Measurement of rotational diffusivity of rodlike molecules in amorphous polymer matrices by the dynamic kerr effect

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Abstract
Electrooptic (Kerr effect) relaxation experiments, designed to measure the rotational diffusivity of collagen (rodlike) molecules in aqueous poly(ethyleneoxide) (amorphous) semidilute solutions under various conditions have been performed. The experimental results have been compared with the predictions of a previously derived model giving the rotational diffusivity of dilute rods in semidilute amorphous polymer solutions as a function of rod length and amorphous polymer concentration. Excellent agreement is found between the predicted scaling Dr ∼ ϕL−7 (Dr = rod rotational diffusivity, pip = polymer weight fraction, and L = rod length) and the experiments.