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This paper reports the relation between the structure and the properties of polyurethane (PU) cationomers having various blend ratio of polyols and N+ concentration. NCO-terminated prepolymers were prepared from 2, 4-tolylene diisocyanate and polyols including poly (oxytetramethylene) glycol (PTMG), poly (oxypropylene) glycol (PPG) and two blended polyols which are PTMG/Poly (oxyethylene)glycol (PEG) (70/30mol%, abbreviated as 7T3E) and PPG/PEG (70/30 mol%, 7P3E). PU cationomers were obtained by chain-extension with the mixture of 1, 1, 1-trimethylolpropane, 1, 4-butanediol, and dimethyldiethanolammonium iodide. Thermal, dynamic mechanical, and tensile properties, and electric conductivity (complex impedance) of the resulting PU cationomers were studied. The compatibility between polyols and ions was found to decrease in the order of PEG>PPG>PTMG. The difference in compatibility caused variations in phase structure among PU cationomers. DSC and dynamic mechanical results suggested almost homogeneous (single phase) structure for 7P3E and microphase separation between PTMG and ionic phase for 10T (i.e. PTMG only). Tensile strength at break increased with N+ concentration due to the strong interaction among ions. PU cationomers containing PEG such as 7P3E and 7T3E, showed high electric conductivity.

The effects of polyol structures and N+ concentration on the multiphase structure and the properties of polyurethane cationomers.