ABSTRACT
The dispersion cohesion parameter can be calculated by the homomorph method or from the refractive index. A. Beerbower and J. R. Jensen have reviewed the correlation between dispersion properties and the “softness” in the Pearson “hard or soft” acid-base concept. Many authors have pointed out that electron donating and accepting properties can be discussed in terms of acid-base cohesion parameters. The dimerization of several carboxylic acids has been assessed in terms of cohesion parameters. Hansen’s total cohesion parameter should equal the Hildebrand parameter, although the two quantities may differ for materials with specific interactions when they are determined by different methods. Dipole induction effects arise from dipole-induced dipole or Debye interactions occurring between molecules with permanent dipole moments and any other neighboring molecules, whether polar or not, and result in an induced nonuniform charge distribution.
