Reaction mechanism of dye and cellulose
The bonding behavior of dye and
cellulose are mentioned below:
1. Hydroxyl group of cotton polymer takes part
in reaction with reactive group of dye
2. Reactive
group of dye react preferably with the hydroxyl group of cellulose than that of
water.
3. The
activation energy of dye – water reaction is 16.4 – 26.2 kcal and that of dye
cellulose is 9.2 – 15.8 kcal. As the latter is less, so that occurs
predominately.
4.Higher
activation energy causes slower reaction.
5.The
reaction with water and dye takes place in a smaller extent.
6.The
strength of covalent bond formed between cellulose polymer and reactive group
is more than hydrogen bonding, vander wall’s force of attraction and metal
co-ordination bonds.
7.Extreme
acidic and alkaline condition should be avoided, otherwise hydrolysis will take
place resulting bond breakage and poor wash fastness.
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