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The cholesteric pitch P of semiflexible helical polymer solutions was formulated using a threaded equivalent freely jointed chain model. The theory was favorably compared with experimental results of P for cholesteric solutions of the three helical polymers schizophyllan (a triple-helical polysaccharide), poly(γ-benzyl l -glutamate), and poly(( R )-2,6-dimethylheptyl isocyanate), and two chiral interaction parameters characterizing the chiral hard-core repulsion and the soft dispersion force were determined from this comparison. However, the same theory failed to describe the polymer concentration dependence of P for cholesteric solutions of (acetoxypropyl)cellulose in a very concentrated region.
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Sato et al. (1998) studied this question.
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