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...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。展开更多
A series of α-bromoarylethanones were prepared in high yields by a practical and efficient method. The arylethanones were reacted with bromine to give a mixture of α- and α, α-dibromides, which were debrominated w...A series of α-bromoarylethanones were prepared in high yields by a practical and efficient method. The arylethanones were reacted with bromine to give a mixture of α- and α, α-dibromides, which were debrominated with diethylphosphite in the presence of triethylamine to give the desired α-monobromo products.展开更多
文摘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。
文摘A series of α-bromoarylethanones were prepared in high yields by a practical and efficient method. The arylethanones were reacted with bromine to give a mixture of α- and α, α-dibromides, which were debrominated with diethylphosphite in the presence of triethylamine to give the desired α-monobromo products.
