酢酸セルロースのアセトン溶液の粘度と沈降

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タイトル別名
  • Viscosity and Sedimentation of Cellulose Acetate in Acetone
  • サクサン セルロース ノ アセトン ヨウエキ ノ ネンド ト チンコウ

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抄録

An attempt has been made to determine the draining effect and the unperturbed chain dimensions of cellulose acetate in acetone from its frictional properties. The solution viscosity and sedimentation coefficient s have been measured on the seven cellulose acetate fractions having the acethyl content 55.5% and the ratio of the weight- to number-average molecular weight ¯Mᵤ /¯Mₙ of 1.2~ 1.3. The partial free draining parameter X deduced by use of various methods is always less than 2. The unperturbed chain dimensions A has found to be 1.72 x 10⁻⁸ cm from the molecular weight dependence of the friction coefficient t (method 2J), where the draining effect and non-gaussian nature of the chain are reasonably taken into account. The A value thus obtained is in fairly good agreement with the most reliable value estimated in the previous paper.

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