聚乳酸/苯基次膦酸铈复合材料的制备及性能

采用简单方法合成苯基次膦酸铈(CeP),并将其作为阻燃剂加入聚乳酸(PLA)中,通过熔融共混技术制备聚乳酸/苯基次膦酸铈(PLA/CeP)复合材料。通过热重(TG)、极限氧指数(LOI)、UL-94垂直燃烧(UL-94)、微型量热(MCC)研究复合材料的热稳定性、阻燃性能和燃烧性能。通过阻燃测试发现,CeP能够提高复合材料阻燃性能,PLA/CeP20极限氧指数能达到24.3%并通过UL-94 V-2级别。热重分析的结果表明,CeP显著提高了PLA/CeP复合材料初始分解温度和成炭率。MCC测试结果表明,CeP能明显降低PLA/CeP复合材料火灾危险性。PLA/CeP20热释放速率峰值(PHRR)和总热释放(THR)分别为397 W/g和13.6 kJ/g,与纯聚乳酸相比,分别下降了13.9%和28.0%。因此,苯基次磷酸铈对聚乳酸具有良好的阻燃效果。

Preparation and Properties of Polylactide/Cerium Phenylphosphinate Composite

Cerium phenylphosphinate(CeP)was synthesized by simple method and added into polylactide to prepare polylactide/cerium phenylphosphinate(PLA/CeP)composite by melt mixing method.Thermogravimetric analysis(TG),limiting oxygen index(LOI),Underwriters Laboratories 94 vertical burning test(UL-94)and microscale combustion calorimeter(MCC)were used to investigate thermal stability,flame retardancy and combustion properties of the composite.Flame retardant tests revealed that CeP could enhance flame retardancy of the composite.PLA/CeP20 presented LOI of 24.3%with UL-94 V-2 rating.TG test showed that CeP could significantly enhance degradation temperature and char residue of PLA/CeP composite.MCC test revealed that CeP could significantly decrease fire hazards of PLA/CeP composite.PLA/CeP20 presented peak of heat release rate(PHRR)and total heat release(THR)of 397 W/g and 13.6 k J/g,with reduction of 13.9%and 28.0%compared with those of virgin PLA.The above results indicated that CeP presented favorable flame retardant effect to PLA.