Novel Poly(urethane-amide) s from Polyurethane Prepolymer and Reactive Polyamide. Preparation and Properties.

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A series of novel poly(urethane-amide)s were prepared by a reaction of a polyurethane (PU) prepolymer and a soluble polyamide (PA) containing aliphatic hydroxyl group in the backbone. PU prepolymer was prepared by a reaction of polyester polyol and 2,4-tolylenediisocyanate and then end-capped with phenol. Soluble PA was prepared by a reaction of 1-(m-aminophenyl)-2-(p-aminophenyl)ethanol and 4,4’-oxydibenzoyl chloride. PU prepolymer and PA were mixed in various weight ratios, and the blend solutions were cast on glass substrates. The cast films were thermally treated at various temperatures, which allowed the release of phenol. The regenerated isocyanate group in the PU prepolymer reacted with hydroxyl group in the PA, giving a series of white opaque poly(urethane-amide) films. By changing the ratio of PU and PA, poly(urethane-amide) films having various properties from plastic to elastomer were prepared. Dynamic mechanical analysis showed two glass transition temperatures, one for the PU component at lower temperature range and the other for the PA component at higher temperature range, suggesting that the two polymer components were phase separated. When PU component was more than 80 wt%, the films had the properties of elastomer. The rubbery plateaus region of the storage modulus for the elastic films was broad and continued up to ca. 200°C. Tensile measurements showed that the elongation was 326% for the elastic film of PU/PA = 90/10. Thermogravimetric analyses indicated that the thermal degradation of poly(urethane-amide) occurs at ca. 280°C. These indicated that the introduction of PA component containing aliphatic alcohol in the backbone improved the thermal properties, and thus enhanced the use temperature of PU.

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  • Polymer Journal

    Polymer Journal 34 (6), 455-460, 2002

    The Society of Polymer Science, Japan

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