The incorporation of traditional low molecule bromine flame retardants can enhance the flame retardancy of polycarbonate (PC), yet their poor compatibility with PC impairs its transparency and mechanical properties. Here, brominated polycarbonate (B50PC) was synthesized by interfacial polycondensation method using bisphenol A, tetrabromobisphenol A, and triphosgene. The number average molecular weight (Mn) of B50PC reached 14,600, and compared to the low molecule bromine flame retardant tetrabromobisphenol A (TBBPA), its initial decomposition temperature increased by 38.7 % under air atmosphere. The PC composites containing 5 wt% B50PC achieved the V-0 rating in the UL-94 test, with LOI increased by 10.3 %. At the same time, the peak heat release rate (PHRR) was decreased by 28.6 % and the ignition time (TTI) was delayed by 21.3 %. Compared with that of samples with TBBPA, the composite with the same amount of B50PC maintained the original elongation at break of PC and the transmittance remained at 84.9 %. In summary, the composites with B50PC maintains outstanding transparency and mechanical properties while enhancing the flame retardancy. This work has developed a high molecular bromine flame retardant that combines flame retardancy and transparency, offering a strategy for expanding the application of PC in the electronics, construction, and aerospace sectors.

中文翻译：

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同时具有热稳定性、透明性和薄壁阻燃性的含溴共聚物聚碳酸酯


传统的低分子溴阻燃剂的掺入可以增强聚碳酸酯（PC）的阻燃性能，但其与PC的相容性较差，损害了其透明度和机械性能。在此，使用双酚A、四溴双酚A和三光气通过界面缩聚法合成了溴化聚碳酸酯(B50PC)。 B50PC的数均分子量（Mn）达到14600，与低分子溴系阻燃剂四溴双酚A（TBBPA）相比，其在空气气氛下的起始分解温度提高了38.7%。含有 5 wt% B50PC 的 PC 复合材料在 UL-94 测试中达到了 V-0 等级，LOI 提高了 10.3%。同时，峰值放热率（PHRR）降低了28.6%，点火时间（TTI）延迟了21.3%。与含TBBPA的样品相比，等量B50PC的复合材料保持了PC原有的断裂伸长率，透光率仍保持在84.9%。综上所述，含有B50PC的复合材料在增强阻燃性的同时，保持了出色的透明度和机械性能。这项工作开发了一种兼具阻燃性和透明性的高分子溴阻燃剂，为扩大PC在电子、建筑和航空航天领域的应用提供了策略。