Polymer Modification
Chemical finishing of cotton fabrics utilizes multi-functional agents to bind adjacent carbohydrate chains together and improve dimensional stability. Applying cellulose crosslinking to woven goods reduces the tendency of the fabric to shrink or crease during laundering. This finish locks the molecular structure in a flat configuration.
Reaction Mechanism
Covalent bonds form between the hydroxyl groups of neighbouring cellulose chains when the reactant is heated in the presence of an acid catalyst. This networks the polymer chains, preventing them from sliding past one another under wet conditions.
Curing Temperature
Industrial dryers must reach specific activation levels to complete the chemical bond formation. If the temperature is too low, the reaction remains incomplete, whereas excessive heat burns the fabric and triggers yellowing. Precise dwell times in the oven ensure the finish cures evenly without tenderising the cotton fibres.
Performance Tradeoff
Reduced tear strength and loss of moisture absorption represent the primary drawbacks of this chemical modification. Because the locked polymer chains cannot slide to distribute mechanical loads, applied stresses concentrate in local areas and lead to easier tearing. Mill technicians must balance the wash-and-wear performance against the loss of physical durability by adjusting the chemical concentration of the finishing bath.
