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1958•Journal of the Textile Institute TransactionsRequires access

49—THE DEGREE OF POLYMERIZATION AND ITS DISTRIBUTION IN CELLULOSE RAYONS: Part VII—THE INTRINSIC VISCOSITY AND DEGREE OF POLYMERIZATION OF SECONDARY CELLULOSE ACETATE FRACTIONS

R. J. E. Cumberbirch, W. G. Harland

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Abstract

The fractionation of two secondary cellulose acetates, in three stages and on a scale large enough to permit model filaments to be spun from the fractions, is described. The degrees of polymerization of all the fractions were derived from osmotic measurements in ethyl lactate, and of some of the fractions from measurements in acetone, in 80/20 v/v acetone/water, in pyridine at 25° and 60°C, and in 70/30 methylene chloride/ethanol. The relations between degree of polymerization and intrinsic viscosity measured in acetone and in 80/20 acetone/water have been established for the range 100—1200 polymer units and 0·8—6·0 decilitres per gramme.

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The fractionation of two secondary cellulose acetates, in three stages and on a scale large enough to permit model filaments to be spun from the fractions, is described. The degrees of polymerization of all the fractions were derived from osmotic measurements in ethyl lactate, and of some of the fractions from measurements in acetone, in 80/20 v/v acetone/water, in pyridine at 25° and 60°C, and in 70/30 methylene chloride/ethanol. The relations between degree of polymerization and intrinsic viscosity measured in acetone and in 80/20 acetone/water have been established for the range 100—1200 polymer units and 0·8—6·0 decilitres per gramme.

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Available abstract

The fractionation of two secondary cellulose acetates, in three stages and on a scale large enough to permit model filaments to be spun from the fractions, is described. The degrees of polymerization of all the fractions were derived from osmotic measurements in ethyl lactate, and of some of the fractions from measurements in acetone, in 80/20 v/v acetone/water, in pyridine at 25° and 60°C, and in 70/30 methylene chloride/ethanol. The relations between degree of polymerization and intrinsic viscosity measured in acetone and in 80/20 acetone/water have been established for the range 100—1200 polymer units and 0·8—6·0 decilitres per gramme.

Key concepts: Degree of polymerization, Acetone, Polymerization, Cellulose acetate, Chemistry, Polymer chemistry, Intrinsic viscosity, Fractionation

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49—THE DEGREE OF POLYMERIZATION AND ITS DISTRIBUTION IN CELLULOSE RAYONS: Part VII—THE INTRINSIC VISCOSITY AND DEGREE OF POLYMERIZATION OF SECONDARY CELLULOSE ACETATE FRACTIONS — Research Paper | ScholarLens