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Abstract
In this study, a series of 1-package anionic polyurethane dispersions (PUDs) based on isophorone diisocyanate (IPDI), polyethylene glycol (PEG), and castor oil (CO) were prepared. The fourier transform infrared spectroscopy (FTIR) was conducted to ensure that the reaction was completed. The thermal analyses like dynamic mechanical thermal analysis (DMTA) indicated that the rise in NCO/OH ratio increased the glass transition temperature. Physico-mechanical properties such as tensile strength and hardness increased by increasing the NCO/OH ratio, but elongation at break decreased. Besides, the dispersion at pH = 8.4, pH = 9.1, and pH = 9.8 had the average particle size of 961, 681, and 494 nm and zeta potential of -0.549, -2.75, and -3.72 respectively. This work provides a new way to synthesize environmentally-friendly transparent 1-package PUDs with essential properties like higher tensile strength and unlimited pot life for various applications such as coating, leather, wood products, and so on in comparison to 2-package ones.
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