A bio-based ionic complex with different oxidation states of phosphorus for reducing flammability and smoke release of epoxy resins

By Fang Fang, S. Huo, Shen Haifeng, S. Ran, Hao Wang, Pingan Song, Zhengping Fang. 2020

198 citations recorded by the source corpus.

Abstract Developing high efficient, environmentally friendly and bio-based flame retardants for combustible polymers has gained increasing interest. Herein, a novel highly efficient biomass-derived flame retardant (EHPP@PA) with different oxidation state phosphorus is prepared via neutralization of phytic acid (PA) and phenylphosphonate-based compound (EHPP). Due to synergistic effect between PA and EHPP, the incorporation of EHPP@PA significantly improves the flame-retardant performances of epoxy resin (EP), bringing about 64% reduction in peak heat release rate (pHRR) and 16% reduction in total heat release (THR). Additionally, EP/EHPP@PA also displays excellent smoke suppression performance, exhibiting 45% reduction in peak CO production (pCOP), 61% reduction in peak smoke release production rate (pSPR), and 21% reduction in total smoke production (TSP). The flame-retardant mechanism of EHPP@PA is further investigated, indicating that EHPP@PA effectively exerts flame-retardant effect in the condensed and gaseous phases during combustion. In the condensed phase, phytic acid facilitates the formation of a protective char shield, while in the gas phase, EHPP releases PO· and NO· to quench active radicals and inhibits the combustion.

Subfields: Polymers and Plastics, Safety, Risk, Reliability and Quality

View Paper: https://www.semanticscholar.org/paper/b62db18fddac8be4f72ec4edcfd675e7b7bcd011