Never-Dried Cotton Fibers

Eckberg, Richard P.; Ingram, Peter; Williams, J. L.

doi:10.1177/004051757604600903

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…Strength and elongation at break of untreated ND and dried cotton were measured on single fibers (Table IV). Elongations of ND fibers broken under water were considerably lower than values given in the literature (11% to 13% here vs. 27.1% (Eckberg et al, 1976)), probably because of stresses unavoidably applied to our fibers as they were separated from the mass of fibers stored in jars of water. Such stresses can cause irreversible changes in fiber physical properties.…”

Section: Resultscontrasting

confidence: 71%

“…Never-dried cotton has been reacted with various reagents in order to introduce substituents on the cellulose chains. Such substituents would retard the structural collapse that occurs during the initial drying, preserving some of the properties of never-dried cotton (Eckberg et al, 1976; Fahmy and Mobarak, 1972;Kulshreshtha et al, 1977; Nelson et al, 1980).…”

Section: Introductionmentioning

confidence: 99%

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Closed-Boll Cotton. 3. Effect of Treatment with Propylene Oxide on Sorptive and Mechanical Properties of Fibers and Yarns

Rousselle¹,

Nelson²,

Ramey³

et al. 1980

Ind. Eng. Chem. Prod. Res. Dev.

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Cotton bolls were harvested at three stages before boll opening (closed bolls), and after opening on the plant (field-opened bolls). Half of the closed bolls were maintained in the never-dried state; the remaining closed bolls were allowed to air-dry and open off the plant. Never-dried closed-boll fibers, rewet dried closed-boll fibers, and rewet field-opened fibers were treated with NaOH solution and propylene oxide and spun into yams. Water retention, moisture vapor sorption, and dye uptake were greatly increased (relative to untreated dried cotton) by the treatment, but not to the level found for untreated never-dried cotton. Fiber-bundle elongation and tenacity and yarn elongation were increased by the treatment; yam tenacity was slightly decreased. Treatment of yarns produced similar changes in sorptive and mechanical properties, but to a lesser degree than treatment of fibers.

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Section: Resultscontrasting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Closed-Boll Cotton. 3. Effect of Treatment with Propylene Oxide on Sorptive and Mechanical Properties of Fibers and Yarns

Rousselle¹,

Nelson²,

Ramey³

et al. 1980

Ind. Eng. Chem. Prod. Res. Dev.

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Induced crystallization of cellulose in never‐dried cotton fibers

Iyer¹,

Sreenivasan²,

Chidambareswaran³

et al. 1991

J of Applied Polymer Sci

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SYNOPSISIn the present investigation, we have made a systematic study of the induced crystallization in never-dried cotton fiber, by allowing it to desiccate under different conditions of humidity and temperature. The resulting structural changes have been followed using x-ray diffraction and infrared absorption techniques. A slow rate of drying coupled with a high temperature was more conducive for maximum crystallization. Analysis of the effect of temperature on the induced crystallization showed possible existence of a thermal transition in cellulose around 3OOC. The induced crystallization brought about by slow drying as well as those produced using intercrystalline swelling agents, have been shown to be resulting from a proper channelization of the interfibrillar mobility existing in the never-dried fibers.* Part of the results reported here were presented as poster in Session 9 "Crystallisation Phenomena"

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Effects of Dehydration on the Crystalline Structure and Strength of Developing Cotton Fibers

Hsieh

2001

Textile Research Journal

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Cotton fibers develop a significant crystalline structure during the first week of secondary wall synthesis. Marked increases in the degree of crystallinity, crystallite dimensions, and breaking forces occur between 20 and 30 days post-anthesis (dpa). As the fiber cells mature and dehydrate, the cylindrical tubes collapse into convoluted ribbons. The dried fibers have lower breaking strength and higher breaking elongation. Wide-angle x-ray diffraction and solid-state NMR results show lowered average crystallite dimensions with little change in the overall crystallinity upon dehydration. In developing cotton fibers, dehydration appears to cause decrystallization, distortion of crystal surfaces, and increased disorder in the intercrystal and interfibril regions, driven by removal of water during cell collapse and by the formation of new intermolecular secondary bonding. This, in turn, builds up stress at the molecular level, lowering strength and increasing crimp and elongation in the dried cottons.

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Never-Dried Cotton Fibers

Cited by 6 publications

References 18 publications

Closed-Boll Cotton. 3. Effect of Treatment with Propylene Oxide on Sorptive and Mechanical Properties of Fibers and Yarns

Closed-Boll Cotton. 3. Effect of Treatment with Propylene Oxide on Sorptive and Mechanical Properties of Fibers and Yarns

Induced crystallization of cellulose in never‐dried cotton fibers

Effects of Dehydration on the Crystalline Structure and Strength of Developing Cotton Fibers

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