Abstract
Conductive composite comprised of carbon black and waterborn polyurethane was prepared by latex blending. It exhibited sensitivity to non-polar solvent vapors and polar solvent vapors as a result of the microphase separation structure of polyurethane. By studying the electrical response and absorption behaviors of the composite in low vapor pressure, a model based on Flory–Huggins principle was proposed to discuss the specific performance of the composite, including selective sensitivity, influences of vapor pressure and test temperature. Interaction between solvent and matrix polymer was proved to determine the maximum magnitude of response of the composite.
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Acknowledgements
The authors would like to thank the financial supports of the Natural Science Foundation of China (Grant 50133020), the Team Project of the Natural Science Foundation of Guangdong (Grant 20003038) and the Talent Training Program Foundation of the Higher Education Department of Guangdong Province.
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Zhao, B., Fu, R.W., Zhang, M.Q. et al. Analysis of gas sensing behaviors of carbon black/waterborne polyurethane composites in low concentration organic vapors. J Mater Sci 42, 4575–4580 (2007). https://doi.org/10.1007/s10853-006-0517-6
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DOI: https://doi.org/10.1007/s10853-006-0517-6