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Licensed Unlicensed Requires Authentication Published by De Gruyter June 1, 2022

Influence of ammonium octamolybdate on flame retardancy and smoke suppression of PVC matrix flame retardant composites

Jianlin Xu, Chengsi Li, Shibo Ren, Lei Niu, Qingwen Bai and Xiang Li


In order to improve the flame retardancy and smoke suppression of polyvinyl chloride (PVC), ammonium octamolybdate (AOM)/nano-antimony trioxide (nano-Sb2O3)/dioctyl Phthalate (DOP)/PVC composites were prepared by high energy ball milling and melt blending methods using AOM as the smoke suppressant. The effects of AOM on the flame retardancy and smoke suppression of the PVC composites were studied by means of vertical burning tests (UL-94), limiting oxygen index (LOI), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and cone calorimetry (CCT). The results showed that the flame retardancy of PVC composites containing AOM was improved, namely the UL-94 grade of the composites reached the V-0 grade and the LOI increased from 22.3% to 30.6%, whilst the heat release rate (HRR), total heat release (THR), smoke production rate (SPR), total smoke production (TSR) and smoke factor (SF) decreased significantly. In addition, AOM could promote the dehydrochlorination reaction of the PVC composites at lower temperature, resulting in more compact and continuous char residues. Therefore, AOM is an effective smoke suppressant and has a good synergistic flame retardant effect with nano-Sb2O3 in flame retardant PVC matrix composites.

Corresponding author: Jianlin Xu, College of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China; and State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, P. R. China, E-mail:

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 51761025

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The work was supported by the National Natural Science Foundation of China [No. 51761025].

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.


Almeras, X., Le Bras, M., Hornsby, P., Bourbigot, S., Marosi, G., Keszei, S., and Poutch, F. (2003). Effect of fillers on the fire retardancy of intumescent polypropylene compounds. Polym. Degrad. Stab. 82: 325–331, in Google Scholar

Borukaev, T.A., Kharaev, A.M., Shaov, A.K., Borodulin, A.S., and Kalinnikov, A.N. (2020). Improving the fire resistance of PVC plastic the introduction ammonium octamolybdate. In IOP conf. ser.: mater. sci. eng, Vol. 709, pp. 1–6.10.1088/1757-899X/683/1/012052Search in Google Scholar

Carty, P., White, S., Price, D., and Lu, L. (1999). Smoke-suppression in plasticised chlorinated poly (vinyl chloride)(CPVC). Polym. Degrad. Stab. 63: 465–468, in Google Scholar

Cassuto, J. and Tarnow, P. (2003). The discotheque fire in Gothenburg 1998: a tragedy among teenagers. Burns 29: 405–416, in Google Scholar

Chen, X. and Jiao, C. (2011). Flame retardancy and thermal degradation of intumescent flame retardant polypropylene material. Polym. Adv. Technol. 22: 817–821, in Google Scholar

Chen, S.Q., Xiong, L., Pi, H., Chen, G.S., and Guo, S.Y. (2007). Smoke suppression of thermal stabilizers on PVC and its mechanism. Polym. Mater. Sci. Eng. 23: 206–210, in Google Scholar

Chen, X., Li, M., Zhuo, J., Ma, C., and Jiao, C. (2016). Influence of Fe2O3 on smoke suppression and thermal degradation properties in intumescent flame-retardant silicone rubber. J. Therm. Anal. Calorim. 123: 439–448, in Google Scholar

Cogen, J.M., Lin, T.S., and Lyon, R.E. (2009). Correlations between pyrolysis combustion flow calorimetry and conventional flammability tests with halogen-free flame retardant polyolefin compounds. Fire Mater. 33: 33–50, in Google Scholar

Dang, L., Lv, Z., Du, X., Tang, D., Zhao, Y., Zhu, D., and Xu, S. (2020). Flame retardancy and smoke suppression of molybdenum trioxide doped magnesium hydrate in flexible polyvinyl chloride. Polym. Adv. Technol. 31: 2108–2121, in Google Scholar

Fang, S., Hu, Y., Song, L., Zhan, J., and He, Q. (2008). Mechanical properties, fire performance and thermal stability of magnesium hydroxide sulfate hydrate whiskers flame retardant silicone rubber. J. Mater. Sci. 43: 1057–1062, in Google Scholar

Hirschler, M.M. (1991). The measurement of smoke in rate of heat release equipment in a manner related to fire hazard. Fire Saf. J. 17: 239–258, in Google Scholar

Irvine, D.J., McCluskey, J.A., and Robinson, I.M. (2000). Fire hazards and some common polymers. Polym. Degrad. Stab. 67: 383–396, in Google Scholar

Jordan, K.J., Suib, S.L., and Koberstein, J.T. (2001). Determination of the degradation mechanism from the kinetic parameters of dehydrochlorinated poly (vinyl chloride) decomposition. J. Phys. Chem. B 105: 3174–3181, in Google Scholar

Kovács, T.N., Hunyadi, D., de Lucena, A.L.A., and Szilágyi, I.M. (2016). Thermal decomposition of ammonium molybdates. J. Therm. Anal. Calorim. 124: 1013–1021, in Google Scholar

Lattimer, R.P. and Kroenke, W.J. (1981). The functional role of molybdenum trioxide as a smoke retarder additive in rigid poly (vinyl chloride). J. Appl. Polym. Sci. 26: 1191–1210, in Google Scholar

Lattimer, R.P. and Kroenke, W.J. (1982). Mechanisms of formation of volatile aromatic pyrolyzates from poly (vinyl chloride). J. Appl. Polym. Sci. 27: 1355–1366, in Google Scholar

Levchik, S.V. and Weil, E.D. (2005). Overview of the recent literature on flame retardancy and smoke suppression in PVC. Polym. Adv. Technol. 16: 707–716, in Google Scholar

Lum, R.M. (1979). MoO3 additives for PVC: a study of the molecular interactions. J. Phys. Chem. B 23: 1247–1263, in Google Scholar

Molefe, D.M., Labuschagne, J., Focke, W.W., Van der Westhuizen, I., and Ofosu, O. (2015). The effect of magnesium hydroxide, hydromagnesite and layered double hydroxide on the heat stability and fire performance of plasticized poly (vinyl chloride). J. Fire Sci. 33: 493–510, in Google Scholar

Pike, R.D., Starnes, W.H., Jeng, J.P., Bryant, W.S., Kourtesis, P., Adams, C.W., and O’Brien, C.P. (1997). Low-valent metals as reductive cross-linking agents: a new strategy for smoke suppression of poly (vinyl chloride). Macromolecules 30: 6957–6965, in Google Scholar

Purser, D.A. (2000). Toxic product yields and hazard assessment for fully enclosed design fires. Polym. Int. 49: 1232–1255,<1232::AID-PI543>3.0.CO;2-T.10.1002/1097-0126(200010)49:10<1232::AID-PI543>3.0.CO;2-TSearch in Google Scholar

Qu, H., Wu, W., Xie, J., and Xu, J. (2011). A novel intumescent flame retardant and smoke suppression system for flexible PVC. Polym. Adv. Technol. 22: 1174–1181, in Google Scholar

Ricciardi, M.R., Antonucci, V., Zarrelli, M., and Giordano, M. (2012). Fire behavior and smoke emission of phosphate-based inorganic fire-retarded polyester resin. Fire Mater. 36: 203–215, in Google Scholar

Sadat-Shojai, M. and Bakhshandeh, G.R. (2011). Recycling of PVC wastes. Polym. Degrad. Stab. 96: 404–415, in Google Scholar

Schartel, B. and Hull, T.R. (2007). Development of fire-retarded materials—interpretation of cone calorimeter data. Fire Mater. 31: 327–354, in Google Scholar

Xu, K.M., Li, K.F., Deng, Y.P., Yan, X., and Xie, C.P. (2012). Effect of inorganic flame retardant on the properties of wood/PVC composites. Adv. Mater. Res 1601: 110–114, in Google Scholar

Xu, J.L., Zhou, S.G., Niu, L., Feng, C., Yang, W.L., and Dan, X.M. (2015). Preparation and flame retardancy of Sb2O3/polyvinyl chloride composites. Trans. Mater. Heat Treat 36: 1–6, in Google Scholar

Xu, J., Kang, C., Niu, L., Xu, C., and Ren, S. (2019). Study on the properties of the Sb2O3 nanoparticles modified by different surfactants. Mater. Res. Express. 6: 1–15, in Google Scholar

Xu, J.L., Lin, Y.G., Yang, W.L., Kang, C.H., and Niu, L. (2020a). Application of nanometer antimony trioxide modified by dioctyl phthalate in polyvinyl chloride flame retardant materials. Mater. Res. 23: 1–10, in Google Scholar

Xu, Z., Duan, L., Hou, Y., Chu, F., Jiang, S., Hu, W., and Song, L. (2020b). The influence of carbon-encapsulated transition metal oxide microparticles on reducing toxic gases release and smoke suppression of rigid polyurethane foam composites. Composites Part A 131: 1–9, in Google Scholar

Yang, W., Xu, J., Niu, L., Kang, C., and Ma, B. (2018). Effects of high energy ball milling on mechanical and interfacial properties of PBT/nano-Sb2O3 composites. J. Adhes. Sci. Technol. 32: 291–301, in Google Scholar

Zhang, Z.H., Zhang, Z., Yan, C.M., Li, J.W., and Zhou, Y.L. (2006). Flame Retardance,Smoke suppression and pyrolysis of rigid PVC modified by molybdenum trioxide composite. China. Plast. 20: 77–80, in Google Scholar

Zhang, F., Chen, P., Wang, Y., and Li, S. (2016). Smoke suppression and synergistic flame retardancy properties of zinc borate and diantimony trioxide in epoxy-based intumescent fire-retardant coating. J. Therm. Anal. Calorim. 123: 1319–1327, in Google Scholar

Zhang, B., Liu, H., and Han, J. (2017). Zinc hydroxystannate microencapsulated to improve its safety and application to flame-retardant, smoke-suppressed polyvinyl chloride composites. J. Alloys Compd. 712: 768–780, in Google Scholar

Zhang, M., Wu, W., He, S., Wang, X., Jiao, Y., Qu, H., and Xu, J. (2018). Synergistic flame retardant effects of activated carbon and molybdenum oxide in poly (vinyl chloride). Polym. Int. 67: 445–452, in Google Scholar

Received: 2022-01-26
Accepted: 2022-05-07
Published Online: 2022-06-01
Published in Print: 2022-07-26

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