PC/ABS合金的气相/凝聚相协同阻燃作用

分别选用2种不同阻燃机理的磷系阻燃剂，即以凝聚相阻燃为主的间苯二酚-双(二苯基磷酸酯) (RDP)和以气相阻燃为主的磷酸三苯酯(TPP)，采用熔融共混法制备聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯共聚物(ABS)阻燃合金. 通过垂直燃烧测试和锥形量热测试探究RDP/TPP复配对合金阻燃性能的影响，通过扫描电子显微镜(SEM)观察燃烧残炭的微观形貌. 以甲基丙烯酸甲酯-丁二烯-苯乙烯(MBS)为相容剂，通过拉伸性能和冲击性能测试探究MBS对阻燃合金的增韧增容效果，并以SEM观察MBS对合金相界面和相形态的影响. 结果表明，RDP的凝聚相阻燃和TPP的气相阻燃作用具有协同效果，可以在PC/ABS合金中促进磷酸盐结构生成，进而有助于体系生成更连续、致密的炭层.

Synergistic flame retardancy of gas phase and condensed phase of PC/ABS alloy

Two kinds phosphorus flame retardants, resorcinol bis (diphenyl phosphate) (RDP) (mainly condensed phase flame retardant) and triphenyl phosphate (TPP) (mainly gaseous phase flame retardant), were selected to prepare flame retardant polycarbonate (PC) /acrylonitrile-butadiene-styrene copolymer (ABS) alloy by melt blending.The effects of RDP/TPP on the flame retardancy of the alloy were investigated by vertical combustion test and cone calorimetry. The micro morphology of the carbon residue was observed by scanning electron microscope (SEM). The toughening and compatibilizing effect of methyl methacrylate-butadiene-styrene (MBS) on the flame retardant alloy was studied by tensile and impact tests, and the effects of MBS on the phase interface and the morphology of the alloy were observed by SEM. Results show that the condensed phase flame retardant of RDP and the gas phase flame retardant of TPP have synergistic effect, which can promote the formation of phosphate structure in PC/ABS alloy, thus help the system to form a continuous and compact carbon layer.