Puyadena, M.Etxeberria, I.Martin, L.Mugica, A.Agirre, A.Cobos, M.Gonzalez, A.Barrio, A.Irusta, L.2022-09Puyadena , M , Etxeberria , I , Martin , L , Mugica , A , Agirre , A , Cobos , M , Gonzalez , A , Barrio , A & Irusta , L 2022 , ' Polyurethane/acrylic hybrid dispersions containing phosphorus reactive flame retardants as transparent coatings for wood ' , Progress in Organic Coatings , vol. 170 , 107005 , pp. 107005 . https://doi.org/10.1016/j.porgcoat.2022.1070050033-0655researchoutputwizard: 11556/1375Publisher Copyright: © 2022 The AuthorsPhosphorus modified polyurethane/acrylic hybrid dispersions were prepared for flame retardant transparent wood coatings. The polymerisation was carried out in three steps. In the first one, the polyurethane was synthesised using an acrylic monomer as solvent. The second step involved water addition that promoted the phase inversion and lastly, acrylic part was polymerised. The phosphorous compounds were covalently linked to polyurethane using a phosphorylated polyol and to the acrylic phase using an acrylic phosphate. Polymerisation was monitored by FTIR and NMR and the molar mass of the hybrids was measured by AF4 and SEC. The effects of the phosphorus in fire-retardant properties were analysed by thermogravimetry and pyrolysis combustion flow calorimetry. The introduction of phosphorus did not produce significant changes in the polymerisation process but promoted the cross-linking of the coatings. The coated wood samples maintained the transparency and good properties with the introduction of phosphorus and presented a slight reduction in the Peak Heat Release Rate measured by cone calorimeter. The action of phosphorus as a fire retardant was effective as it gave rise to significant reduction of the CO and CO2 peaks.13586822enginfo:eu-repo/semantics/openAccessjournal article10.1016/j.porgcoat.2022.107005Waterborne polyurethane/acrylic dispersionsPhosphorous polyolPhosphorous acrylateFire retardantWaterborne polyurethane/acrylic dispersionsPhosphorous polyolPhosphorous acrylateFire retardantGeneral Chemical EngineeringSurfaces, Coatings and FilmsOrganic ChemistryMaterials ChemistryFunding InfoThe funding received from University of the Basque Country (GIU19/077, predoctoral grant of M. Puyadena and postdoctoral grant of M. Cobos) and the Basque Government (IT1313-19, PIBA20/16) is grate-fully acknowledged. Technical and human support provided by SGIker is also sincerely acknowledged (UPV/EHU/ ERDF, EU)The funding received from University of the Basque Country (GIU19/077, predoctoral grant of M. Puyadena and postdoctoral grant of M. Cobos) and the Basque Government (IT1313-19, PIBA20/16) is grate-fully acknowledged. Technical and human support provided by SGIker is also sincerely acknowledged (UPV/EHU/ ERDF, EU)http://www.scopus.com/inward/record.url?scp=85133480703&partnerID=8YFLogxK