Open Access

ARTICLE

Synthesis and Characterization of New Carbohydrate-based Polyureas

by

Department of Organic and Pharmaceutical Chemistry, School of Pharmacy, University of Seville, 41012-Seville, Spain

* Corresponding Author:

Journal of Renewable Materials 2013, 1(3), 212-221. https://doi.org/10.7569/JRM.2013.634119

Received 09 May 2013; Accepted 05 June 2013;

Abstract

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 T_g 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.

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