Journal
COMPOSITES PART B-ENGINEERING
Volume 186, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2020.107780
Keywords
Polymer-matrix composites (PMCs); Hybrid; Polyoxometalate; Flame retardancy; Thermal analysis
Funding
- National Natural Science Foundation of China [U1805253, 51973179]
- Scientific and Technical Project of Xiamen [3502Z20183001]
- Fundamental Research Funds for the Central Universities [20720190135]
- Natural Science Foundation of Fujian Province [2018J01079]
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Transition metal oxides based catalytic carbonization have been proved to be a promising way to enhance polymer flame retardancy, but finding better way to introduce organic phosphorus and transition metal oxide hybrids into polymer matrix to form nanocomposites is still a great challenge. In this work, an organic phosphorus and metal oxide hybrid compound named P-MnMo6 was prepared through combining 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) with polyoxometalate (POM). The as-prepared P-MnMo6 had a center of [MnMo6O18](3-) and was used as the precursor of transition metal oxides to improve the flame retardancy of epoxy resin (EP). With the aid of the organic modification, the addition of P-MnMo6 not only maintained the transparency of EP but also enhanced the dynamic mechanical properties. Notably, the then mogravimetric analysis showed that the char yield of EP/P-MnMo6 composite increased significantly. Besides, epoxy with 8 wt% addition of P-MnMo6 passed the vertical burning grade (UL-94) V-0 rating with the limiting oxygen index (LOI) value of 30.4%. Cone calorimeter test indicated the peak heat release rate of EP/P-MnMo6-4 decreased by 41%. Meanwhile, smoke products and CO were greatly suppressed. In addition, the potential flame retardancy mechanism of P-MnMo6 in epoxy matrix was proposed.
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