xinhua University, Hefei, Anhui, 230088, PR China.
⁵ State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China.
⁶ State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China. Electronic address: mcsky@ustc.edu.cn.
⁷ State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China. Electronic address: yuanhu@ustc.edu.cn.

PMID: 31557714
DOI: 10.1016/j.jhazmat.2019.121233

Abstract

A novel and submicro-scale aluminum branched oligo(phenylphosphonate) (AHPP) has been successfully synthesized and embedded into a polymeric substrate to improve the fire safety of epoxy resin (EP). The chemical structures of intermediates and target products were characterized using the nuclear magnetic resonance spectroscopy, X-ray diffraction and Fourier transform infrared analysis. Morphology analysis confirmed that all of the as-synthesized AHPP submicro-particles are mutually well-separated. Combustion results demonstrated that the limiting oxygen index value is increased to 30.5% from 23.5% while the PHRR and THR are decreased by ca. 68.1% and 41.2%, respectively for the EP/AHPP-7.5 composite compared to the corresponding values for pure EP. In addition, the binary blends display the satisfying smoke toxicity suppression performance during combustion. The total smoke production and the total CO yield for EP/AHPP-7.5 are dramatically reduced by 62.0% and 32.3%, respectively, which may mainly be ascribed to the catalytic carbonization performance of the polymers and formation of Al₂O₃ layers on the surface of the char residues. As a result, the findings in this study enabled the submicro-scale phosphorus-containing flame retardant to be a potential candidate as an efficient additive for reducing smoke toxicity of polymer composites.

Keywords: Branched flame retardant; Epoxy resins; Smoke toxicity suppression; Submicro-scale particles.

Publication types

Research Support, Non-U.S. Gov't