Papers by Author: Zheng Zhou Wang

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Authors: Jian Wei Yang, Zheng Zhou Wang, Li Xin Wu, Dong Xian Zhuo
Abstract: Graphene nanoplatelets (GNP) were prepared by ball milling, and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). PS/GNP composites were produced by a melt process. The flammability of PS/GNP composite was evaluated by the cone calorimeter (Cone) and thermal degradation of the composite by thermogravimetric analyses (TGA). Cone data indicate that the incorporation of 1% GNP leads to a 28% reduction in the peak heat release rate (PHRR) compared to pure PS. There is an synerhistic effect between intumesent flame retardants and GNP in a decrease in PhRR in PS. The incorporation of small amount of GNP can improve thermal stability of PS.
Authors: Zheng Zhou Wang, Lin Liu, Gan Xin Jie, Ping Kai Jiang
Abstract: Flame retarded ethylene-vinyl acetate copolymer (EVA) was prepared in a melt process containing melamine phosphate (MP), or MP in combination with dipentaerythritol (DPER) as flame retardants. The influence of MP and MP/DPER on flame retardant properties of EVA was investigated by limiting oxygen index (LOI) and UL 94 test. Thermal decomposition of the flame retardants and flame retarded EVA composites was studied by the thermogravimetric analysis. The results show that MP used alone in EVA does not exerts good flame retardancy, even at a loading of 50wt%. It is found that the flame retardant properties of the EVA/MP/DPER composites is greatly improved when a suitable amount of MP substituted by DPER. Moreover, mechanical properties of the EVA composites were studied.
Authors: Zheng Zhou Wang, Zhong Qian Gu, Ping Kai Jiang
Abstract: Flame retardation of PP/EPDM blend containing ammonium polyphosphate or its microcapsule (MFAPP) combined with dipentaerythritol (DPER) was evaluated by LOI and UL -94 methods. It is found that MFAPP is better than APP in exerting flame retardation in the PP/EPDM. No apparent improvement in flame retardation for APP and MFAPP in combination with DPER in the PP/EPDM blend. SEM results show that microencapsulation of APP with the melamine–formaldehyde resin leads to some improvement in its dispersion in the blend. Moreover, mechanical properties of the flame retarded PP/EPDM composites are studied.
Authors: Zheng Zhou Wang, Yi Ren Huang
Abstract: Flame retardant properties of ammonium polyphosphate (APP) and its two kinds of microcapsules, MFAPP with a shell of MF resin and EPAPP with a shell of epoxy resin, were studied in styrene-butadiene-styrene rubber (SBS). The results indicate that the microencapsulation of APP leads to an increase in LOI in SBS compared with APP. When dipentaerythritol is incorporated into the SBS composites containing APP microcapsules, a further improvement in flame retardancy of the composites is observed. Moreover, thermal decomposition behavior and mechanical properties of the SBS composites are investigated.
Authors: Zheng Zhou Wang, Shao Hong Xu
Abstract: Flammability of polypropylene/vinyl acetate copolymer (PP/EVA) composites containing melamine phosphate (MP) and pentaerythritol (PER) was studied by limiting oxygen index (LOI), and UL 94. It is found that the LOI values decrease with the increase of EVA content in the PP/EVA composites. The thermal decomposition were investigated by thermogravimetric analysis. Moreover, the mechanical properties of the PP/EVA composites were studied. Compared with the flame retarded PP/EVA composites, the incorporation of a small amount of the peroxide (DCP) into the flame retarded composites leads to an increase in both tensile properties and flame retardancy.
Authors: Shao Hong Xu, Xiao Yu Sui, Zheng Zhou Wang
Abstract: Flammability of toughened phenolic (PF) foams containing ammonium polyphosphate (APP), melamine phosphate (MP) or melamine cyanurate(MCA) was studied by limiting oxygen index (LOI). The LOI values show that APP or MP is an effient flame retardant than MCA in the toughened PF foams. The thermal decomposition and mechanical properties of the phenolic foams were also investigated.
Authors: Zheng Zhou Wang, Charles A. Wilkie
Abstract: Cadmin sulfate nanoparticles, hollow sphere (CdS-HS) and rode (CdS-NR) were synthesized by ultrasonic and solvothermal process, respectively. The effect of the two kinds of nanoparticles on flammability of polystyrene was investigated using cone calorimeter (Cone) and microscale combustion calorimeter (MCC). Cone data indicate that the incorporation of 1% CdS nanoparticles leads to a about 20% reduction in the peak heat release rate (PHRR) compared to the pure PS; CdS-NR is more efficient in reducing the PHRR proved by both Cone and MCC results. The TG results show that the addition of the nanoparticles mainly increases thermal stability of PS at high temepratures.
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