Abstract:

The effects of some nonionic surfactants on the kinetics of the soln.-mediated transition of stearic acid [57-11-4] of B and C polymorphs were studied. Some surfactants retard the transition of the thermodn. unstable stearic acid modification to the stable form in methanol, n-hexane and decane solns. The surfactants consisting of large hydrophilic moieties revealed a significant retardation effect. The effect also depends on the solvent; the lower the soly. of the surfactant in the solvents, the more the transition rate was decreased. The C→B transition was more affected than the B→C transition with a given surfactant. [on SciFinder(R)]