A Novel Self-Assembled Graphene-Based Flame Retardant: Synthesis and Flame Retardant Performance in PLA

Polymers

Jie Yang¹  Zhiguo Zhu¹  Hanguang Wu¹  Peixin Yang¹  Feifei Yang¹  Rui Wang¹ 

[1] School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China;

关键词: flame retardant;    graphene;    melamine;    phytic acid;    nucleation effect;   

DOI  :  10.3390/polym13234216

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown