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Song R.,Northeast Forestry University | Song R.,Heilongjiang Key Laboratory of Flame Retarded Polymeric Materials | Yang Y.,Northeast Forestry University | Yang Y.,Heilongjiang Key Laboratory of Flame Retarded Polymeric Materials | And 4 more authors.
Bulletin of Materials Science | Year: 2012

In a typical chemical vapour deposition (CVD) process for synthesizing carbon nanotubes (CNTs), it was found that the aromatization catalysts could promote effectively the formation of CNT. The essence of this phenomenon was attributed to the fact that the aromatization catalyst can accelerate the dehydrogenation-cyclization and condensation reaction of carbon source, which belongs to a necessary step in the formation of CNTs. In this work, aromatization catalysts, H-beta zeolite, HZSM-5 zeolite and organically modified montmorillonite (OMMT) were chosen to investigate their effects on the formation of multi-walled carbon nanotubes (MWCNTs) via pyrolysis method when polypropylene and 1-hexene as carbon source and Ni 2O 3 as the charring catalyst. The results demonstrated that the combination of those aromatization catalysts with nickel catalyst can effectively improve the formation of MWCNTs. © Indian Academy of Sciences.

Luan S.,Northeast Forestry University | Luan S.,Heilongjiang Key Laboratory of Flame Retarded Polymeric Materials | Ding L.,Northeast Forestry University | Ding L.,Heilongjiang Key Laboratory of Flame Retarded Polymeric Materials | And 5 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2011

In order to obtain flame-retarded polypropylene (PP) by catalysis and carbonization, we found a novel catalytic char-forming agent (acidizing expanded graphite(SXGO)/nickel oxide(Ni2O3)) of PP. Flame-retardant results indicate that a synergistic catalysis of combined SXGO with Ni2O3 can accelerate dehydrogenization and aromatization of degradation products of PP, the highest char yield and the best flame retardancy of PP materials can be obtained with the composition of PP materials (PP/SXGO/Ni2O3:92/3/5), which is proved by cone calorimeter tests. The morphologies and structures of the char obtained were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and the char formation mechanism was analyzed further.

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