The application and service life of poly (butylene terephthalate) (PBT) is limited by its brittleness and ultraviolet (UV) instability. Titanium dioxide (TiO₂) in PBT matrix can shield for UV light, but it triggers further photo-degradation of PBT via a photocatalytic effect. In this work, both toughness and against prolonged UV radiation of PBT from recycled source are significantly improved by reactive compounding with ethylene-vinyl acetate-glycidyl methacrylate copolymer (EVMG) and tailor-made double-shelled TiO₂@SiO₂-g-EVMG nanohybrids. The inner SiO₂ shell prevents direct contact of TiO₂ and the PBT matrix, while the grafted EVMG outer shell promotes a selective distribution and uniform dispersion of TiO₂ in the EVMG phase only. Consequently, the impact toughness of PBT/EVMG/TiO₂@SiO₂-g-EVMG nanocomposites is 18 times higher than that of neat PBT. Moreover, the tensile strength and the elongation at break of the nanocomposites remain 95% and 87% respectively after 48-h accelerated UV irradiation. Meanwhile, 90% UV light can be shielded by the PBT/EVMG/TiO₂@SiO₂-g-EVMG nanocomposites. Therefore, this work provides a facile route to make PBT nanocomposites with superior mechanical and UV resistant performances, which may broaden the application range of (recycled) PBT and e.g. PBT/Polycarbonate blends.

聚对苯二甲酸丁二醇酯（PBT）的应用和使用寿命受到其脆性和紫外线（UV）不稳定性的限制。PBT基质中的二氧化钛（TiO ₂）可以屏蔽紫外线，但是它会通过光催化作用触发PBT的进一步光降解。在这项工作中，通过与乙烯-醋酸乙烯酯-甲基丙烯酸缩水甘油酯共聚物（EVMG）和量身定制的双壳TiO ₂ @SiO ₂ -g-EVMG进行反应性配混，可以显着提高回收利用的PBT的韧性和抗紫外线辐射的能力。纳米杂种。SiO ₂内壳可防止TiO ₂直接接触和PBT基质，而接枝的EVMG外壳仅促进TiO ₂在EVMG相中的选择性分布和均匀分散。因此，PBT / EVMG / TiO ₂ @SiO ₂ -g-EVMG纳米复合材料的冲击韧性是纯PBT的18倍。此外，纳米复合材料的抗张强度和断裂伸长率在加速紫外线照射48小时后分别保持95％和87％。同时，PBT / EVMG / TiO ₂ @SiO ₂可以屏蔽90％的紫外线-g-EVMG纳米复合材料。因此，这项工作为制造具有优异的机械和抗紫外线性能的PBT纳米复合材料提供了一条简便的途径，这可能会拓宽（再生）PBT和PBT /聚碳酸酯混合物的应用范围。