Reactive tendering: The electron-withdrawing inductive effect of reactive dyes on acid hydrolysis of β-1,4-glucosidic bonds

Yiqi Yang, Jane E. Hughes

Research output: Contribution to journalReview article

6 Citations (Scopus)

Abstract

The mechanism of reactive tendering, the strength loss of cellulosics that occurs after reactive dyed cotton fabrics have been commercially laundered, is discussed. The effect of acid solubilizing groups of the dyes, the electrolytes used for reactive dyeing, and the pH during souring on reactive tendering as well as the electron-withdrawing inductive effect of the reactive groups are examined. The results indicate that reactive tendering is caused by the electron-withdrawing inductive effect of the bonded dyes. This inductive effect accelerates the acid hydrolysis of β-1,4-glycosidic linkages of cellulose, so that the reactive dyed cellulosics are more easily hydrolyzed than the undyed fabrics during pressing. Pressing, which is conducted at a high temperature and low pH, occurs after acid souring in commercial laundering. The stronger the electron-withdrawing ability of the dye, the greater the tendering tendency of the dyed cellulosics during pressing.

Original languageEnglish (US)
Pages (from-to)23-29
Number of pages7
JournalTextile Chemist and Colorist
Volume29
Issue number11
StatePublished - Nov 1 1997

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Hydrolysis
Coloring Agents
Dyes
Acids
Electrons
Laundering
Cotton fabrics
Cellulose
Dyeing
Electrolytes
Temperature

Keywords

  • Acid Hydrolysis
  • Commercial Laundering
  • Electron-Withdrawing Effect
  • Reactive Tendering

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Reactive tendering : The electron-withdrawing inductive effect of reactive dyes on acid hydrolysis of β-1,4-glucosidic bonds. / Yang, Yiqi; Hughes, Jane E.

In: Textile Chemist and Colorist, Vol. 29, No. 11, 01.11.1997, p. 23-29.

Research output: Contribution to journalReview article

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N2 - The mechanism of reactive tendering, the strength loss of cellulosics that occurs after reactive dyed cotton fabrics have been commercially laundered, is discussed. The effect of acid solubilizing groups of the dyes, the electrolytes used for reactive dyeing, and the pH during souring on reactive tendering as well as the electron-withdrawing inductive effect of the reactive groups are examined. The results indicate that reactive tendering is caused by the electron-withdrawing inductive effect of the bonded dyes. This inductive effect accelerates the acid hydrolysis of β-1,4-glycosidic linkages of cellulose, so that the reactive dyed cellulosics are more easily hydrolyzed than the undyed fabrics during pressing. Pressing, which is conducted at a high temperature and low pH, occurs after acid souring in commercial laundering. The stronger the electron-withdrawing ability of the dye, the greater the tendering tendency of the dyed cellulosics during pressing.

AB - The mechanism of reactive tendering, the strength loss of cellulosics that occurs after reactive dyed cotton fabrics have been commercially laundered, is discussed. The effect of acid solubilizing groups of the dyes, the electrolytes used for reactive dyeing, and the pH during souring on reactive tendering as well as the electron-withdrawing inductive effect of the reactive groups are examined. The results indicate that reactive tendering is caused by the electron-withdrawing inductive effect of the bonded dyes. This inductive effect accelerates the acid hydrolysis of β-1,4-glycosidic linkages of cellulose, so that the reactive dyed cellulosics are more easily hydrolyzed than the undyed fabrics during pressing. Pressing, which is conducted at a high temperature and low pH, occurs after acid souring in commercial laundering. The stronger the electron-withdrawing ability of the dye, the greater the tendering tendency of the dyed cellulosics during pressing.

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