Conventional methods to improve the flame retardancy of polymeric materials usually involve the use of flame-retardant elements such as Cl, Br and P, however, their use may bring more smoke and toxic gases hazards, and more importantly, cause non-negligible environmental and ecological problems. In this work, we put forward a novel green strategy that eliminates the use of any conventional flame-retardant elements to improve the flame retardancy by incorporating a synergistically cross-linkable structure (named PN) containing phenylacetylene and phenylimide groups. The resulting PN copolymer exhibited an excellent 55% lower smoke release rate and 68% lower heat release rate than the pure polymer, as well as a high LOI value of 32% and UL-94 V-0 rating with excellent anti-dripping performance. TG-DSC, rheological and FTIR results proved the high cross-linking ability of the PN copolymer due to the synergistic cross-linking effect between the “imide-isoimide” rearrangement of phenylimide and the “self-cross-linking” of phenylacetylene. The SEM, Raman and Py-GC/MS results further upheld the condensed phase flame-retardant mechanism. This eco-friendly synergistic cross-linking strategy provided new perspective for the design and synthesis of polymeric materials with excellent flame retardancy, great anti-dripping performance, and low release of heat, smoke, and toxic gas.

改善聚合材料阻燃性的常规方法通常涉及使用阻燃元素，例如Cl，Br和P，但是，它们的使用可能会带来更多的烟尘和有毒气体危害，更重要的是，这会造成不可忽视的环境和危害。生态问题。在这项工作中，我们提出了一种新颖的绿色策略，该策略通过结合包含苯乙炔和苯基酰亚胺基团的可协同交联的结构（称为PN），消除了使用任何常规阻燃元素来提高阻燃性的问题。所得的PN共聚物与纯聚合物相比，烟气释放率降低了55％，热释放率降低了68％，LOI值高达32％，UL-94 V-0等级，具有出色的抗滴落性能。TG-DSC，流变学和FTIR结果证明，由于苯基酰亚胺的“酰亚胺-异酰亚胺”重排与苯基乙炔的“自交联”之间具有协同交联作用，PN共聚物具有很高的交联能力。SEM，拉曼光谱和Py-GC / MS结果进一步支持了凝相阻燃机理。这种环保的协同交联策略为聚合物材料的设计和合成提供了新的视角，该材料具有出色的阻燃性，出色的抗滴落性能以及低的热，烟和有毒气体释放。拉曼和Py-GC / MS的结果进一步支持了凝聚相阻燃机理。这种环保的协同交联策略为聚合物材料的设计和合成提供了新的视角，该材料具有出色的阻燃性，出色的抗滴落性能以及低的热，烟和有毒气体释放。拉曼和Py-GC / MS的结果进一步支持了凝聚相阻燃机理。这种环保的协同交联策略为聚合物材料的设计和合成提供了新的视角，该材料具有出色的阻燃性，出色的抗滴落性能以及低的热，烟和有毒气体释放。