期刊
POLYMERS
卷 13, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/polym13234216
关键词
flame retardant; graphene; melamine; phytic acid; nucleation effect
资金
- Joint Research Fund for Overseas Chinese Hong Kong and Macao Young Scholars [51929301]
- Scientific Research Project of Beijing Educational Committee [KM202010012005]
- National Natural Science Foundation of China [51903006]
- Beijing Scholar Program [RCQJ20303]
Based on the combination of melamine and phytic acid on rGO, the novel flame retardant PMrG significantly enhances the flame resistance of PLA by reducing heat release rate and increasing ignition time. The interaction between components in PMrG promotes the formation of a compact char layer, acting as a barrier to suppress heat and smoke release. Additionally, PMrG positively influences the crystallization of PLA, acting as a nucleation agent.
In this study, a novel flame retardant (PMrG) was developed by self-assembling melamine and phytic acid (PA) onto rGO, and then applying it to the improvement of the flame resistance of PLA. PMrG simultaneously decreases the peak heat release rate (pHRR) and the total heat release (THR) of the composite during combustion, and enhances the LOI value and the time to ignition (TTI), thus significantly improving the flame retardancy of the composite. The flame retardant mechanism of the PMrG is also investigated. On one hand, the dehydration of PA and the decomposition of melamine in PMrG generate non-flammable volatiles, such as H2O and NH3, which dilute the oxygen concentration around the combustion front of the composite. On the other hand, the rGO, melamine, and PA components in PMrG create a synergistic effect in promoting the formation of a compact char layer during the combustion, which plays a barrier role and effectively suppresses the release of heat and smoke. In addition, the PMrGs in PLA exert a positive effect on the crystallization of the PLA matrix, thus playing the role of nucleation agent.
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