Abstract
The thermodynamic interaction between cellulose acetate (CA) and solvent was studied by 1H nuclear magnetic resonance (NMR) and infrared spectroscopy. Three CA whole polymers (degrees of substitution, DS=0.49, 2.46, and 2.92) and their fractions were used. Chemical shifts of the methyl proton in the O-acetyl and of the hydroxyl proton in the CA molecule in various solvents were measured as functions of dielectric constant ε, electronegativity Δν of the solvent, the degree of substitution DS and the weight-average molecular weight Mw of CA. These chemical shifts were constant in the range Mw≳1×105. The chemical shifts of methyl proton of O-acetyl and hydroxyl groups are a unique function of ε and Δν. The CA molecule has a stronger interaction with high polar solvents, and there are intimate correlations between the short-range interaction parameter A and these chemical shifts. The solvent dependence of A, observed for cellulose acetates, can be interpreted by the O-acetyl··solvent and hydroxyl··solvent interactions.
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Kamide, K., Okajima, K. & Saito, M. Nuclear Magnetic Resonance Study of Thermodynamic Interaction between Cellulose Acetate and Solvent. Polym J 13, 115–125 (1981). https://doi.org/10.1295/polymj.13.115
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DOI: https://doi.org/10.1295/polymj.13.115
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