Preparation and characterization of waterborne poly(urethane urea) with well-defined hard segments

Authors

  • Dong Ya Yang,

    1. Key Laboratory for Ultrafine Materials, Ministry of Education, Shanghai 200237, People's Republic of China
    2. School of Materials Science and Engineering, East China University of Science and Technology,Shanghai 200237, People's Republic of China
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  • Chun Pu Hu,

    Corresponding author
    1. Key Laboratory for Ultrafine Materials, Ministry of Education, Shanghai 200237, People's Republic of China
    2. School of Materials Science and Engineering, East China University of Science and Technology,Shanghai 200237, People's Republic of China
    • Key Laboratory for Ultrafine Materials, Ministry of Education, Shanghai 200237, People's Republic of China

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  • Sheng Kang Ying

    1. Key Laboratory for Ultrafine Materials, Ministry of Education, Shanghai 200237, People's Republic of China
    2. School of Materials Science and Engineering, East China University of Science and Technology,Shanghai 200237, People's Republic of China
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  • This article is part of a basic research project for nanomaterials sponsored by the Scientific and Technological Committee of Shanghai (project number 0212nm008).

Abstract

A series of polyester-based poly(urethane urea) (PUU) aqueous dispersions with well-defined hard segments were prepared from polyester polyol, 4,4′-diphenylmethane diisocyanate, dimethylolpropionic acid, 1,4-butanediol, isophorone diisocyanate, and ethylenediamine. These anionic-type aqueous dispersions had good dispersity in water and were stable at the ambient temperature for more than 1 year. For these aqueous dispersions, the particle size decreased as the hard-segment content increased, and the polydispersity index was very narrow (<1.10). Films prepared with the PUU aqueous dispersions exhibited excellent waterproof performance: the amount of water absorption was as low as 5.0 wt %, and the contact angle of water on the surface of this kind of film was as high as 103° (this led to a hydrophobic surface). The water-resistant property of these waterborne PUU films could be well correlated with some crystallites and ordered structures of the well-defined hard segments formed by hydrogen bonding between the urethane/urethane groups and urethane/ester groups, as well as the degree of microphase separation between the hard and soft segments in the PUU systems. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 2606–2614, 2005

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