MIXTURE DESIGN APPROACH TO PEG-PPG-PTMG TERNARY POLYOL-BASED WATERBORNE POLYURETHANES

A systematic modeling analysis for polyaddition of isophorone diisocya nate to poly(oxyethylene) glycol, poly(oxypropylene) glycol, and poly( oxytetramethylene) glycol (PEG-PPG-PTMG) ternary polyol-based waterbor ne polyurethane (PU) synthesized by a modified acetone process was per formed. Using a mixture of experimental designs, empirical models are fitted and plotted as contour diagrams which facilitate revealing the synergistic/antagonistic effects between the mixed polyols. The result s indicate that each component demonstrates different performances in either binary (PEG-PPG, PPG-PTMG, and PEG-PTMG) or ternary (PEG-PPG-PT MG) systems with the PTMG-based waterborne polyurethane, which is the best material for film tensile strength and ultimate elongation. Parti cle size analysis shows that finer particles are obtained in the dispe rsion of PEG-containing waterborne polyurethane while the dispersion b ehavior of PEG-rich waterborne PU exhibits the water-soluble polymer p lastisol; in contrast, larger particles are achieved in the dispersion of PTMG (or PPG)-rich waterborne PUs, which demonstrates the polymer latex behavior.