Protective bleaching of camel hair in a neutral ethanol–water system

Xia, Liangjun, Zhang, Chunhua, Xu, Wenfang, Zhu, Kundi, Wang, Aming, Tian, Ye, Wang, Yunli and Xu, Weilin 2018, Protective bleaching of camel hair in a neutral ethanol–water system, Polymers, vol. 10, no. 7, pp. 1-18, doi: 10.3390/polym10070730.

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Title Protective bleaching of camel hair in a neutral ethanol–water system
Author(s) Xia, Liangjun
Zhang, Chunhua
Xu, Wenfang
Zhu, Kundi
Wang, Aming
Tian, Ye
Wang, Yunli
Xu, Weilin
Journal name Polymers
Volume number 10
Issue number 7
Article ID 730
Start page 1
End page 18
Total pages 18
Publisher MDPI
Place of publication Basel, Switzerland
Publication date 2018-07
ISSN 2073-4360
Keyword(s) bleaching
camel hair
ethanol–water mixture
mechanical properties
natural fiber
whiteness
Summary As conventional bleaching under alkaline conditions is chemically damaging to protein fibers, a three-stage protective bleaching process in neutral ethanol⁻water mixtures was proposed for camel hair using mordanting with ferrous salts, oxidative bleaching with hydrogen peroxide, and reductive bleaching with sodium hydrosulfite. The aim of this work was to improve the whiteness degree of camel hair without substantial tenacity loss. In addition, the roles of ethanol during the bleaching treatment were also examined by characterizing the fibers using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction. The whiteness degree and mechanical properties of camel hair bleached in the neutral ethanol⁻water system were significantly superior to those of fibers bleached by a conventional method. SEM images showed no visible cracks on the scales of fibers bleached in the ethanol⁻water system, whereas large grooves were observed on fibers bleached in aqueous solution. TEM images confirmed the positive influence of ethanol on the mordanting process, and FTIR spectra suggested that ethanol reduced the breakage of hydrogen bonds in the fibers during the oxidative bleaching process. These findings indicate the potential of this protective bleaching method for application to a broad range of other natural protein fibers.
Language eng
DOI 10.3390/polym10070730
Field of Research 091012 Textile Technology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2018, the authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30120776

Document type: Journal Article
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