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Photo- and pH-sensitive azo-containing cationic waterborne polyurethane

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Abstract

In this study, a novel photo- and pH-sensitive cationic waterborne polyurethane containing side chain aromatic azo groups (Azo-CWPU) was synthesized by step-growth addition polymerization from polyether polylol, isophorone diisocyanate, N-methyl diethanolamine and a new aromatic azo-containing monomer, 2,2′-(4-((4-ethylphenyl)diazenyl)phenylazanediyl)diethanol (EDPD). Azo-CWPU showed a significant hypsochromic contrast to the azo monomer and rapid changes in UV–Vis absorption spectra at different irradiation times. Azo-CWPU dispersion displays bright yellow, orange and red color with the change of pH values. Regarding the orange dispersion, we assume that there is a mixture of the azoic form and the hydrazone form. Compared to cationic waterborne polyurethane dispersion without aromatic azo groups (CWPU), Azo-CWPU dispersion with smaller hydrodynamics radius and more narrow distribution shows good thermodynamic properties of polyurethane.

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Acknowledgments

Financial supports from the National High Technology Research and Development Program of China (No. 2014AAQ00294) and the National Natural Science Foundation of China (No. 51073144) are acknowledged. We thank Dr Feng Jiang for his artwork support and discussions.

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Authors and Affiliations

  1. CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, Anhui, China

    Junpei Li, Xingyuan Zhang, Wei Sun, Huaiwei Wang & Kunpeng Wang

  2. Departüment of Forensic and Analytical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK

    James Gooch

Authors
  1. Junpei Li
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  2. Xingyuan Zhang
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  3. James Gooch
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  4. Wei Sun
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  5. Huaiwei Wang
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  6. Kunpeng Wang
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Correspondence to Xingyuan Zhang.

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Li, J., Zhang, X., Gooch, J. et al. Photo- and pH-sensitive azo-containing cationic waterborne polyurethane. Polym. Bull. 72, 881–895 (2015). https://doi.org/10.1007/s00289-015-1312-9

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  • DOI: https://doi.org/10.1007/s00289-015-1312-9

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