Abstract
The helical twisting power p −1 of binary cholesteric mixtures has been measured as a function of mole fraction x. Whenever the molecular structure of the components is different the function p −1(x) deviates considerably from linearity. In some cases unexpected helical inversions had been observed. The properties of the different mixtures can be understood by means of the molecular statistical theory of Goossens extended by consideration of the concentration dependence of the dispersion energy terms.
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