Role of chain symmetry and hydrogen bonding in segmented copolymers with monodisperse hard segments |
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Authors: | Jignesh P Sheth Derek B Klinedinst Iskender Yilgor |
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Affiliation: | a Department of Chemical Engineering, Virginia Polytechnic Institute and State University, 133 Randolph Hall (0211), Blacksburg, VA 24061, USA b Department of Chemistry, Koc University, Istanbul 34450, Turkey |
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Abstract: | Thermoplastic segmented polyurethane and polyurea copolymers whose monodisperse hard segments are based on only a single diisocyanate molecule are discussed. The solid-state structure-property behavior of these materials demonstrates that a proper selection of the level of symmetry and/or cohesiveness of the hard microdomains may allow elimination of the traditional requirement of chain extension to obtain melt processable segmented urethanes, and more specifically, urea copolymers with useful structural properties. |
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Keywords: | Polyurea Polyurethane Segmented copolymers |
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