Chemical Mechanism of Permanent Set

Farnworth, A. J.; Speakman, J. B.

doi:10.1038/161890a0

Cited by 20 publications

(6 citation statements)

References 2 publications

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“…(5) and (6). In the case of tbutylsulfenic infrared (IR) spectral data indicate it may undergo tautomerism as shown in E q .…”

Section: ( C H 3 ) 3 C S S C ( C H 3 )mentioning

confidence: 99%

“…Some sulfenyl derivatives find use in such areas as vulcanization acids [3a-c] radiation protecting group (Bunte salts or sulfenyl sulfites) [1], photosensitizers for polymerization [4], dye chem icals [5], wool chemicals [6], in polymer chemistry [7a,b] and in pesticide chemistry [8a,b], to mention only a few. For reviews on the chemistry of sulfenic acids see references [8c,d] and recent work by F. A .…”

Section: Introductionmentioning

confidence: 99%

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Sulfenic Acids and Sulfenic Acid Derivatives

1989

Organic Functional Group Preparations

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“…(5) and (6). In the case of tbutylsulfenic infrared (IR) spectral data indicate it may undergo tautomerism as shown in E q .…”

Section: ( C H 3 ) 3 C S S C ( C H 3 )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sulfenic Acids and Sulfenic Acid Derivatives

1989

Organic Functional Group Preparations

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“…(4) Dinitrophenylatio>1 [8].-Ten grams of wool was loosely wound around a propeller stirrer, which was then placed in a vessel containing 7 g. of sodium bicarbonate dissolved in 160 cc. of water.…”

Section: Chemical Modification Of Wool Yarn By Reaction With Monofuncmentioning

confidence: 99%

“…Equations (8) and (9) result when G' (T) is given by equation (3), and when it is assumed that both 1/ úJ and 1/a are much larger than Tmin.…”

mentioning

confidence: 99%

Preparation of Microbiologically Resistant Wool by Means of Chemical Modification: Part I

Zahn

Wilhelm

1953

Textile Research Journal

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“…at UNIV OF CINCINNATI on June 5, 2016 trj.sagepub.com Downloaded from tion theory which is essentially based on the ideas of Speakman and his collaborators [1,12,[23][24][25]. This theory assumes hydrolytic cleavage of disulfide bonds during the relaxation stage and stabilization of the extended configuration through the formation of new covalent cross links.…”

Section: Introductionmentioning

confidence: 99%

The Stabilization of Irreversibly Deformed Keratin Fibers

Weigmann

Dansizer

1971

Textile Research Journal

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576by-taking core samples. A three-fold hierachial experiment was carried out with the model equation where Yijk. is of the 1-th reading taken on the k-th subsample of the j-th core out of the i-th lot. The populations of the lots, cores, subsamples and readings were assumed to have variances of (1~2, (1c2, 0,2, and ff,2, respectively. From the analysis of variance, the following values were obtained , From this, it is possible to deduce that, by taking 20 cores from a lot and only taking one reading on each core, one would obtain a 95% confidence limit .of 1.1 microns.Acknowledgements. The authors gratefully acknowledge the assistance of Messrs.ABSTRACT The significance and relative contribution of the various factors that contribute to the stabilization of the extended state of the keratin fibers have been investigated. In this context, the stress relaxation of extended keratin fibers in 7.2 M LiBr solutions, as well as their recovery and recrystallization behavior, were studied. A kinetic analysis of stress relaxation in 7.2 M LiBr at a strain of 60% indicated that the controlling mechanism is an SH-catalyzed disulfide interchange with an activation energy of 22.9 kcal/mole. The recrystallization in a stable β-configuration of the chemically molten and extended keratin fibers is only possible after a structural rearrangement which removes disulfide bonds from stressed positions. If this rearrangement is prevented, the β-crystallites remain unstable even after an extended recrystallization time. Stabilization of the extended state by the formation of stable covalent cross links is not possible, unless crystallization of β-crystallites is permitted. The formation of β-crystallites alone, on the other hand, is also not sufficient to stabilize the extended state, unless the β-configuration is supported by stable covalent cross links. After a melting-extension-recrystallization cycle at 96°C, the total longitudinal deformation of the keratin fibers approaches 125%, which would correspond to the theoretical α-β-translation distance.

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Chemical Mechanism of Permanent Set

Cited by 20 publications

References 2 publications

Sulfenic Acids and Sulfenic Acid Derivatives

Sulfenic Acids and Sulfenic Acid Derivatives

Preparation of Microbiologically Resistant Wool by Means of Chemical Modification: Part I

The Stabilization of Irreversibly Deformed Keratin Fibers

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