Incorporating flame retardant fillers is the most efficient way to improve the fire resistance of polylactide (PLA). However, most flame retardant fillers result in deterioration of the mechanical property of PLA so far. Therefore, to create high-performance PLA materials combining excellent flame retardancy with superior mechanical properties remains highly attractive and challenging. In this study, a novel isosorbide-derived poly(phosphoester) (PIDI) was synthesized and used as a bio-based flame-retardant for PLA. The addition of PIDI showed a marginal effect on the change of the glass transition temperature of the PLA composites, but the crystallinity degree of the PLA composites was improved by the inclusion of PIDI. Benefitting from the improved crystallinity, the tensile strength, flexural strength, and impact strength of PLA composite containing 15 ​wt% PIDI was enhanced by 19.4%, 14.1%, and 36.9%, respectively, compared to the virgin PLA. With the addition of 20 ​wt% PIDI, the PLA composite showed an LOI value of 25.5% and a UL-94 V-0 rating in the vertical burning test. The flame retardant effect of PIDI was also demonstrated by a notable reduction (−46%) in the peak heat release rate (PHRR) of PLA composite containing 20 ​wt% PIDI. Such a renewable isosorbide-derived poly(phosphoester) is one of the promising candidates for PLA bio-composites with an outstanding balance between flame retardancy and intrinsic physical properties.

加入阻燃填料是提高聚乳酸 (PLA) 耐火性的最有效方法。然而，迄今为止，大多数阻燃填料都会导致 PLA 的机械性能变差。因此，创造兼具优异阻燃性和优异机械性能的高性能 PLA 材料仍然极具吸引力和挑战性。在这项研究中，合成了一种新型异山梨醇衍生的聚（磷酸酯）（PIDI），并将其用作 PLA 的生物基阻燃剂。PIDI的加入对PLA复合材料玻璃化转变温度的变化影响不大，但PIDI的加入提高了PLA复合材料的结晶度。得益于提高的结晶度、拉伸强度、弯曲强度，与原始 PLA 相比，含有 15wt% PIDI 的 PLA 复合材料的冲击强度和冲击强度分别提高了 19.4%、14.1% 和 36.9%。添加 20 wt% PIDI 后，PLA 复合材料在垂直燃烧测试中显示出 25.5% 的 LOI 值和 UL-94 V-0 等级。PIDI 的阻燃效果还通过含有 20% PIDI 的 PLA 复合材料的峰值热释放率 (PHRR) 显着降低 (-46%) 得到证明。这种可再生的异山梨醇衍生的聚（磷酸酯）是 PLA 生物复合材料的有前途的候选者之一，具有阻燃性和固有物理特性之间的出色平衡。在垂直燃烧测试中为 5% 和 UL-94 V-0 等级。PIDI 的阻燃效果还通过含有 20% PIDI 的 PLA 复合材料的峰值热释放率 (PHRR) 显着降低 (-46%) 得到证明。这种可再生的异山梨醇衍生的聚（磷酸酯）是 PLA 生物复合材料的有前途的候选者之一，具有阻燃性和固有物理特性之间的出色平衡。在垂直燃烧测试中为 5% 和 UL-94 V-0 等级。PIDI 的阻燃效果还通过含有 20% PIDI 的 PLA 复合材料的峰值热释放率 (PHRR) 显着降低 (-46%) 得到证明。这种可再生的异山梨醇衍生的聚（磷酸酯）是 PLA 生物复合材料的有前途的候选者之一，具有阻燃性和固有物理特性之间的出色平衡。