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Effect of different carboxylic acid group contents on microstructure and properties of waterborne polyurethane dispersions

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Abstract

The waterborne polyurethane (WPU) with different carboxylic acid group contents were prepared by a prepolymer method, adopting polycarbonate diol (PCDL) as soft segments and isophorone diisocyanate (IPDI) as hard segments. The different amounts of 2,2-dimethylolbutyric acid (DMPA) as hydrophilic chain extender were introduced into polyurethane molecular for studying the effect on microstructure and properties. The solid content, pH value and viscosity measurement were used to characterize the performance of WPU emulsion. The fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric (TG), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), water contact angle tester and mechanical testing machine were utilized to measure the structure, crystallization performance, thermal stability, low temperature flexibility, wetting performance and mechanical properties of WPU films, respectively. The test value of impact, adhesive, flexibility and pencil hardness on tinplate of WPU coatings were obtained for observing film properties. The results indicated that the emulsification effect increase with the increased DMPA contents. The decomposition temperature of WPU films perform a slight decrease and the WPU films have excellence low temperature flexibility with the increased DMPA contents. The hydrophilic property of WPU films mainly are about 80°and the tensile strength value of 7 wt% WPU reaches 45 MPa and elongation at break at 420%.

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Acknowledgements

The authors wish to thank for the Sichuan University of Science and Engineering Talent Introduction Project (No.2016RCL35), the Innovation Fund of Postgraduate (Y2018045) Sichuan University of Science & Engineering, Provincial College Students’ Innovation and Entrepreneurship Training Program (201810622036), Opening Project of Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities (2018JXY04) and Major Project of Education Department in Sichuan (18ZA0346).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province, Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities, Sichuan University of Science & Engineering, Zigong, 643000, China

    Linqing Hu, Zejun Pu, Yueqi Zhong, Linze Liu, Jie Cheng & Jiachun Zhong

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  1. Linqing Hu
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  2. Zejun Pu
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Linqing Hu and Zejun Pu contributed equally to this work, and they are the co-first author. Besides, all the authors approved the final version of the manuscript.

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Correspondence to Zejun Pu or Jiachun Zhong.

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Hu, L., Pu, Z., Zhong, Y. et al. Effect of different carboxylic acid group contents on microstructure and properties of waterborne polyurethane dispersions. J Polym Res 27, 129 (2020). https://doi.org/10.1007/s10965-020-02125-1

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