Shrinkage of Cotton Fibers in Sodium Hydroxide Solutions and Resulting Elastic Properties

Goldthwait, Charles F.

doi:10.1177/004051756503501104

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…The observed reduction in length is attributed, in part, to the same shrinkage phenomenon that accompanies the cross-sectional swelling of fibers in slack mercerization of cotton, and which has also been observed in these glycine treatments. 22 Goldthwaite 32 reported shrinkages of between 15% and 19% for fibers treated in slack-form in strong sodium hydroxide. The values recorded in this investigation show glycine treated fiber shrinks less than 5% during treatment.…”

Section: Resultsmentioning

confidence: 99%

Tensile, physical, and microstructure properties of glycine treated cotton fibers

Remadevi

Gordon

Wang

et al. 2017

Textile Research Journal

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In this paper, the effect of aqueous glycine treatments at different pH on the tensile properties of cotton fibers is reported. The effects on linear density and X-ray diffraction crystallinity were also evaluated. Glycine treated fibers at alkaline pH (i.e. at pH 11) produced fibers with higher linear density than control (untreated) and glycine treatments at acidic pH. The same treatment also increased strain values in cotton fibers by as much as 36%. Interestingly, similar changes in strain were observed under acidic conditions, especially at pH4, although the changes were smaller. Specific stress values normalized by the linear density measurements were not significantly different from control samples. The results of this research demonstrated improved strain properties of cotton fibers after aqueous glycine treatment at suitable conditions.

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Section: Resultsmentioning

confidence: 99%

Tensile, physical, and microstructure properties of glycine treated cotton fibers

Remadevi

Gordon

Wang

et al. 2017

Textile Research Journal

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“…Slack mercerization is a practical method for achieving such properties as elasticity of cotton fibers. 5 and polynosic fiber were dyed with three reactive dyes. Polynosic fiber showed markedly different dye uptake depending on dye species.…”

Section: Introductionmentioning

confidence: 99%

Changes in dyeability and morphology of cotton fiber subjected to cellulase treatment

Mori

Haga

Takagishi

1997

J. Appl. Polym. Sci.

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Unprocessed and mercerized cotton fibers were treated with commercial crude cellulase. The changes in the dyeability and structural features of the fiber due to cellulase treatment were studied. The dyeability was examined in terms of uptake of three reactive dyes and the apparent affinity of Congo Red to cotton fiber. The dyeability of the unprocessed fiber was assumed to be influenced by some impurities present in it. This fiber probably resembled polynosic fiber in molecular aggregate at a certain stage of hydrolysis. Mercerized cotton showed a similar pattern in dyeability as weight loss increased, regardless of dye species. Enzyme more easily penetrated the mercerized fiber than the unprocessed fiber. Cellulase treatment influenced the X-ray crystalline reflection pattern for the mercerized fiber but nominally influenced that for unprocessed fiber. Scanning electron micrographs revealed that cellulase treatment caused swelling of the fibrils. They also revealed that the disordered regions between the fibrils in the secondary walls were removed at low weight loss for the unprocessed fiber. The mercerized fiber at high weight loss had large cracks oblique to the fiber axis and showed no individual fibrils in the secondary wall. The primary wall was removed in the initial stage of hydrolysis for both the unprocessed and mercerized fibers.

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“…1) consisting of two identical rings with an inner diameter of 100 mm and an outer diameter of 150 mm, which was laser-cut from 3 mm thick PMMA sheets and xed with eight M8 stainless steel bolts to apply even pressure across the outside of the nanopapers preventing shrinkage that commonly occurs during mercerisation. (Goldthwait 1965) This frame system, holding a nanopaper, was subsequently immersed into NaOH solutions of various concentrations for de ned time intervals (Table 1).…”

Section: Preparation Of Nanocellulose Papersmentioning

confidence: 99%

Retain strength, gain ductility: tough and transparent nanopapers by mercerisation

Mayer

Roller

Mautner

et al. 2023

Preprint

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Nanocellulose papers offer high tensile strength and modulus but suffer from drawbacks such as their brittle nature. Many attempts to alleviate these disadvantages were reported, with most of them being time and/or resource-intensive or requiring additional chemical or mechanical (pre)treatments, modification, or the use of additives. We show that mercerisation of cellulose nanopapers in strong alkaline media for 2 min to 24 h results in the (partial) transformation of native cellulose I into the more ductile cellulose II allomorph. The strain to failure of mercerised nanopapers tripled compared to the original nanopapers while retaining their tensile strength in excess of 100 MPa at the expense of a slight drop in modulus resulting in a significant increase in toughness (total work of fracture). An additional advantage of mercerisation is a reduction in porosity of the nanopapers and increased transparency.

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Shrinkage of Cotton Fibers in Sodium Hydroxide Solutions and Resulting Elastic Properties

Cited by 11 publications

References 13 publications

Tensile, physical, and microstructure properties of glycine treated cotton fibers

Tensile, physical, and microstructure properties of glycine treated cotton fibers

Changes in dyeability and morphology of cotton fiber subjected to cellulase treatment

Retain strength, gain ductility: tough and transparent nanopapers by mercerisation

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