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EFFECTS OF SUPERCRITICAL CARBON DIOXIDE ON MORPHOLOGY OF APOCYNUM VENETUM FIBERS

ABSTRACT
This paper investigated the structures and compositions of apocynum venetum fibers treated with pectinase and mixture of sodium hydroxide and hydrogen peroxide in supercritical carbon dioxide fluid. The apocynum venetum fibers were analyzed by Fourier transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Fourier transform infrared analysis indicated that pectinase could remove the pectin and hemicellulose and the mixture of sodium hydroxide and hydrogen peroxide could extract the lignin in supercritical carbon dioxide. Meanwhile, the results of X-ray diffraction showed that cellulose crystallinity index and crystallite sizes of treated fibers increased in comparison with that of untreated fibers. The studies of scanning electron microscopy also revealed a complete removal of non-cellulosic gummy material from surface of treated apocynum venetum fibers. Small gummy on the surface of apocynum venetum fibers would be removed by supercritical carbon dioxide, which can be verified by bubble dynamics.
KEYWORDS
PAPER SUBMITTED: 2014-12-29
PAPER REVISED: 2015-05-05
PAPER ACCEPTED: 2015-05-29
PUBLISHED ONLINE: 2015-10-25
DOI REFERENCE: https://doi.org/10.2298/TSCI1504279G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE 4, PAGES [1279 - 1282]
REFERENCES
  1. Li, Z. L., et al., Effect of Peroxide and Softness Modification on Properties of Ramie Fiber, Fibers and Polymers, 15 (2014), 10, pp. 2105-2111
  2. Yu, H. Q., et al., Influence of Various Retting Methods on Properties of Kenaf Fiber, Journal of the Textile Institute, 101 (2010), 5, pp. 452-456
  3. Seabra, I. J., et al., Statistical Mixture Design Investigation of CO2-Ethanol-H2O Pressurized Solvent Extractions from Tara Seed Coat, Journal of Supercritical Fluids, 64 (2012), 4, pp. 9-18
  4. Heidaryan, E., et al., Viscosity of Pure Carbon Dioxide at Supercritical Region: Measurement and Correlation Approach, Journal of Supercritical Fluids, 56 (2011), 2, pp. 144-151
  5. Andreeva, Q. A, et al., IR Spectroscopic Study of Prepurified Flax, Russian Journal of Applied Chemistry, 75 (2002), 9, pp. 1513-1516
  6. Sinha, E., et al., Influence of Fibre-Surface Treatrment on Structural, Thermal and Mechanical Properties of Jute, Journal of Materials Science, 43 (2008), 8, pp. 2590-2601
  7. He, J.-H., Effect on Temperature on Surface Tension of a Bubble and Hierarchical Ruptured Bubbles for Nanofiber Fabrication, Thermal Science, 16 (2012), 1, pp. 327-330
  8. Yang, R. R., et al., Bubble-Electrospinning for Fabricating Nanofibers, Polymer, 50 (2009), 24, pp. 5846-5850

© 2020 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence