Studies on the swelling of cotton fibers in alkali metal hydroxides. III. Structure‐property relations in fibers swollen at 0°C

Sreenivasan, S.; Iyer, P. Bhama; Patel, G. S.

doi:10.1002/app.1993.070480303

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…As a result, other agents and processes for the swelling of cotton fibers have been investigated. [1][2][3][4][5][6][7] Liquid ammonia-based mercerization is also used in the cotton industry. Like NaOH, an ammonium solution penetrates cotton's cellulose and reacts with the hydroxyl groups after breaking the hydrogen bonds.…”

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confidence: 99%

Investigation of the swelling of cotton fibers using aqueous glycine solutions

Remadevi

Gordon

Wang

et al. 2016

Textile Research Journal

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The treatment of cotton fibers using different chemicals, such as alkalis, acids and salt solutions, has captured the attention of researchers because of their important effects in dyeing, cross-linking and mercerizing processes. However, these agents are difficult in terms of process application and the requirement for major effluent treatment prior to discharge. In this paper, we report on the treatment of cotton in aqueous glycine solutions that were moderated, utilizing glycine’s amphoteric nature at different pH values, to enhance the morphological and moisture regain properties of cotton fiber. Treatment in an aqueous glycine solution buffered to pH 11 increased fiber ribbon width by 4.5%, cross-sectional area by 53% and moisture regain by 16%. Changes were dependent on the treatment solution pH value. This paper describes the glycine treatments and their influence on the cotton fiber cross-sectional morphology and regain properties. The results suggest that at suitable pH values aqueous glycine solutions have the ability to enhance cotton fibers in ways very similar to mercerizing.

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Investigation of the swelling of cotton fibers using aqueous glycine solutions

Remadevi

Gordon

Wang

et al. 2016

Textile Research Journal

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“…The WRV order of lyocell fibers treated with LiOH, NaOH, and KOH was found to be LiOH-treated ≈ NaOH-treated > KOH-treated . In the literature, the WRVs of alkali-treated cotton fibers were reported to decrease in the order LiOH > NaOH > KOH. , The difference in cellulose fiber type caused different impacts of alkali type on swelling degree (WRV).…”

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confidence: 99%

“…LiOH is not capable of penetrating the crystalline regions of highest order and mainly causes intercrystalline swelling. The crystallite lengths and crystallinity index of cotton were found to be reduced most by KOH treatment and least by LiOH when compared with NaOH treatment. , …”

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confidence: 93%

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What Does LiOH Treatment Offer for Lyocell Fibers? Investigation of Structural Changes

Öztürk

MacNaughtan

Mitchell

et al. 2011

Ind. Eng. Chem. Res.

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Lyocell fibers, regenerated cellulosic fibers spun from cellulose/N-methylmorpholine-N-oxide hydrate solution by wet spinning, were treated with LiOH aqueous solution at concentrations of up to 7.5 M to study the inter-and intrafibrillar changes. Wide-angle X-ray diffraction analyses were applied to identify the crystallinity index and crystallite size. Inverse size-exclusion chromatography was applied to study the pore structure of the swollen fibers. The mean pore diameter was found to increase after the LiOH treatment. The carboxyl content, measured by methylene blue sorption, decreased slightly. The water retention value, depth of color measured after dyeing with CI Direct Red 81, and weight loss of fibers changed gradually after LiOH treatment at concentrations up to ca. 5 M. The treated fibers became brittle as a result of both inter-and intrafibrillar swelling and the deep penetration ability of LiOH treatments above 5 M.

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Studies on swelling of cotton fibers in alkali metal hydroxides. IV. Influence of initial fiber properties and variations in fine structure on tensile behavior

Sreenivasan

Iyer

Patel

1995

J of Applied Polymer Sci

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SYNOPSISNineteen varieties of cotton, covering a wide range of fiber properties like maturity, fineness, and strength uniformity ratio were swollen in 5N K O H and NaOH a t room temperature (30 f 1°C). Tensile and fine structural properties of the resultant samples were measured and their relationship with initial fiber properties was examined. A comparative evaluation of fiber properties of K O H swollen fibers with those swollen in NaOH revealed that, irrespective of variety, fibers swollen in the former reagent retain higher tenacity. It was further noted that fine structural parameters like crystallite orientation and amorphous content which influence tensile properties become modified differently while swelling in the two reagents. While changes in crystallite orientation were found t o be less drastic during K O H swelling, unlike in NaOH, the reverse was found to be true with crystalline content. These changes in fine structure could more or less explain the variation in tensile properties of fibers swollen in these two reagents.

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Studies on the swelling of cotton fibers in alkali metal hydroxides. III. Structure‐property relations in fibers swollen at 0°C

Cited by 7 publications

References 14 publications

Investigation of the swelling of cotton fibers using aqueous glycine solutions

Investigation of the swelling of cotton fibers using aqueous glycine solutions

What Does LiOH Treatment Offer for Lyocell Fibers? Investigation of Structural Changes

Studies on swelling of cotton fibers in alkali metal hydroxides. IV. Influence of initial fiber properties and variations in fine structure on tensile behavior

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