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  • Engineering  (5)
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  • 1
    Online Resource
    Online Resource
    Characterization and control of oxidized cellulose in ramie fibers during oxidative degumming
    SAGE Publications ; 2017
    In:  Textile Research Journal Vol. 87, No. 15 ( 2017-09), p. 1828-1840
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 87, No. 15 ( 2017-09), p. 1828-1840
    Abstract: Oxidative degumming with hydrogen peroxide provides an efficient pathway and new alternative for natural fiber extraction. In this work, the oxidized cellulose introduced into ramie fibers during the oxidative degumming process was systematically characterized in terms of x-ray photoemission spectroscopy, nuclear magnetic resonance, Fourier transform infrared spectroscopy and scanning electron microscopy. The differences of chemical components, chemical shift, surface structure and surface morphology were analyzed and compared within oxidized cellulose fibers with different oxidation degrees. In addition, the relationship between oxidized cellulose contents and mechanical properties of degummed fibers were further discussed. The results show that the number of oxidized groups increases with increasing oxidation. In addition, the greater presence of oxidized cellulose contributes to a larger loss of tenacity, breaking elongation, flexibility and degree of polymerization in degummed fibers. This study could offer useful information in better understanding the reaction characteristics of oxidative degumming and better control of degummed fiber quality. The contents of oxidized cellulose in ramie fibers could be an effective indicating factor to demonstrate oxidative degumming efficiency and fiber properties.
    Type of Medium: Online Resource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/0040517516659380
    RVK:
    ZS 0001
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 2209596-2
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  • 2
    Online Resource
    Online Resource
    The cellulose protection agent used in the oxidation degumming of ramie
    SAGE Publications ; 2016
    In:  Textile Research Journal Vol. 86, No. 10 ( 2016-06), p. 1109-1118
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 86, No. 10 ( 2016-06), p. 1109-1118
    Abstract: In this paper, anthraquinone was used to improve the properties of ramie fiber in oxidation degumming. The chemical components, structure properties, tensile properties of degummed fiber and the character of oxidation degumming solution were tested and analyzed. With the optimal dosage of anthraquinone (2% (o.w.f.)), the content of hemicellulose, the yield of degumming process, polymerization degree and the work of rupture of the degummed fiber were improved by 17.3%, 7%, 2% and 41%, respectively. The oxidation reduction potential (ORP) value of the degumming solution was also tested, with the addition of anthraquinone, and the ORP value decreased by 250 mV, which is of benefit for the properties of fiber.
    Type of Medium: Online Resource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/0040517515606358
    RVK:
    ZS 0001
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 2209596-2
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  • 3
    Online Resource
    Online Resource
    Sustained-release alkali source used in the oxidation degumming of ramie
    SAGE Publications ; 2017
    In:  Textile Research Journal Vol. 87, No. 10 ( 2017-06), p. 1155-1164
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 87, No. 10 ( 2017-06), p. 1155-1164
    Abstract: Sodium hydroxide is commonly used as the main alkali source in the oxidation degumming of ramie in the current studies for natural fiber extraction. However, due to the strong alkalinity of sodium hydroxide, the oxidation reaction speed of hydrogen peroxide is difficult to control and thus results in great damage to the treated fibers. In this paper, magnesium hydroxide was selected as an effective sustained-release alkali source to improve the tensile properties of degummed fibers and reduce the chemical oxygen demand (COD) values of degumming wastewater. This novel reagent can adjust and buffer pH values in the degumming solution. The chemical components and structure properties of degummed fibers were characterized by Fourier transform infrared spectroscopy and X-ray diffraction, respectively, and the as-developed oxidation degumming solution performance was monitored by an oxidation–reduction potentiometer. The results showed that the optimal substitution rate of magnesium hydroxide was 20% during the oxidation process. Compared with the degummed fibers without magnesium hydroxide, the tenacity, work of rupture and degumming yield of treated fibers increased by 39.82%, 46.15% and 5%, respectively. Moreover, the COD values of wastewater decreased by 20% at the same time.
    Type of Medium: Online Resource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/0040517516648512
    RVK:
    ZS 0001
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 2209596-2
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  • 4
    Online Resource
    Online Resource
    Influence of single gummy component removal/retention on the physicochemical properties of fibrilia fiber and the reaction behavior of the other components in the degumming process
    SAGE Publications ; 2023
    In:  Textile Research Journal Vol. 93, No. 19-20 ( 2023-10), p. 4518-4534
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 93, No. 19-20 ( 2023-10), p. 4518-4534
    Abstract: Although many degumming methods for fibrilia fiber have been established, the reaction priority of the gums and the influence of single gummy component removal/retention on the fiber property and the reaction behavior of the other components remain unclear. This study analyzed the above issues by the observing the change of fiber in microbial-mechanical ‘enzyme peeling’ and gas phase ozone treatment. Results showed that pectin removal could increase the fiber density significantly (∼60.3%) but would not cause damage to the fiber tenacity. The 2.5–4.5% pectin in untreated fiber could strongly restrict the removal of lignin and hemicellulose. Lignin had less influence on fiber density than pectin. The detailed composition of hemicellulose had a significant effect on fiber tenacity: the retention of xylan and mannan caused damage and benefit, respectively, to fiber tenacity. After the removal of 90.0% pectin and 23.0% hemicellulose, a deep delignification rate ( 〉 70.0%) could be obtained. The delignification rate of 70.0–80.0% was beneficial for the density decreasing and tenacity increasing of the fiber, while a delignification rate over 80.0% would cause the collapse of the cellulose structure and thus damage the fiber property.
    Type of Medium: Online Resource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/00405175231174643
    RVK:
    ZS 0001
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2209596-2
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  • 5
    Online Resource
    Online Resource
    Analysis of oxidized cellulose introduced into ramie fiber by oxidation degumming
    SAGE Publications ; 2015
    In:  Textile Research Journal Vol. 85, No. 20 ( 2015-12), p. 2125-2135
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 85, No. 20 ( 2015-12), p. 2125-2135
    Abstract: Oxidized cellulose can be produced from the oxidation reaction of hydrogen peroxide in the degumming process of ramie fibers. In this work, the contents of aldehyde and carboxylate groups in ramie cellulose which occurred during the degumming process were quantitatively determined by the electric conductivity titration method. The morphological changes and chemical components of oxidized cellulose were characterized using SEM, XRD, and FT-IR. Additionally, the relationship between the contents of the oxidized groups and the mechanical properties of the degummed fibers were discussed and analyzed. Results showed that the presence of aldehyde and carboxylate groups in the cellulose contributed significantly to the loss of tenacity, breaking elongation, softness, and degree of polymerization of degummed fibers. When the aldehyde content varied from 20 to 35  µmol/g and the carboxylate content varied from 140 to 180 µmol/g, respectively, raw fibers could achieve desired and reasonable degumming results. This study could offer useful information in obtaining optimal operation parameters for ramie oxidation degumming and better control of fiber quality. The degree of oxidation and content of oxidized cellulose could be used as effective indicating factors to demonstrate oxidation degumming efficiency and fiber properties.
    Type of Medium: Online Resource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/0040517515581589
    RVK:
    ZS 0001
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2015
    detail.hit.zdb_id: 2209596-2
    Location Call Number Limitation Availability
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    Online Resource
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