Synthesis and Characterization of Polyurethane Anionomer.

An isocyanate-terminated prepolymer prepared from 1, 1'-methylenebis (4-isocyanatobenzene)(MDI) and α-hydro-ω-hydroxypoly (oxytetramethylene) (PTMG) was chain extended with 2, 2bis (hydroxymethyl) propionic acid (DMPA). The resulting carboxy group-containing polyurethane was converted into a polyurethane anionomer by treatment with potassium acetate, magnesium acetate, or N, N'-dimethylpiperazine. The chemical structure of the polyurethane anionomer was characterized with respect to its mechanical, dynamic viscoelastic and thermal properties.