聚乳酸/苯基次膦酸铝复合材料的制备及其阻燃性能研究

采用共沉淀法制备了苯基次膦酸铝(AlP)并对其进行表征。在此基础上，通过熔融共混法制备了一系列聚乳酸/苯基次膦酸铝（PLA/AlP）复合材料,采用热重分析（TG）、极限氧指数测试（LOI）、UL 94垂直燃烧测试、微型量热测试研究AlP对复合材料热稳定性、阻燃性能、燃烧性能的影响。结果表明,AlP可以有效提高PLA/AlP复合材料的阻燃性能, 当AlP含量为30 %（质量分数，下同）时，PLA/AlP30的极限氧指数达到25.6 %,并达到UL 94 为V-0级；AlP可以提高PLA/AlP复合材料初始分解温度和成炭性； PLA/AlP复合材料的热释放速率峰值和总热释放随着AlP添加量增大呈现先增高再下降的趋势。

Preparation of polylactide/aluminum phenylphosphinate composites and its flame retardancy

Aluminum phenylphosphinate (AlP) was synthesized by a co-precipitation method. A series of PLA/AlP composites were then prepared by melt blending, and the effect of AlP content on the thermal stability, flame retardant performance and combustion properties of the composites were investigated by thermogravimetric analysis, limiting oxygen index (LOI), vertical burning experiments and microscale combustion calorimeter (MCC). The results indicated that the incorporation of AlP enhanced the flame retardancy of PLA-matrix composites effectively, and the composites achieved a UL 94 V-0 classification as well as an LOI of 25.6 vol %. Thermal analysis showed that AlP improved the degradation temperature and residual char of the composites. MCC measurements demonstrated that the peak of heat release rate and the total heat release presented an increase at first and then decreased with an increase of AlP content.