摘要
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。
Novel Halogen-free retardant PP is prepared by using tworoll 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 occults earlier comparatively. The thermal degradation parameter of materials is acquired by Kissinger and Horowitz-Metzger methods. Activation energy＇ in air is lower than that in nitrogen. Activity energies of materials in nitrogen by the two methods are 237.46 and 245.80 KJ/mol separately, which are similar; but those in air are different, maybe which is related to the complexity of thermal degradation of material in air.
出处
《顺德职业技术学院学报》
2009年第1期15-18,共4页
Journal of Shunde Polytechnic
关键词
CR2O3
阻燃
聚丙烯
热降解动力学
活化能
Cr2O3
flame retardaney
PP
thermal degradation kinetics
activity energy
