Accessibility and Reaction Sites in Cotton

Jeffries, R.; Roberts, J. G.; Robinson, R. N.

doi:10.1177/004051756803800304

Cited by 40 publications

(7 citation statements)

References 20 publications

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“…Later, Jeffries proposed a new formula to calculate the accessibility of a cellulose sample, assuming that the maximum moisture regain (MR) for completely accessible cellulose at 65% relative humidity was 17%, described by Eq. 1 (Jeffries et al 1968). …”

Section: Accessibility Of Cellulose Allomorphsmentioning

confidence: 99%

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Studies concerning the accessibility of different allomorphic forms of cellulose

Ciolacu¹,

Pitol-Filho²,

Ciolacu

2011

Cellulose

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The supramolecular architecture and the morphological structure of cellulose play an important role in its accessibility. In order to evaluate the effect of the crystalline form of organization on the accessibility, we selected cellulosic materials with significant variations in the aforementioned characteristics. The assessment of the accessibility of cellulosic materials was performed experimentally through a water vapor sorption method. The kinetics and the thermodynamic parameters of water vapor sorption process were determined, and a correlation between the Flory-Huggins interaction parameters and the crystallinity index was derived. We concluded that the allomorph involving the most accessible crystal surfaces and amorphous regions was Cellulose II. The correlation of the accessibility values with those of the crystallinity index allowed us to evaluate the accessibility of the allomorphic forms of cellulose at different crystallinity indexes. The obtained experimental data allowed us to quantify the accessibility for crystal surfaces and amorphous regions of the different allomorphs in the order Cellulose II (38%) [ Cellulose I (24%) [ Cellulose III (10%).

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Section: Accessibility Of Cellulose Allomorphsmentioning

confidence: 99%

“…The accessibility of cellulose samples can be calculated according to equation (Jeffries et al 1968):…”

Section: Accessibility Of Cellulosementioning

confidence: 99%

Studies concerning the accessibility of different allomorphic forms of cellulose

Ciolacu¹,

Pitol-Filho²,

Ciolacu

2011

Cellulose

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“…Thus the following formula for calculating the accessibility of a cellulose sample was derived, assuming the maximum moisture regain for completely-accessible, < cellulose at 65% RH to be 17. (~Q [7]: ' All of the pretreated pulps had suf)stantialIN-higher moisture regains than did the unmercerized wood pulp. Liquid ammonia mercerization followed by evaporative removal of the ammonia resulted in a moisture regain of 12.2%, as compared to 12.6% with sodium hydroxide mercerization of Ravselect-J pulp, which is highly significant considering the much greater ease of the liquid ammonia treatment.…”

Section: Resultsmentioning

confidence: 97%

“…&dquo; Each value shcuvn represents the average of two specimens. Accessibility values were calculated from moisture-regain data assuming 17~ regain for completely accessible cellulose [7]. ~ ''Two similar batches were prepared from dry sheets by shredding in a blender, soaking in water at 5.5°C for several hours, and drying from acetone.…”

Section: Resultsmentioning

confidence: 99%

A Comparison of the Effects of Liquid Ammonia and Sodium Hydroxide Treatments on the Accessibility of Wood Pulp

Wadsworth

Cuculo

Hudson

1979

Textile Research Journal

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“…Jeffries and others [4,5] reported that the absorption of IR by OD near 2530 cm-' was due to &dquo;disordered&dquo; OH (OD), and the CH band near 2900 cm -' was independent of the deuteration. The ratio of intensity thus determined with the baseline technique from these bands (12530 em -1/12900 cm ' ) represents the accessibility of the sample fiber to water vapor ( Table V).…”

Section: Infrared Deuterationmentioning

confidence: 99%

Effect of Preheating and Alkali Treatment on Crease Recovery of Rayon Fabrics

Matsukawa

Sakurai

Nakamura

et al. 1983

Textile Research Journal

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The effect of various pretreatments on rayon fabrics before resin finishing was studied to clarify the mechanism of improvement in dry and wet crease recovery given by resin finishing. Preheating or alkali pretreatment enhanced dry crease recovery when using a reactant-type resin, but at the expense of improvement in wet crease recovery.To clarify the mechanism of improvement in dry and wet crease recovery by these pretreatments, infrared deuteration, x-ray diffraction, and lateral order distribution were carried out. Results are discussed taking into consideration the distribution of resin in the fibers and the water sensitive hydrogen bonds, which were effective only in dry crease recovery.Dry and wet crease recovery of textiles is an important factor, in resin finished wash and wear cellulosic fabrics. Reeves [ 17] related the improvement of dry and wet crease recovery of cotton fabrics to the interlamellar or inter-microfiliril crosslinks. On the other hand, Steele showed [18fthat intramolecular crosslinks were available only for wet crease recovery, and that intermolecular crosslinks as well as water sensitive links contributed to dry crease recovery.In previous papers (8, 9) we found that the factors effective in wet crease recovery were due to new covalent crosslinks and those in place of the water sensitive links, and that the factors effective in dry creases recovery were due to these two kinds of crosslinks and the rest of the water sensitive links.Recently, we found [7] that the cotton fabrics treated using the pad-cure process with a reactant type resin had higher wet and lower dry crease recovery than fabrics treated with the pad-dry-cure process. We explained these results by making the assumption that more crosslinks could be formed by the pad-cure process in intralamellar spaces at the swollen state. On the other hand, more crosslinks formed in the paddry-cure process in interlamellar spaces at the collapsed state as a result of the migration of the monomer from intra-, to interlamellar spaces, The drying process (before curing) necessarily moved the resin monomer from the lamellar out to the surface with the movement of the water. Many reports [ 10, 1 l, 16] referring to the effects on crease recovery of crosslinking of cotton fabrics at the swollen state showed that these fabrics had higher wet crease recovery by virtue of the covalent crosslinks in place of the water sensitive links, but few reports related the effect of preheating and alkali pretreatment before resin finishing of rayon fabrics.Preston el al. [ 15] Okajima et al. [ 12,20] investigated the change in fine structure of rayon fibers by wet heating and reported a decrease in swelling of the fibers in water.Yurugi et al. [21,22] reported the change of the crystalline structure from cellulose II to cellulose IV by wet heating rayon fibers, and Okajima tt al. [ 13] reported an increase in crystallinity and crystallite size by the same treatment.Recently Hindeleh [3] also showed the effect of a change in fiber structure such as crystall...

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Accessibility and Reaction Sites in Cotton

Cited by 40 publications

References 20 publications

Studies concerning the accessibility of different allomorphic forms of cellulose

Studies concerning the accessibility of different allomorphic forms of cellulose

A Comparison of the Effects of Liquid Ammonia and Sodium Hydroxide Treatments on the Accessibility of Wood Pulp

Effect of Preheating and Alkali Treatment on Crease Recovery of Rayon Fabrics

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