Rheology of concentrated solutions of poly(γ‐benzyl‐glutamate)

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Abstract
Steady shear viscosity, dynamic viscosity, dynamic modulus, and normal force were measured via rotational rheometry for concentrated solutions of racemic mixtures of poly(benzyl‐L‐glutamate) and poly(benzyl‐D‐glutamate) in m‐cresol. A transition from the isotropic state to liquid–crystalline order with increase in concentration was indicated by optical anisotropy and maxima in all four material functions. This occurred at a critical concentration higher than the Flory prediction. Over a well‐defined range of concentrations and shear stresses, some of the liquid–crystalline solutions exhibited negative first normal‐stress differences that were not due to inertial effects.
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