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Polymers 2016, 8(9), 322; doi:10.3390/polym8090322

Flame Retardancy of Sorbitol Based Bioepoxy via Combined Solid and Gas Phase Action

Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
Author to whom correspondence should be addressed.
Academic Editors: Baljinder Kandola, Abderrahim Boudenne and Paul Kiekens
Received: 7 June 2016 / Revised: 6 July 2016 / Accepted: 24 August 2016 / Published: 30 August 2016
(This article belongs to the Special Issue Recent Advances in Flame Retardancy of Textile Related Products)
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Flame-retarded bioepoxy resins were prepared with the application of commercially available sorbitol polyglycidyl ether (SPE). The additive-type flame retardancy of the cycloaliphatic amine-cured SPE was investigated. Three-percent phosphorus (P)-containing samples were prepared with the application of the liquid resorcinol bis(diphenyl phosphate) (RDP), the solid ammonium polyphosphate (APP), and by combining them. Synergistic effect was found between the inorganic APP and the organophosphorus RDP, when applied in combination: formulations applying RDP or APP alone showed increased limiting oxygen index (LOI) values, however, their UL-94 standard ratings remained HB. When the same amount of P originated from the two additives, V-0, self-extinguishing rating and LOI value of 34% (v/v) was reached. By the combined approach the heat release rate of SPE could be lowered by approximately 60%. The assumed balanced solid and gas phase mechanism was confirmed by thermogravimetric analysis, Fourier transform infrared spectrometry (FTIR) analysis (of the gases formed during laser pyrolysis), attenuated total reflection-infrared spectrometry (ATR-IR) analysis (of the charred residues), as well as by mechanical testing (of the char obtained after combustion). View Full-Text
Keywords: bioepoxy; phosphorous additive FR; solid and gas phase mechanism; laser pyrolysis-FTIR coupled method; TGA bioepoxy; phosphorous additive FR; solid and gas phase mechanism; laser pyrolysis-FTIR coupled method; TGA

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Szolnoki, B.; Bocz, K.; Marosi, G.; Toldy, A. Flame Retardancy of Sorbitol Based Bioepoxy via Combined Solid and Gas Phase Action. Polymers 2016, 8, 322.

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