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Study on the Flame Retardancy of HIPS/OMMT/Nickel Compound Composite

Author: ZhangYingYi
Tutor: ZhangJun
School: Qingdao University of Science and Technology
Course: Materials Science
Keywords: High-impact polystyrene Montmorillonite Nickel compounds Nickel oxide Carbonize Flame retardant
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 39
Quote: 2
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Abstract


In this study, high-impact polystyrene (HIPS) as the research object, in polymer melt Montmorillonite (OMMT) nanocomposites based on the use of catalytic carbonation system OMMT / nickel compounds to further improve the composite material flame retardant properties, combined with elemental analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM) combustion residue analysis of composite materials, Finally, the experimental results and the theoretical analysis, the flame retardant mechanism. HIPS / basic nickel carbonate (Ni2 (OH) 2CO3), HIPS / nickel sulfate (of NiSO4), HIPS / nickel chloride (NiCl2) the HIPS / nickel oxide (NiO) the combustion properties of the composite, cone calorimeter the instrument results show that four nickel compounds added separately to the HIPS can play a certain role in flame-retardant, composite, digital camera and SEM observations showed that combustion residue HIPS/NiSO4 HIPS / NiO composite combustion process to form relatively compact carbon layer. NiSO4 and NiO HIPS / OMMT composite flame retardant properties further comparison, cone calorimeter test results show that the NiO and OMMT mixed further improve the flame retardant properties of the composite materials, digital cameras and SEM composite Materials combustion residue, observations show that compared and NiSO4, NiO and OMMT strong interaction occurs, the formation of the carbon layer is more dense. Focus on the flame retardant properties of HIPS / OMMT / NiO composite, a detailed examination of the impact of NiO HIPS / OMMT composite flame retardant properties, and X-ray diffraction and TEM results show HIPS molecular chain with MMT formation the interpolation layer and the peeling of the composite structure, NiO in the composite material exists in the form of a nano-scale particles, a particle size ranging from 20nm to 300nm, NiO not destroy the interpolation layer and the peeling of the composite material structure. The cone calorimeter Results of OMMT / NiO complex system to further reduce the heat release rate of HIPS composites, substantial increase in the mass fraction of combustion residue, flame retardant properties superior to only add the same mass fraction of OMMT composites , OMMT NiO showed Retardants role in the polymer matrix for EVA and PBt found similar into charcoal to promote and flame retardant. The elemental analysis results show that HIPS added alone NiO and OMMT burning the elemental carbon in the residue rarely OMMT and NiO complex with substantially increased the content of the carbon element, and with the increase in the amount of OMMT and NiO increase , SEM and TEM observation results showed that the HIPS / OMMT / NiO composite material of the carbon material for the growth is not completely nano carbon fibers and carbon black particles. Combined SEM combustion residue analysis of the morphology and structure of the composite of HIPS / OMMT / NiO composite flame retardant possible mechanism that three-dimensional network of pore structure of the combustion process unique nanoscale spherical NiO particles filling montmorillonite the formation of a significant role of its carbon and flame retardant properties to improve the main reason.

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