Determining Dry Mass Ratios in Cotton Synthetic Blends
Determining dry mass ratios requires desiccation at 105 °C, selective chemical dissolution under ISO 1833, d-factor correction, and commercial regain adjustments.
Cellulosic Hydrolysis
Chemical Degradation
A chemical reaction breaks down the polymer chains of cellulose through exposure to acids or specific enzymes. In textile finishing, cellulosic hydrolysis is often used to soften fabrics or create stone-washed effects on denim. The reaction must be carefully controlled to prevent complete destruction of the textile structure, as excessive exposure rapidly dissolves the cotton yarn.
The chemical treatment ceases when the pH is adjusted to a neutral range.
Polymer Breakdown
Acid catalysts target the amorphous regions of the fiber, cleaving the glucosidic bonds and reducing the degree of polymerization. This action softens the cotton or rayon fabric but also decreases its tensile strength. The process is terminated by neutralizing the bath with an alkaline solution.
Strength Reduction
Enzymatic treatments offer a more selective pathway by using cellulase enzymes to remove protruding fibers from the yarn surface. This bio-polishing treatment improves the fabric’s resistance to pilling and enhances the surface appearance. The reaction stops when the temperature is raised to denature the enzymes.
Treatment Boundary
Quality control laboratories test the treated fabrics for loss of tear strength and weight to ensure the degradation has not exceeded safe limits. Excessive hydrolysis can make garments brittle and prone to tearing during normal wear. This reaction does not occur in fully synthetic fibers like polyester or nylon.