Transformation of Cellulose II into Cellulose IV

Yurugi, Tadashi; Ogihara, Taeko

doi:10.1246/nikkashi1898.63.8_1457

Cited by 12 publications

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“…The largest decrease in the crystallinity took place during the alkali treatment without tension, and a slight decrease occurred with the preheat treatment. The tendency toward the change in the crystallinity with these treatments accorded with well known results [ 14,22]; however, we saw no relationship Table I. between the change in crystallinity and the change in crease recovery after the resin finishing.…”

Section: Resultssupporting

confidence: 89%

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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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Section: Resultssupporting

confidence: 89%

“…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.…”

mentioning

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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“…Amorphous cellulose has also been prepared by precipitation from cadmium ethylenediamine (cadoxen), 1 1 -12 cuprammonium hydroxide (cuam), 13 and phosphoric acid, 14 but these solvents degrade the cellulose and, with the alkaline solvents, alter its functional groups. Nonaqueous saponification of cellulose acetatel3,15, 16 and regeneration of nonaqueous cellulose xanthate solutions 13 also yield highly accessible celluloses. However, the conditions required for formation of these derivatives typically result in significant cellulose degradation.…”

Section: Introductionmentioning

confidence: 99%

Nondegradative Preparation of Amorphous Cellulose

Schroeder¹,

Gentile²,

Atalla³

1986

Journal of Wood Chemistry and Technology

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Amorphous (noncrystalline) cellulose was prepared by dissolving cotton hydrocellulose in the dimethylsulfoxide-paraformaldehyde solvent system and regenerating the cellulose by slow addition of the resultant methylol cellulose solution to stirred 0.2M sodium alkoxide in methanol:2-propanol (1:1 vol.). The regenerated celluloses, essentially devoid of residual methylol substituents (ca. 0.002 m.s.), had x-ray diffractograms, Raman spectra, and solid-state 13 C-n.m.r. spectra characteristic of amorphous cellulose. In addition, 98-100% of the cellulose hydroxyl groups were accessible to proton exchange with deuterium oxide. On small scale (< 2 g), the d.p. and end group composition of the cellulose were essentially unaltered by the regeneration process, but scaling the procedure up could result in a decrease in the cellulose d.p.

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Structural change of amorphous cellulose by water‐ and heat‐treatment

Hatakeyama¹,

Hatakeyama

1981

Makromol. Chem.

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Strips of amorphous cellulose film were conditioned under wet atmospheres of 80 and 100% relative humidity or heated at 393 K in vacuo for different time intervals. The structural change of these samples was investigated using differential scanning calorimetry (DSC), IR spectrometry, x-ray diffractometry (x-ray), and the density-gradient column method. In the initial stage of conditioning of cellulose samples at a wet atmosphere, it was found that the thermally determined relative volume fraction (a) of the amorphous part of cellulose stays constant while the diffusion coefficient (Dad), calculated from the rate of H + D exchange of OH groups observed in IR, decreases rapidly. This fact seems to show that the rearrangement of cellulose molecules does not occur as a whole but only partly in the vicinity of the OH groups which affect the process of H + D exchange. If large amounts of water are supplied, however, cellulose molecules rearrange freely and provide a crystalline structure, as observed clearly byx-ray. On the other hand, during the heat-treatment of amorphous cellulose, the decrease of a and Do, can be clearly observed by DSC and IR from the initial stage of treatment. Judging from the change of a and Do,, it was inferred that the hydrogen bond formation occurs step by step simultaneously with the rearrangement of cellulose molecules by heat-treatment.

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Transformation of Cellulose II into Cellulose IV

Cited by 12 publications

References 0 publications

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

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

Nondegradative Preparation of Amorphous Cellulose

Structural change of amorphous cellulose by water‐ and heat‐treatment

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