| Abstract: | DSC-measurements were carried out with films prepared from dispersions of polyurethane ionomers, which were synthesized from two macrodiols, poly(tetramethylene oxide), poly(propylene oxide) or polyesters. Mixing of the two components was performed before the preparation of the NCO-terminated prepolymer, the chain extension or the dispersing step. Also two latices were mixed, which were synthesized using one macrodiol in each case. Films from latex mixtures always formed a two-phased soft segment. This confirms that the identity of the latex particles was retained during film formation. Mixing of two ionomers before the dispersing step always yielded a two-phased soft segment, independent of the mixibility of the two macrodiols or the respective NCO-terminated prepolymers. This indicates that each type of ionomer forms its own kind of latex particle. |
