Interaction and Scale of Mixing in Cellulose Acetate/Poly(<Emphasis Type="Italic">N</Emphasis>-vinyl Pyrrolidone-co-vinyl Acetate) Blends |
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Authors: | Takahiro?Ohno Sachiko?Yoshizawa Yoshiharu?Miyashita Email author" target="_blank">Yoshiyuki?NishioEmail author |
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Institution: | (1) Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, 606-8502 Kyoto, Japan;(2) Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Tokyo, Koganei, Japan |
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Abstract: | Binary blends and pseudo complexes of cellulose acetate (CA) with vinyl polymers containing N-vinyl pyrrolidone (VP) units, poly(N-vinyl pyrrolidone) (PVP) and poly(N-vinyl pyrrolidone-co-vinyl acetate) P(VP-co-VAc)], were prepared, respectively, by casting from mixed polymer solutions
in N,N-dimethylformamide as good solvent and by spontaneous co-precipitation from solutions in tetrahydrofuran as comparatively
poor solvent. The scale of miscibility and intermolecular interaction were examined for the blends and complexes by solid-state
13C-NMR spectroscopy. It was revealed that the formation of complexes was due to a higher frequency of hydrogen-bonding interactions
between the residual hydroxyl groups of CA and the carbonyl groups of VP residues in the vinyl polymer component. From measurements
of CP/MAS spectra and proton spin-lattice relaxation times (T1ρH) in the NMR study, the existence of the hydrogen-bonding interaction was also confirmed for the miscible blends and the homogeneity
of the mixing was estimated to be substantially on a scale within a few nanometers. |
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Keywords: | Blend Cellulose acetate 13C NMR Complex Interaction Poly(N-vinyl pyrrolidone) Poly(N-vinyl pyrrolidone-co-vinyl acetate) |
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