SOLUBILITY PARAMETER COMPONENTS OF SOME POLYURETHANES

The components of the solubility parameter of some polyurethanes have been determined. The determination is based on the application of three mixtures of solvents. For each mixture, the point of maximum interaction between the mixture and the polyurethane was obtained from the maximum value of the intrinsic viscosity. The calculation of the solubility parameter components is based on the application of the three points of maximum interaction for each examined polymer. The following components of solubility parameters, and total parameters have been obtained: for polyurethane obtained from poly(ethylene oxide) and 1,6-hexamethylene diisocyanate: delta(d) = 17.6 +/- 0.1, delta(p) = 3.5 +/- 0.2, delta(h) = 9.0 +/- 0-1, delta(o) = 20.1 +/- 0.2, for polyurethane from poly(propylene oxide) and 1,6-hexamethylene diisocyanate: delta(d) = 16.8 +/- 0.8, delta(p) = 4.4 +/- 0.2, delta(h) = 6.8 +/- 0.3, delta(o) = 18.6 +/- 0.9, for polyurethane from poly(ethylene adipate) and 1,6-hexamethylene diisocyanate: delta(d) = 17.2 +/- 1.7, delta(p) = 4.5 +/- 0.8, delta(h), = 9.3 +/- 0. 1, delta(o) = 20.1 +/- 1.7; all values are in (J/ml)1/2.