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Six fractions have been obtained from a sample of cellulose nitrate (12.5%N) and molecular weights determined osmotically. Viscosity data are presented for the fractions in acetone and amyl methyl ketone, ethyl and amyl acetates, ethyl and butyl formates. Values of K and α in the expression [η] = KMa are given for each solvent. The chains seem to be more extended in the better of each pair of related solvents. Extension appears to be greater in acetates than in ketones of comparable solvent power. The limited flexibility of cellulose nitrate chains may decrease with increasing degree of nitration.
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Moore et al. (1956) studied this question.
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