RDP与葫芦脲协同阻燃聚碳酸酯的研究

Study on Flame-retardant Synergy of Polycarbonate with RDP and Cucurbituril

采用间苯二酚二苯基磷酸酯(RDP)复配大环分子葫芦[6]脲(CB[6])对聚碳酸酯(PC)进行无卤阻燃改性。通过极限氧指数仪、锥形量热仪、热失重分析仪及扫描电子显微镜测试分析了阻燃体系的阻燃性能、热性能及燃烧炭层的微观形貌。结果表明,RDP与CB[6]复配质量比为6∶2时阻燃效果最好,材料的极限氧指数达到32.5%,通过UL94 V-0级,热释放速率峰值(PHRR)降低至266 k W/m2;复配阻燃体系的加入改善了PC热稳定性,提高了阻燃复合材料的残炭率;复配阻燃体系能促进形成连续致密的膨胀炭层。

Flame-retardant polycarbonate（ PC） compounds were prepared by combination of resiorcinol bis（ diphenyl phosphate）（ RDP） and cucurbituril（ CB）,and their flame-retardant performance was evaluated by limiting oxygen index,UL 94 vertical burning experiment and cone calorimetry. Moreover,their thermal behaviors were investigated by thermogravimetric analysis,and the morphology of their residual char was determined by SEM. The results indicated that the compounds obtained an optimum flame-retardant effect at the RDP/CB mass ratio of 6/2 and achieved an limited oxygen index of 32. 5 vol%,a UL 94 V-0 classification and a heat release rate of 266 k W/m^2. The combination of RDP and CB improved the thermal stability of PC and enhance its char formation effectively. The morphological observation confirmed that a dense and compact intumescent char layer was formed due to a synergy between RDP and CB,consequently enhancing the flame retardancy upon PC.