International audienceA series of new ,-dihydroxy terminated polyester oligomers are synthesized from the condensation reaction of various aliphatic diols with a mixture of diacids rich in 2-methylglutaric acid, MGA, an abundant and well-defined industrial product. Their adipic acid (AA)-based counterparts are also prepared and the physico-chemical properties of both types of polyols are thoroughly characterized. All these polyester polyols are then used to prepare segmented polyurethanes following a two-stage process, by reacting them successively with 4,4-diphenylmethane diisocyanate, and 1,4-butanediol. The resulting materials are then evaluated with respect to their thermal and dynamic or static mechanical properties. The observed characteristics and behaviors are quite similar between AA- or MGA-based polyurethanes, except for the tendency of AA-based samples to display partially crystallized soft domains. Such a phenomenon is prevented in MGA-based samples because of the methyl side group, resulting in remarkably higher ultimate elongations for the new thermoplastic polyurethanes derived from MGA
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