Polyurethane (PU) anionomer dispersions were formulated from polytetramethylene ether glycol (PTMG), polypropylene glycol (PPG), dimethylol propionic acid (DMPA), and isophorone diisocyanate following a prepolymer mixing process. Effect of ionic content, mixing ratio of polyols (PPG/PTMG), and polyol molecular weight on the emulsion characteristics and the dynamic mechanical and tensile properties of the emulsion-cast films were studied. Particle size decreased with increasing DMPA, PPG content, and the molecular weight of PTMG. The glass transition temperature of the soft segment was almost independent of the DMPA content and the molecular weight of PTMG, but increased with PPG content in the mixed polyol system, due probably to the increased phase mixing between soft and hard segments.
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Kim et al. (1994) studied this question.
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