Grafting flame retardant groups onto common polymer molecule can be a good strategy to constructing superior flame retardant macromolecules, which provides a promising direction to fabricate fire safety polymer materials with satisfied comprehensive mechanical properties. In this thesis, a rubber-based phosphaphenanthrene grafted polymeric molecule (P-SBS) was synthesized via the grafting reaction of 9, 10-dihydro-9-oxa-10-phenanthrene-10-oxide (DOPO) with thermoplastic styrene-butadiene-styrene copolymer (SBS), and then applied to melt blending with polycarbonate (PC) to form P-SBS/PC blend with sea-island structure. The incorporated P-SBS not only brought PC much higher comprehensive flame retardancy, including higher limited oxygen index, shorter self-extinguishing time, less heat release during burning process, higher-quality char layer structure, and fewer amount of flammable volatile emission; but also endowed it with more satisfied comprehensive mechanical properties, including larger elongation at break, better anti-impact, higher flexural strength, and maintained tensile strength. By analysing burning residue, tracking thermal decomposition volatile emission, and inferring the pyrolysis route of P-SBS, the gas- and condensed-phase flame retardant mechanisms of P-SBS in suppressing the flammability of PC matrix were disclosed. The morphology analysis on the matrix fracture section and the embeded P-SBS particles before and after mechanical fracture, revealed the behavioral mechanism of P-SBS particles in improving the ductility, toughness, and stiffness of PC matrix. This study provides a beneficial reference to superior flame retardant molecule constructing and advanced flame retardant polymer material manufacturing.

中文翻译：

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橡胶基磷杂菲接枝聚合物及其在制备综合力学性能良好的阻燃聚碳酸酯共混物中的应用

将阻燃基团接枝到普通聚合物分子上是构建优异阻燃高分子的良好策略，为制备具有满意综合力学性能的防火高分子材料提供了一个有前景的方向。本论文通过9, 10-二氢-9-氧杂-10-菲-10-氧化物(DOPO)与热塑性苯乙烯-丁二烯-苯乙烯-丁二烯的接枝反应合成了橡胶基磷杂菲接枝聚合物分子(P-SBS)。苯乙烯共聚物（SBS），然后与聚碳酸酯（PC）熔融共混，形成海岛结构的P-SBS/PC共混物。掺入的P-SBS不仅使PC具有更高的综合阻燃性能，包括更高的限氧指数、更短的自熄时间、燃烧过程中放热更少、更高质量的炭层结构、更少的可燃挥发物排放量；同时还赋予其更令人满意的综合机械性能，包括更大的断裂伸长率、更好的抗冲击性、更高的弯曲强度和保持拉伸强度。通过分析燃烧残渣、追踪热分解挥发物排放以及推断P-SBS的热解路线，揭示了P-SBS抑制PC基体可燃性的气相和凝相阻燃机理。对机械断裂前后基体断裂截面和嵌入的P-SBS颗粒进行形貌分析，揭示了P-SBS颗粒改善PC基体延展性、韧性和刚度的行为机制。该研究为优异阻燃剂分子的构建和先进阻燃高分子材料的制造提供了有益的参考。