Synthesis, mechanical properties and fire behaviors of rigid polyurethane foam with a reactive flame retardant containing phosphazene and phosphate

Reactive flame retardant hexa-(phosphite-hydroxyl-methyl-phenoxyl)-cyclotriphosphazene (HPHPCP) was synthesized by hexachlorocyclotriphosphazene, diethyl phosphite and p-hydroxybenzaldehyd. Flame retardant rigid polyurethane foams (FR-RPUFs) were prepared by free foaming with incorporating HPHPCP wi...

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Bibliographic Details
Published inPolymer degradation and stability Vol. 122; pp. 102 - 109
Main Authors Yang, Rong, Hu, Wentian, Xu, Liang, Song, Yan, Li, Jinchun
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2015
Subjects
chemical structure
Fire behavior
Flame retardant
flame retardants
foaming
heat
mechanical properties
nuclear magnetic resonance spectroscopy
oxygen
phosphates
phosphorus
polyesters
polyols
polyurethanes
Rigid polyurethane foam
stable isotopes
Synthesis
thermal stability
Rigid polyurethane foam
Flame retardant
Fire behavior
Synthesis
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Summary:Reactive flame retardant hexa-(phosphite-hydroxyl-methyl-phenoxyl)-cyclotriphosphazene (HPHPCP) was synthesized by hexachlorocyclotriphosphazene, diethyl phosphite and p-hydroxybenzaldehyd. Flame retardant rigid polyurethane foams (FR-RPUFs) were prepared by free foaming with incorporating HPHPCP with polyether polyol, polyester polyol and polymethylene polyphenyl isocyanate. The chemical structure of HPHPCP was characterized by proton and 31P nuclear magnetic resonance. The morphology, physical–mechanical properties, thermal stability and flame-retardant performance of rigid polyurethane foam (RPUF) and FR-RPUFs were investigated. Results suggested that the incorporation of HPHPCP into RPUF enhance the density, comprehensive strength and thermal stability as a result of higher crosslink concentration resulting from the multifunctional group of HPHPCP. Furthermore, with the increase of HPHPCP content, the limiting oxygen index (LOI) increased along with the gradually decreased values of the second peak heat release rate (PHRR2). In addition, when the additive of HPHPCP was higher than 10 wt%, FR-RPUFs pass UL-94 HF-1 rating and the flame spread limited simultaneously, indicating the reinforced and flame-retardant RPUFs could be obtained.
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ISSN:0141-3910
DOI:10.1016/j.polymdegradstab.2015.10.007