Nanofibers based on cellulose acetates

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Resumo

The properties of cellulose diacetate solutions in acetone and acetone–water mixtures at ratios of 95:5, 93.5:7.5 and 90:10 were studied. The optimal concentrations of cellulose diacetate solution for the formation of nanofibers from a mixture of water and acetone with a water content of 7.5 wt% were found. Cellulose diacetate nanofibers were obtained in the form of nonwoven materials with an average nanofiber diameter of 350±10 nm. In order to obtain cellulose nanofibers with a thread diameter of 350–400 nm, cellulose diacetate nanofibers were hydrolyzed in a 0.1 M potassium hydroxide solution.

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Sobre autores

A. Sarymsakov

Institute of Polymer Chemistry and Physics of the Academy of Sciences of the Republic of Uzbekistan

Autor responsável pela correspondência
Email: sarimsakov1948@mail.ru
ORCID ID: 0000-0003-4562-7280
Uzbequistão, Tashkent, 100128

A. Shukurov

Institute of Polymer Chemistry and Physics of the Academy of Sciences of the Republic of Uzbekistan

Email: sarimsakov1948@mail.ru
ORCID ID: 0000-0002-2889-0258
Uzbequistão, Tashkent, 100128

N. Ashurov

Institute of Polymer Chemistry and Physics of the Academy of Sciences of the Republic of Uzbekistan

Email: sarimsakov1948@mail.ru
ORCID ID: 0000-0001-5246-434X
Uzbequistão, Tashkent, 100128

Kh. Yunusov

Institute of Polymer Chemistry and Physics of the Academy of Sciences of the Republic of Uzbekistan

Email: sarimsakov1948@mail.ru
ORCID ID: 0000-0002-4646-7859
Uzbequistão, Tashkent, 100128

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2. Fig. 1. Dependence of the viscosity of cellulose diacetate solutions on the concentration of the acetone-water solvent (%): 95:5 (1), 92.5:7.5 (2), 90:10 (3).

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3. Fig. 2. Dependence of the viscosity of cellulose diacetate solutions of different concentrations (1 – 5%, 2 – 10%, 3 – 15%) on the thermodynamic quality of the solvent.

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4. Fig. 3. Rheograms of cellulose diacetate (DAC) solutions of different concentrations in an acetone-water mixture at the following mass ratios: 1 – DAC 5% (90:10), 2 – DAC 5% (92.5:7.5), 3 – DAC 5% (95:5), 4 – DAC 10% (90:10), 5 – DAC 10% (92.5:7.5), 6 – DAC 10% (95:5), 7 – DAC 15% (90:10), 8 – DAC 15% (92.5:7.5), 9 – DAC 15% (95:5).

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5. Fig. 4. SEM images of nanofibers obtained from 5% cellulose diacetate solutions at different magnifications: (a) ×1200, (b) ×3700.

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6. Fig. 5. SEM images of nanofibers obtained from 10% cellulose diacetate solutions at different magnifications: (a) ×500, (b) ×1000.

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7. Fig. 6. SEM micrographs of cellulose nanofibers obtained from 10% cellulose diacetate solutions containing 5 (a), 7.5 (b) and 10% (c) water in acetone after deacetylation with 0.1 M aqueous KOH solution.

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8. Fig. 7. IR spectra of cellulose diacetate nanofibers (1) and cellulose nanofibers (2).

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9. Fig. 8. X-ray diffraction patterns of cellulose nanofibers (1) and cellulose diacetate (2).

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