VISCOSITY STUDIES ON CELLULOSE ACETATE SOLUTIONS

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  • Saito Hideo
    Central Research Laboratory, Dainippon Celluloid Co. Ltd.
  • Uda Kazuo
    Central Research Laboratory, Dainippon Celluloid Co. Ltd.

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Other Title
  • 酢酸セルロース溶液の粘度的研究
  • (III) VISCOSITIES OF DILUTE SOLUTIONS OF CELLULOSE ACETATE BUTYRATE
  • 第3報 酢酸酪酸セルロース希薄溶液の粘度

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Description

Viscosities of dilute solutions of various cellulose acetate butyrate samples differing in acetyl and butyryl contents were determined using various solvents.<br>By plotting ηsp/c against C after Huggins′ equation, the linear relations were obtained and from these curves, [η], k′, initial slope k′[η]2 were calculated for each solution. Using water and n-hexane as the diluent, dilution ratio (DR) was also determined.<br>For all samples tested [η] are highest in acetic acid and lowest in the mixture of methylene chloride and ethanol, while methyl acetate and acetone give the intermediate values.<br>The relations between [η], k′, initial slope and DR are rather complicated.<br>In methyl acetate and acetone the values of k′ and initial slope are higher than those in acetic acid and the mixture of methylene chloride and ethanol.<br>DR with water showed the parallel tendency to the variation of [η]., but DR with n-hexane showed more complicated behavior.<br>The effects of the butyryl contents of the samples on these relations are qualititavely discussed.<br>Using the Staudinger's equation and the measured [η] in cuoxam the tentative Km constants for each samples differing in the acyl compositions in these solvents, were also determined.<br>These Km constants differ slightly with solvents and butyryl contents of the samples and lay between 5_??_7×10-4, taking Km for cellulose in cuoxam as 5×10-4.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 18 (2), 115-120,106, 1962

    The Society of Fiber Science and Technology, Japan

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