NiO_x与活性炭协效催化聚丙烯成炭及燃烧性能

Catalytic Carbonization of Polypropylene by the Combined Catalysis of NiO_x with Activated Carbon and Its Combustion Performance

利用不同价态的镍的氧化物(Ni Ox)为脱氢催化剂,活性炭(AC)为成炭促进剂,制备出了高效成炭阻燃材料,并研究了Ni的价态和AC含量及配比对聚丙烯(PP)催化成炭中PP自身成炭的影响。实验结果表明,Ni O与AC协同具有显著的催化成炭效果,其成炭率最高可达到32.3%;热释放速率(HRR)、质量损失速率(MLR)、热重分析表明PP/NiO/AC复合材料的HRR、MLR等燃烧特征参数均有所降低,具有较明显的阻燃性能和热稳定性;扫描电镜、高倍扫描电镜、透射电镜显示成炭结构为稳定的多壁碳纳米管(CNTs);X射线衍射结果表明NiO_x高温下还原成金属Ni,Ni作为活性中心催化PP脱氢裂解。

An efficient flame retardancy was prepared via catalyze carbonization of PP using nickel oxide（ NiOx） as catalyst of dehydrogenation and activated carbon（ AC） as promoter of carbon. The effects of the valence state of Ni,the content of AC and the ratio between the two on catalyze carbonization of PP were studied. The flame retardant performance and thermal stability of the composite were analyzed by heat release rate（ HRR）,mass loss rate（ MLR） and thermogravimetric analysis（ TG）. The morphology,phase structure and the growth mechanism of obtained char were characterized by SEM,TEM and XRD. The results indicate that NiO and AC show a synergistic catalysis on the catalyze carbonization of PP. Comparing to the pure PP,the HRR and MLR for PP / NiO / AC composites are all reduced dramatically. eg. peak HRR of PP /10 NiO /2. 5AC composite decreases by 62%,the results show that the addition of composite catalyst improves the flame retardant performance and thermal stability of PP. SEM and TEM show that the carbon structure is CNTs. The XRD results indicate that Ni catalyst derived from the reduction of NiOx catalyzes dehydrogenation and aromatization of degradation of PP.