Abstract
A series of relatively high molecular weight poly(ester-urethane-urea)s containing pendant acrylate functionality was synthesized. Poly(ester-urethane-urea-acrylate)s were polymerized in a two step process: synthesis of an isocyanate terminated prepolymers prepared from an excess molar concentration of 4,4′-methylene diphenyl diisocyanate with poly(ester)doils [ Mn∼2000] and reaction of the product with hexamethylenediamine and neutralization with acrylic or metacrylic acid. These curable materials possess good mechanical properties and behave like common thermoplastic elastomers prior to chemical crosslinking which further enhances their strength and insolubilizes them. The cured materials were characterized by stress–strain, IR, and thermogravimetric experiments. It was found that the soft segment unit molecular weight was important in determining the tensile and thermal properties of this material. The crosslinking process depresses crystallization of the soft segments and improves tensile properties. Introducing diamine and acrylic structural units extends the hard urethane segments.
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