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在双酚A型聚碳酸酯/聚对苯二甲酸丁二醇酯合金(PC/PBT)中分别采用两种芳基磷酸酯[间苯二酚双(二苯基磷酸酯)(RDP)和双酚A双(二苯基磷酸酯)(BDP)]为阻燃剂,考察了其对PC/PBT合金力学性能、阻燃性能和其在锥形量热仪中的热释放行为影响。并且采用差示扫描量热仪(DSC)研究了芳基磷酸酯对PC/PBT体系的酯交换反应,以解释力学性能变化的原因。结果表明,RDP和BDP在PC/PBT中用量为10%时均达到UL94V-0级别,但加入BDP的体系的力学性能优于加入RDP的体系。热释放行为说明,RDP的阻燃作用同时包括气相与凝聚相作用,而BDP主要为凝聚相阻燃作用。BDP明显地抑制了PC/PBT的酯交换反应,因此有较好的力学性能。
In the bisphenol A polycarbonate / polybutylene terephthalate alloy (PC / PBT) were used two aryl phosphate [resorcinol bis (diphenyl phosphate) (RDP) and Bisphenol A bis (diphenyl phosphate) (BDP)] as a flame retardant, investigated its mechanical properties, flame retardancy and its heat release behavior in the cone calorimeter of PC / PBT alloy. And the transesterification reaction of aryl phosphate on PC / PBT system was studied by differential scanning calorimetry (DSC) to explain the reason of the change of mechanical properties. The results showed that both RDP and BDP reached the level of UL94V-0 when PC / PBT was 10%, but the mechanical properties of BDP-added system were better than that of RDP. Heat release behavior shows that the flame retardancy of RDP includes both the gas phase and the coacervate phase, while the BDP is mainly a coacervate phase flame retardant. BDP obviously inhibits the transesterification of PC / PBT and therefore has better mechanical properties.