氮化硼/磷杂菲三嗪化合物阻燃导热聚碳酸酯复合材料的制备及其性能研究

Preparation and characterizations of flame⁃retardant and heat⁃conductive polycarbonate⁃based composites with boron nitride and phosphaphenanthrene

基于氮化硼(BN)/磷杂菲三嗪化合物(TAD)构建了阻燃导热聚碳酸酯(PC)复合材料,并对其阻燃性能和导热性能进行了研究。结果表明,BN/TAD阻燃导热复合体系能够有效提高PC复合材料的阻燃性能,当BN添加量为20%,TAD含量为3%时,PC/20BN/3TAD复合材料的垂直燃烧测试达到UL 94 V-0级,极限氧指数达到35.1%;通过锥形量热仪测试,证明了BN/TAD阻燃导热复合体系能够有效降低热释放速率峰值、总热释放量、有效燃烧热等性能参数,并且二者在凝聚相中可以发挥出色的协同成炭效果,赋予PC复合材料优异的阻燃特性;从导热性能测试方面来看,BN/TAD阻燃导热复合体系的导热系数较纯PC相比提高了320%,获得了兼具优异阻燃特性和出色导热性能的PC复合材料。

A series of flame⁃retardant and heat conductive polycarbonate(PC)composites with boron nitride(BN)and phosphafetriazine compound(TAD)was prepared,and its flame retardancy and thermal conductance were investigated.Combustion experimental results indicated that the incorporation of BN and TAD improved the flame⁃retardant perfor⁃mance of PC effectively.The PC composite containing 20 wt%BN and 3 wt%TAD reached a UL 94 V⁃0 level in the vertical burning test,and its limiting oxygen index was 35.1 vol%.Cone calorimetric experimental results indicated that the BN/TAD flame⁃retardant and thermal conductive system effectively reduced the peak heat release rate,total heat re⁃lease,effective heat of combustion,and other performance parameters,and it could generate an excellent synergistic char⁃forming effect in the condensed phase,resulting in excellent flame⁃retardant performance for PC.Moreover,the PC/BN/TAD composite system obtained an increased in the thermal conductivity by 320%compared to pure PC,indicating high thermal conductance along with excellent flame⁃retardant performance of the PC⁃matrix composites.