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Mishra V.K.,Institute of Science & Technology for Advanced Studies & Research ISTAR | Mishra V.K.,Sophisticated Instrumentation Center for Applied Research & Testing | Patel K.I.,Institute of Science & Technology for Advanced Studies & Research ISTAR
Journal of Dispersion Science and Technology | Year: 2015

A series of novel water-based UV-curable polyurethane dispersions (UV-PUDs) were synthesized by acetone process with anionic and nonionic stabilization in combination, which can address the requirements of volatile organic compounds (VOCs) directives for both indoor and outdoor applications. The nonionic stabilization was introduced in structure to improve electrolyte stability, shear stability, freeze/thaw stability, etc. The structure of UV-PUDs was characterized by Fourier transform infrared spectroscopy. Molecular weight and molecular weight distribution was characterized by gel permeation chromatography. Particle size was characterized by particle size analyzer. The thermal stability of the cured films was characterized by thermogravimetric analysis, and their performance properties were measured by standard methods. The obtained dispersions were stable for >8 months. It was found that both combinations of anionic and nonionic provide better colloidal stability against electrolytes and shear stability along with comparable performance properties. (Figure presented.). © 2015, Taylor & Francis Group, LLC.


Mishra V.K.,Institute of Science & Technology for Advanced Studies & Research ISTAR | Mishra V.K.,Sophisticated Instrumentation Center for Applied Research & Testing | Patel K.I.,Institute of Science & Technology for Advanced Studies & Research ISTAR
Journal of Dispersion Science and Technology | Year: 2015

Water-based self-emulsifying alkyd resins were prepared from soya oil fatty acid, phthalic anhydride, isophthalic acid, benzoic acid, and polyols with different functionality viz. 2-butyl-2-ethyl-1,3-propane diol, trimethylol propane, pentaerythritol, and di-pentaerythritol. Dimethylol propionic acid was used as internal emulsifier. The resin was neutralized with triethylamine, and finally dispersed in water to obtain water-based self-emulsifying alkyd resins. The effect of functionality of polyols used in synthesis, on various properties of water-based alkyd resins shows that, as the functionality increases surface coating properties viz. drying time, hardness, chemical and solvent resistance, has improved while flexibility and impact resistance decreased. © 2015, Copyright © Taylor & Francis Group, LLC.

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