Abstract
An attempt was made to establish a method (method 2J) for estimating the unperturbed chain dimensions A [≡61/2(‹S2›0/M)1/2. ‹S20›01/2, unperturbed radius of gyration; M, molecular weight] of polymers from the frictional coefficient ξ in the case when the polymer chains are non-Gaussian and the draining effect cannot be ignored. The following equation was derived: where η0 is the viscosity of the solvent, B is a long-range interaction parameter, Kp and ap are parameters in the equation of the molecular weight dependence of the Flory parameter P as defined by and a2 are parameters in the relation: . By putting a2=ap=0, the above equation reduces to practically the same equation as that obtained by Cowie and Bywater (method 2I). These two methods (method 2J and 2I) were applied to literature data on cellulose, cellulose diacetate, cellulose tricarbanilate, ethyl-hydroxyethyl cellulose, and amylose triacetate. Method 2J meets with great success in elucidating the A value for these polymers. The A value as determined by method 2I is only some 50 % of the most reliable value.
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Kamide, K., Miyazaki, Y. Estimation of Unperturbed Chain Dimensions of Cellulose, Amlose, and Their Derivatives in Solution from Frictional Coefficient Data. Polym J 10, 539–546 (1978). https://doi.org/10.1295/polymj.10.539
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DOI: https://doi.org/10.1295/polymj.10.539