ABSTRACT

In this paper, the laboratory-synthesized single-component intumescent flame retardant (IFR) and the phosphorus-containing polyhedral oligomeric silsesquioxane (P-POSS) as a novel synergist were combined to be applied in preparation of the halogen-free flame-retarded (FR) polypropylene (PP) composite. The involved structure, property and flame-retarding mechanism were systematically investigated. The experimental results show that incorporation of only 1.0 wt-% loading of P-POSS remarkably enhances the flame-retarding property and mechanical performance of FR PP composite, exhibiting the efficiently synergistic effect. The synergistic effect of P-POSS is explained by the reinforcing effect of its decomposition products SiO2 and phosphoric acid-based compounds on the condensed-phase char layers. Also, the incorporated 1.0 wt-% P-POSS particles significantly improve the dispersion of IFR fillers and the interfacial compatibility. The prepared FR PP composite possesses excellent comprehensive properties including a comparable mechanical performance of pure PP and flame retardancy (1.6 mm UL94 V-0 rating), and exhibits a good application prospect.

摘要

本文将实验室合成的单组分膨胀型阻燃剂（IFR）和作为新型增效剂的含磷多面体低聚倍半硅氧烷（P-POSS）组合应用于制备无卤阻燃剂（ FR) 聚丙烯 (PP) 复合材料。系统地研究了所涉及的结构、性能和阻燃机理。实验结果表明，仅加入 1.0 wt% 的 P-POSS 就显着提高了阻燃聚丙烯复合材料的阻燃性能和机械性能，表现出有效的协同效应。P-POSS 的协同作用可以通过其分解产物 SiO2 和磷酸基化合物对凝聚相炭层的增强作用来解释。此外，合并 1。0 wt-% P-POSS 颗粒显着改善了 IFR 填料的分散性和界面相容性。制备的阻燃聚丙烯复合材料具有与纯聚丙烯相当的力学性能和阻燃性（1.6 mm UL94 V-0等级）等优异的综合性能，具有良好的应用前景。