Abstract
Two metallic ferrites LaFeO3 and BiFeO3 were successfully synthesized and compared with ZnFe2O4 used as flame retardants and smoke suppressants for flexible poly(vinyl chloride) (PVC). The flame-retardant and smoke-suppressant properties of flame-retarded PVC were evaluated using the limiting oxygen index, smoke density rating, and cone calorimeter tests. The results indicate that BiFeO3 is an excellent flame retardant and smoke suppressant for flexible PVC. Under 30 kW m−2 radiation, the peak value of heat release rate of 20 phr PVC/BiFeO3 was reduced by 44.8 % as compared to neat PVC, and the total smoke produced and average specific extinction area of 20 phr PVC/BiFeO3 were reduced by 54.8 and 52.3 %, respectively. The char residues of the PVC samples were analyzed by SEM and Raman spectra, which suggested the incorporation of ferrites can induce the formation of char layer. This effect combined with the gaseous phase effect of BiFeO3, and hence PVC/BiFeO3 has the best flame-retardant and smoke-suppressant properties.
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References
Starnes WH Jr. Structural and mechanistic aspects of the thermal degradation of poly(vinyl chloride). Prog Polym Sci. 2002;27:2133–70.
Basfar AA. Flame retardancy of radiation cross-linked poly(vinyl chloride) (PVC) used as an insulating material for wire and cable. Polym Degrad Stab. 2002;77:221–6.
Coaker AW. Fire and flame retardants for PVC. J Vinyl Addit Technol. 2003;9:108–15.
Levchik SV, Weil ED. Overview of the recent literature on flame retardancy and smoke suppression in PVC. Polym Adv Technol. 2005;16:707–16.
Starnes WH Jr, Pike RD, Cole JR, Doyal AS, Kimlin EJ, Lee JT, Murray PJ, Quinlan RA, Zhang J. Cone calorimetric study of copper-promoted smoke suppression and fire retardance of poly(vinyl chloride). Polym Degrad Stab. 2003;82:15–24.
Rodolfo A Jr, Mei LHI. Metallic oxides as fire retardants and smoke suppressants in flexible poly(vinyl chloride). J Appl Polym Sci. 2010;118:2613–23.
Pi H, Guo SY, Ning Y. Mechanochemical improvement of the flame-retardant and mechanical properties of zinc borate and zinc borate–aluminum trihydrate-filled poly(vinyl chloride). J Appl Polym Sci. 2003;89:753–62.
Qu HQ, Wu WH, Zheng YJ, Xie JX, Xu JZ. Synergistic effects of inorganic tin compounds and Sb2O3 on thermal properties and flame retardancy of flexible poly(vinyl chloride). Fire Saf J. 2011;46:462–7.
Xu JZ, Liu CH, Qu HQ, Ma HY, Jiao YH, Xie JX. Investigation on the thermal degradation of flexible poly(vinyl chloride) filled with ferrites as flame retardant and smoke suppressant using TGA–FTIR and TGA–MS. Polym Degrad Stab. 2013;98:1506–14.
Qu HQ, Liu CH, Wu WH, Chen LZ, Xu JZ. Using cone calorimeter to study thermal degradation of flexible PVC filled with zinc ferrite and Mg(OH)2. J Therm Anal Calorim. 2014;115:1081–7.
Bharti DC, Mukherjee K, Majumder SB. Wet chemical synthesis and gas sensing properties of magnesium zinc ferrite nano-particles. Mater Chem Phys. 2010;120:509–17.
Yang X, Zhang YF, Xu G, Wei X, Ren ZH, Shen G, Han GR. Phase and morphology evolution of bismuth ferrites via hydrothermal reaction route. Mater Res Bull. 2013;48:1694–9.
Thirumalairajan S, Girija K, Ganesh V, Mangalaraj D, Viswanathan C, Ponpandian N. Novel synthesis of LaFeO3 nanostructure dendrites: a systematic investigation of growth mechanism, properties, and biosensing for highly selective determination of neurotransmitter compounds. Cryst Growth Des. 2013;13:291–302.
Kim J, Lee JH, Kim S. Estimating the fire behavior of wood flooring using a cone calorimeter. J Therm Anal Calorim. 2012;110:677–83.
Xu Q, Majlingova A, Zachar M, Jin C, Jiang Y. Correlation analysis of cone calorimetry test data assessment of the procedure with tests of different polymers. J Therm Anal Calorim. 2012;110:65–70.
Pike RD, Starnes WH Jr, Jeng JP, Bryant WS, Kourtesis P, Adams CW. Low-valent metals as reductive cross-linking agents: a new strategy for smoke suppression of poly(vinyl chloride). Macromolecules. 1997;30:6957–65.
Feng J, Hao JW, Du JX, Yang RJ. Using TGA/FTIR TGA/MS and cone calorimetry to understand thermal degradation and flame retardancy mechanism of polycarbonate filled with solid bisphenol A bis(diphenyl phosphate) and montmorillonite. Polym Degrad Stab. 2012;97:605–14.
Wang XL, Song Y, Bao JC. Synergistic effects of ZrO2 or B2O3 on flame-retarded poly (butyl methacrylate) with tricresylphosphate. Fire Mater. 2010;34:357–66.
Qian Y, Wei P, Jiang PK, Zhao XM, Yu HZ. Synthesis of a novel hybrid synergistic flame retardant and its application in PP/IFR. Polym Degrad Stab. 2011;96:1134–40.
Ferrari AC, Robertson J. Interpretation of Raman spectra of disordered and amorphous carbon. Phys Rev B. 2000;61:14095–107.
Fina A, Abbenhuis HCL, Tabuani D, Camino G. Metal functionalized POSS as fire retardants in polypropylene. Polym Degrad Stab. 2006;91:2275–81.
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The work was financially supported by the Natural Science Foundation of China (Grant Nos. 21306035 and 21276059).
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Han, L., Wu, W., Qu, H. et al. Metallic ferrites as flame retardants and smoke suppressants in flexible poly(vinyl chloride). J Therm Anal Calorim 123, 293–300 (2016). https://doi.org/10.1007/s10973-015-4855-y
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DOI: https://doi.org/10.1007/s10973-015-4855-y