Poor efficiency is one of the biggest challenges for halogen-free flame retardant polymer. Catalyzing the carbonization of polymer itself during combustion is proposed to be a promising way to address this issue. In this work, a novel macromolecular charring agent (MCA) decorated by zirconium phosphate nanosheet named ZrP-d-MCA was synthesized and characterized. Subsequently, it was combined with ammonium polyphosphate (APP) to reduce the flammability of polypropylene (PP). When the contents of ZrP-d-MCA and APP were 5 wt% and 15 wt%, respectively, PP/Zr-d-MCA/APP could reach a limiting oxygen index of 32.5% and achieve UL-94 V-0 rating. Moreover, the bench-scale combustion performance determined by the cone calorimeter was significantly improved. The flame-retardant mechanism of ZrP-d-MCA/APP was revealed: during combustion, ZrP nanosheet could efficiently catalyze the charring reactions of MCA to form closed micro-nano char-cages, in which the degradation products of PP would be trapped and catalyzed into thermostable graphitization char.

效率低下是无卤阻燃聚合物面临的最大挑战之一。提出在燃烧过程中催化聚合物本身的碳化是解决该问题的一种有前途的方法。在这项工作中，合成并表征了由磷酸锆纳米片装饰的新型大分子炭化剂（MCA），其命名为ZrP-d-MCA。随后，将其与聚磷酸铵（APP）结合使用，以降低聚丙烯（PP）的可燃性。当ZrP-d-MCA和APP的含量分别为5wt％和15wt％时，PP / Zr-d-MCA / APP的极限氧指数可以达到32.5％，并达到UL-94 V-0等级。此外，由锥形量热仪确定的台式燃烧性能得到了显着改善。ZrP-d-MCA / APP的阻燃机理被揭示：在燃烧过程中，