TY - EJOU AU - Begines, Belén AU - Zamora, Francisca AU - Paz, M. Violante de AU - Roffé, Isaac AU - Mancera, Manuel AU - Galbis, Juan A. TI - Synthesis and Characterization of New Carbohydrate-based Polyureas T2 - Journal of Renewable Materials PY - 2013 VL - 1 IS - 3 SN - 2164-6341 AB - A batch of linear [m,n]-type sugar-based polyureas was synthesized by polyaddition reaction in solution from hexamethylene diisocyanate or 4,4’-methylene-bis(phenyl isocyanate) with the acyclic 2,3,4-tri-O-methyl-1,5- diamino-alditols having L-arabino, or xylo confi guration or the bicyclic 1,6-diamino-1,6-dideoxy-2,4:3,5-diO-methylene-D-glucitol. The polymers were obtained in good yields and fair molecular weights. All these polyureas were semicrystalline materials showing well-defi ned melting transition within the 86−171°C range, with Tg s being dependent on the aliphatic or aromatic nature of the diisocyanate used, and on the cyclic or acyclic chemical structure of the sugar moiety. They were found to be stable up to around 240°C, decomposing at higher temperatures through a one- or two-stage mechanism. KW - Polyureas KW - sugar-based monomers KW - hydrophilic polymers KW - thermal properties DO - 10.7569/JRM.2013.634119