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Received July 11, 2013
Accepted August 31, 2013
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Synthesis and properties of aqueous polyurethane dispersions: Influence of molecular weight of polyethylene glycol
Institute of Chemistry, Government College University, Faisalabad 38030, Pakistan 1Department of Polymer Engineering and Technology, University of the Punjab, Lahore, Pakistan 2National Engineering and Scientific Commission (NESCOM), P. O. Box 2216, Islamabad, Pakistan
mohammadzuber@gmail.com
Korean Journal of Chemical Engineering, December 2013, 30(12), 2259-2263(5), 10.1007/s11814-013-0166-9
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Abstract
Aqueous polyurethane dispersions (PUDs) have recently emerged as important alternatives to their solventbased counterparts for various applications due to increasing health and environmental awareness. A series of aqueous polyurethane dispersions containing carboxylate anion as hydrophilic pendant groups were synthesized through step growth polymerization reaction using hexamethylene diisocyanate (HDI), 1,4-butanediol (1,4-BDO), dimethylol propionic_x000D_
acid (DMPA) and polyethylene glycol (PEG) of different molecular weight. Effect of PEG molecular weight was investigated on molecular structure, contact angle measurement, and physical and adhesive properties of PU emulsions. Fourier transform infrared spectroscopy (FT-IR) was used to check the completion of polymerization reaction. Contact angle measurement indicated that the hydrophilicity of polymer increases by increasing molecular weight of PEG with a corresponding decrease in contact angle. Results of T-peel test showed a decrease in peel strength by increasing molecular weight of PEG. Moreover, solid contents%, drying time and storage stability suggested fast drying properties and greater stability of aqueous PU dispersions.
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