气氛对Cr2O3催化阻燃聚丙烯体系热降解动力学的影响

利用双辊混炼机制备了新型膨胀阻燃聚丙烯（PP）材料，并用热重（TG—DTG）方法研究了不同气氛下，Cr2O3催化膨胀阻燃聚丙烯的热降解动力学行为。试验发现，升温速率提高，材料的热降解推迟；在氮气气氛下，材料的热降解为两步反应．而空气气氛下，材料的分解更为复杂，失重明显提前。采用kissinger和Horowitz—Metzger法求取了材料的热降解参数，空气气氛下材料的热降解活化能明显低于氮气气氛下的活化能；氮气气氛下的活化能分别为237．46KJ／mol和245．80KJ／mol，基本一致：而空气气氛下的活化能相差较远：可能与材料在空气气氛下热降解反应的复杂性有关．

Effect of Atmosphere on Thermal Degradation Kinetics of Flame Retardant PP Catalyzed by Cr_2O_3

Novel Halogen-free retardant PP is prepared by using two-roll mill,thermal degradation kinetics behaviors of flame retardant PP under various atmospheres is studied by means of TGA-DTG.It is found that thermal degradation temperatures is delayed with the increases of heating rate;the process of thermal degradation in nitrogen atmosphere is a two-step reaction,but the process of thermal degradation in air is much more complicated,and weightlessness occurrs earlier comparatively.The thermal degradation parame...