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Surface morphology of chlorine and castor oil-based polyurethane–urea coatings

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Abstract

The present work deals with surface properties of chlorine containing polyurethane–urea (PU–urea)-coating films. First, isocyanate-terminated pre-polymers were synthesized using castor oil as renewable resource, isophorone diisocyanate, and different weight percentages of 2-chloroethanol and 2,2,2-trichloroethanol. The resultant isocyanate-terminated pre-polymers were cured under atmospheric moisture to obtain chlorine containing PU–urea coatings. The surface properties of the coating films were characterized using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, and X-ray diffraction. All characterization techniques suggest that the presence of chlorine species on the surface results in different surface properties when compared to control PU–urea (without the chlorine group)-coating film surface. The viscoelastic, swelling, and contact angle (CA) properties were studied for the prepared coating films. The glass-transition temperatures (Tg) were obtained in the region 29.2–35 °C for the coating films. Tg increased by increasing the chlorine content in polyurethane-coating formulations. The CA for the coating films was found to be in the range of 76°–64° and these properties were found to be decreased with increase in the weight percent content of the chlorine moiety in the final coating formulation. Similarly, the higher chlorine content-coating films have shown more water uptake properties. The overall comparative results indicate that the chlorine containing PU–urea-coating films have different surface-coating properties and these depend upon the chlorine content in the final coating formulation as compared with PU–urea surfaces.

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Acknowledgements

The authors would like to thank Council of Scientific and Industrial Research (CSIR), New Delhi and Director, CSIR-IICT for financial support in the form of a research fellowship. The present research was supported by CSIR under the Intel-Coat Project (CSC-0114).

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Authors and Affiliations

  1. Polymers and Functional Materials Division, Indian Institute of Chemical Technology, Hyderabad, 500007, India

    Shaik Allauddin, Varaprasad Somisetti, Ramanuj Narayan & Raju V. S. N. Kothapalli

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  1. Shaik Allauddin
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  2. Varaprasad Somisetti
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Correspondence to Raju V. S. N. Kothapalli.

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Allauddin, S., Somisetti, V., Narayan, R. et al. Surface morphology of chlorine and castor oil-based polyurethane–urea coatings. Polym. Bull. 75, 5269–5285 (2018). https://doi.org/10.1007/s00289-018-2319-9

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  • DOI: https://doi.org/10.1007/s00289-018-2319-9

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