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Wool yarns were coated with conducting polypyrrole by chemical synthesis methods. Polymerization of pyrrole was carried out
in the presence of wool yarn at various concentrations of the monomer and dopant anion. The changes in tensile, moisture absorption,
and electrical properties of the yarn upon coating with conductive polypyrrole are presented. Coating the wool yarns with
conductive polypyrrole resulted in higher tenacity, higher breaking strain, and lower initial modulus. The changes in tensile
properties are attributed to the changes in surface morphology due to the coating and reinforcing effect of conductive polypyrrole.
The thickness of the coating increased with the concentration of p-toluene sulfonic acid, which in turn caused a reduction
in the moisture regain of the wool yarn. Reducing the synthesis temperature and replacing p-toluenesulfonic acid by anthraquinone
sulfonic acid resulted in a large reduction in the resistance of the yarn. 相似文献
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Xin?Liu Christopher?J.?Hurren Lijing?Wang Xungai?WangEmail author 《Fibers and Polymers》2004,5(2):128-133
This paper reports the effects of bleaching of alpaca tops and dyeing of bleached alpaca tops/yarns on the quality of tops
and yarns. A dark brown alpaca top was bleached with hydrogen peroxide. Two bleaching methods were tried for effectiveness
of color removal. A portion of each bleached top was dyed after bleaching. Color parameters were examined for unbleached,
bleached and bleached/dyed tops, these tops were then converted into yarns of different twist levels and counts using a worsted
spinning system. Some of the bleached yarn from each bleaching method was dyed in a package dye vat to compare the difference
of top dyeing versus yarn package dyeing on yarn quality. Fiber diameter, yarn strength, yarn evenness, yarn hairiness and
fiber degradation were tested to examine the effects of bleaching and dyeing on these properties at top and yarn stages. A
processing route for bleaching and dyeing alpaca fiber was recommended. 相似文献
3.
Dark brown Alpaca fiber was reduced in shade via selective bleaching with peroxide. Two selective oxidative bleaching methods
were tested on alpaca top to assess their effectiveness for color removal and fiber quality properties. Color change, bundle
strength, weight loss, fiber diameter, surface modification, dye-ability and dye wash fastness were assessed for both methods
and compared with the original brown top. Bleach method 1 (BL-I) showed little surface modification, 5.8 % weight loss and
2.4 % strength loss. D1925 yellowness index was reduced to 74.3 from 83.1 and provided a good base for the dyeing of medium
to deep shades. Bleach method 2 (BL-II) displayed considerable surface modification, 7.8 % weight loss and 18 % strength loss.
BL-II also resulted in a mean diameter reduction of 1.9 micron during bleaching. Yellow-ness was reduced to 64.5 from 83.1
and provided a very good base for the dyeing of medium to deep shades. BL-I showed better exhaustion of the pre-metallised
dye Lanaset Violet B than BL-II. Wash fastness for BL-II was 1 grey scale unit poorer than BL-I. BL-II showed far better color
clarity at pale depths however the wash fastness of the finished product was not good enough to maintain the depth or clarity
of the color. BL-I showed poorer clarity of color but exhibited better wash fastness results. 相似文献
4.
It is well known residual gum exists in degummed or retted hemp fibres. Gum removal results in improvement in fibre fineness
and the properties of the resultant hemp yarns. However, it is not known what correlation if any exists between the residual
gum content in retted hemp fibres and the fibre fineness, described in terms of fibre width in this paper. This study examined
the mean width and coefficient of variation (CV) of fibre width of seventeen chemically retted hemp samples with reference
to residual gum content. The mean and CV of fibre width were obtained from an Optical fibre diameter analyser (OFDA 100).
The linear regression analysis results show that the mean fibre width is directly proportional to the residual gum content.
A slightly weaker linear correlation also exists between the coefficient of variation of fibre width and the residual gum
content. The strong linear co-relation between the mean of fibre width and the residual gum content is a significant outcome,
since testing for fibre width using the OFDA is a much simpler and quicker process than testing the residual gum content.
Scanning Electron Microscopy (SEM) reinforces the OFDA findings. SEM micrographs show a flat ribbon like fibre cross-section
hence the term “fibre width” is used instead of fibre diameter. Spectral differences in the untreated dry decorticated skin
samples and chemically treated and subsequently carded samples indicate delignification. The peaks at 1370 cm−1, 1325 cm−1, 1733 cm−1, and 1600 cm−1 attributed to lignin in the untreated samples are missing from the spectra of the treated samples. The spectra of the treated
samples are more amine-dominated with some of the OH character lost. 相似文献
5.
Minoo Naebe Christopher Hurren Abderrahim Maazouz Khalid Lamnawar Xungai Wang 《Fibers and Polymers》2009,10(5):662-666
Aluminum particles (Al) were added to polypropylene (PP) in the presence of poly ethylene glycol (PEG) and polypropylene-graft-maleic anhydride to produce composites. The composites were then melt-spun into a mono filament and tested for tensile properties, diameter
evenness and morphology. Melt rheological properties of Al/PP composites were studied in linear viscoelastic response regions.
It was observed that level of dispersion of aluminum particles within a polypropylene composite fiber could be improved by
incorporating polyethylene glycol. The improvement of dispersion led to an improvement in the fibers mechanical properties
through a reduction of the coefficient of variation of fiber diameter. 相似文献
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