Measurement of the Ultraviolet Optical Characteristics of Cotton

Brysson, Ralph J.; Trask, Brenda J.

doi:10.1177/004051756603600812

Cited by 3 publications

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“…The effect of noncellulosic material is generally agreed to be that of accelerating or photosensitizing the decomposition of cellulose by visible and near-ultraviolet radiation. This point has been well illustrated in a recent publication by Brysson and Trask [4] describing the optical characteristics of cotton in the range 280 to ' 400 mp. They found that the absorption decreases ' ( transmittance and reflectance increase) in changing .…”

Section: Methodsmentioning

confidence: 60%

“…The work of Brysson and Trask [4] includes experiments in which the optical characteristics of scoured and bleached cotton duck and of ground scoured and bleached cotton poplin were measured. Comparison of these data shows that the , poplin after grinding has a higher reflectance (lower absorption) than the woven duck.8 3 Segal et ol.…”

Section: Mechanism Of Protectionmentioning

confidence: 99%

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The Effect of Solvents on Some Properties of Cotton Cellulose 1

Wiles

Cooney

Gingras

1967

Textile Research Journal

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Samples of cotton duck were immersed in pyridine, aqueous methylamine solutions, and a variety of other solvents. Pyridine and methylamine caused swelling of the cellulose fibers and an increase in the moisture content of the fabric. Pyridine also increased the fabric breaking strength. This is explained in terms of enhanced plasticization by pyridine and water molecules which are hydrogen-bonded to cellulose. Treatment by pyridine or aqueous methylamine reduced the rate of photochemical degradation of fabric samples exposed in a Weather-Ometer. An explanation for this is based on the changes these solvents cause in the fiber structure, e.g., less dense packing of cellulose chains in the swollen fibers. It is suggested that swollen fibers absorb less of the incident light from a carbon-arc and dissipate more of the absorbed energy without chain scission.

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Section: Methodsmentioning

confidence: 60%

Section: Mechanism Of Protectionmentioning

confidence: 99%

The Effect of Solvents on Some Properties of Cotton Cellulose 1

Wiles

Cooney

Gingras

1967

Textile Research Journal

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“…Other impurities are not soluble in polar solvents and are not removed by scouring and bleaching. These presumably absorb at even higher wavelengths [9]. It is reasonable to assume, therefore, that absorption by noncellulosic cellulose by light in the 3400-4000 A range.…”

Section: Resultsmentioning

confidence: 99%

Effect of Noncellulosic Material on the Actinic Degradation of Cotton Fabric

Wiles

Cooney

Gingras

1968

Textile Research Journal

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Cotton duck samples were treated with derivatives of salicylaldehyde or with copper complexes of these derivatives, and were exposed in a carbon-arc Weather-Ometer. The effectiveness of the treatments in reducing the rate of photo-induced depolymerization of cotton cellulose has been related to (a) the volatility of the treating compounds and complexes, (b) the ability of the compounds to form intramolecular, six-member chelate rings; and (c) the absorption of the treating materials in the spectral region of most intense emmission from the carbon-arc light source. Comparison with oxine and copper oxinate has been made. '

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The UV spectra of cellulose and some model compounds

Bos

1972

J of Applied Polymer Sci

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SynopsisComparison of the reflectance spectrum of cellulose with that of myoinositol, cycloheptaamylose, and other model compounds indicates that the acetal linkage does not contribute significantly to the absorption peak at 260 nm. The spectra of photolyzed and photo-oxidized cellulose suggest that ketonic carbonyl groups are a more likely cause of t h s peak. Photolysis of cellulose and amylose under vacuum with 253.7 nm light increases the concentration of ketonic carbonyls and thus promotes yellowing. Photo-oxidation with 253.7-nm light bleaches both carbohydrates owing to the formation of carboxyl groups. Other investigators had previously reported that this last reaction yellows cellulose, but it appears that this was an effect caused by the 184.9-nm component in the light of the lamp used. Comparison of the spectra of thermally and photolytically yellowed cellulose indicates that the end products of the two degradations are quite different.

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Measurement of the Ultraviolet Optical Characteristics of Cotton

Cited by 3 publications

References 0 publications

The Effect of Solvents on Some Properties of Cotton Cellulose 1

The Effect of Solvents on Some Properties of Cotton Cellulose 1

Effect of Noncellulosic Material on the Actinic Degradation of Cotton Fabric

The UV spectra of cellulose and some model compounds

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