A series of transparent, intrinsically flame-retardant, and impact-resistant poly(carbonates-b-siloxanes) were synthesized by incorporating Schiff-base modified polysiloxanes (DMS-Schiff) and naphthalene-sulfonate units into the polycarbonate (PC) chain. In addition to high transparency, the resultant copolymers (SS-co-PC5, SS-co-PC9, SS-co-PC14, and SS-co-PC20) exhibited remarkable improvements in fire safety and mechanical performance. Compared to pure PC, these copolymers demonstrated significantly enhanced limiting oxygen index (LOI, up to 34.5%) and a UL-94 V-0 rating under a thickness of only 1.6 mm. The incorporation of the polysiloxane blocks not only improved flame retardancy but also enhanced the impact strength, with SS-co-PC9 showing a 48% increase in elongation at break and a 38% rise in impact toughness compared to pure PC. In addition, SS-co-PC9 presented high mechanical strength. The synergistic effects between the naphthalene-sulfonate and polysiloxane blocks, along with the well-controlled polysiloxane phase separation (sulfonate units enabled lower processing viscosity of copolymers), led to superior comprehensive performance. These findings provide a promising pathway to create high-performance copolycarbonates for real-world applications.

中文翻译：

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透明、本质防火且耐冲击的聚（碳酸盐-b-硅氧烷），含有席夫基和萘磺酸盐


通过将席夫基改性聚硅氧烷 （DMS-Schiff） 和萘磺酸盐单元掺入聚碳酸酯 （PC） 链中，合成了一系列透明、本质阻燃和抗冲击的聚碳酸酯-b-硅氧烷。除了高透明度外，所得共聚物（SS-co-PC5、SS-co-PC9、SS-co-PC14 和 SS-co-PC20）在防火安全和机械性能方面也表现出显着改善。与纯 PC 相比，这些共聚物在仅 1.6 mm 的厚度下表现出显著提高的极限氧指数（LOI，高达 34.5%）和 UL-94 V-0 等级。聚硅氧烷嵌段的加入不仅提高了阻燃性，还增强了冲击强度，与纯 PC 相比，SS-co-PC9 的断裂伸长率提高了 48%，冲击韧性提高了 38%。此外，SS-co-PC9 具有较高的机械强度。萘-磺酸盐和聚硅氧烷嵌段之间的协同效应，以及控制良好的聚硅氧烷相分离（磺酸盐单元能够降低共聚物的加工粘度），从而实现了卓越的综合性能。这些发现为创造用于实际应用的高性能共聚碳酸酯提供了一条有前途的途径。