Syntheses of epoxyurethane polymers from isocyanate free oligo-polyhydroxyurethane

Polyepoxyurethane polymers were synthesized from PolyHydroxyUrethane (PHU) pre-polymers terminated amine and epoxy multifunctional. In order to ensure this, PHU pre-polymers was synthesized from the reaction between alpha, omega-bis-cyclic-carbonates (poly (propylene)oxide bis-carbonates) and different excess of diamines (ethylenediamine) to terminate these prepolymers by amine with differents chain length. Then, these aminotelechelic PHU oligomers were re-used in formulation with multifunctional epoxy compound (Bisphenol A Diglycidyl Ether, Di-epoxydized Cardanol or Phloroglucinol Tris Epoxy) to synthesize polyepoxyurethane polymers called also hybrid polymers. Firstly, the raw materials were analyzed in order to determine proportion stoichiometry for carbonate/amine and of hybrid materials formulations. Secondly, for the purpose to demonstrate that the reaction carbonate/amine form hydroxyurethane compound, a model study was realized. Then, syntheses and analyzes of prepolymers terminated amine by H-1, C-13 NMR, TGA and DSC was conducted. Once these oligomers analyzed, the hybrid polymers were formulated from epoxy compounds at different temperatures to determine the best cross-linking proceed. Epoxyurethane polymers were characterized by ATG, DSC and measurement of their swelling index and gel content. These materials exhibited glass transition temperature between -5 degrees C and 42 degrees C and a thermal stability above 320 degrees C at 30% of weight loss. (C) 2015 Elsevier Ltd. All rights reserved.