采用TGA/FT-IR分析聚丙烯复合材料的热氧化降解行为

摘要

Polypropylene (PP)is a traditional thermoplastic,which has the advantage of excellent mechanical, good crystallinity,easy processing,and cheap price.But its flammable properties hinder its application in more areas.Development of flame retardant PP composites and study of their flame retardant mechanism is one of the key scientific problems in solving flammability of PP.In this paper,the thermal oxidative degradation behavior and flame retardant mechanism of the composites were carefully studied by using thermogravimetric analysis and thermogravimetric analysis coupled with FT-IR.The experimental results showed that the thermal stability of PP was not significantly changed by adding modified zirconium phosphonate flame retardant,but the thermal stability of residual carbon layer was improved after PP combustion,and the flammable gas emission rate and the amount of emissions were reduced in the combustion process,especially the toxic and harmful gas emission rate and the amount of emissions.These results fully proved that the modified zirconium phosphonate flame re-tardant is a green flame retardant.%传统的热塑性聚丙烯(PP)拥有优异的机械性能、良好的结晶性、易于加工、价格便宜等优点被广泛应用于诸多领域,但易燃性阻碍其应用.开发阻燃性PP复合材料及对其阻燃机理的认识是解决PP易燃性的关键科学问题之一.采用热失重(TGA)、热重-红外联用(TGA/FT-IR)的方法研究了阻燃PP的热氧化降解行为及阻燃机理.实验结果表明,改性的有机膦酸锆阻燃剂的加入没有对PP的热稳定性产生明显影响,而提高了PP燃烧后残碳层的热稳定性,减少了燃烧过程中可燃性气体的排放速率和释放量,减少了有毒有害气体的释放量和速率,有效地提高了PP复合材料的阻燃性能及安全性能.