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Effect ofphosphorus-nitrogencompound on flame retardancy and mechanical properties of polylactic acid

机译：磷磷酸磷酸磷酸 - 氮磷酸 - 氮酸酸阻燃性和力学性能

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摘要

A phosphorus-nitrogen flame retardant (PN) was synthesized by using cytosine and diphenylphosphinic chloride. The flame retardancy and thermal stability of polylactic acid (PLA)/PN composites were investigated by the UL-94 vertical burning test, limited oxygen index (LOI), cone calorimeter test, and thermogravimetric analysis. The PN performs efficiently on improving the flame retardancy of PLA. The PLA composite achieves the UL-94 V-0 rating and its LOI increases to 30.4 vol% by adding 0.5 wt% PN. The flame retardant mechanism analysis showed that PN catalyzes the degradation of PLA to improve the flame retardancy by melting-away mode. Meanwhile PN reduces the release of flammable gasses during thermal degradation of PLA by promoting the transesterification of PLA, which is helpful for extinguishing flame. Moreover, triglycidyl isocyanurate (TGIC) was used as a micro-crosslinking agent to reduce the loss of mechanical properties of PLA/PN composites caused by degradation. Adding 0.1 wt% TGIC and 1.0 wt% PN into PLA, the tensile strength and elongation at break of PLA/PN are increased to the same level as that of PLA. Therefore, PLA with excellent comprehensive performance can be obtained.
机译：以胞嘧啶和二苯基氯化膦为原料合成了磷氮阻燃剂（PN）。通过UL-94垂直燃烧试验、极限氧指数（LOI）、锥形量热计试验和热重分析，研究了聚乳酸（PLA）/PN复合材料的阻燃性和热稳定性。PN能有效地提高PLA的阻燃性能。PLA复合材料达到UL-94 V-0等级，通过添加0.5 wt%PN，其LOI增加至30.4 vol%。阻燃机理分析表明，PN通过熔融方式催化PLA降解，提高阻燃性能。同时，PN通过促进PLA的酯交换反应，减少PLA热降解过程中可燃气体的释放，有助于灭火。此外，采用异氰脲酸三缩水甘油酯（TGIC）作为微交联剂，以减少PLA/PN复合材料因降解而造成的力学性能损失。在PLA中加入0.1wt%TGIC和1.0wt%PN，PLA/PN的拉伸强度和断裂伸长率提高到与PLA相同的水平。因此，可以获得综合性能优异的聚乳酸。

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