Polymer Cross Linking Density and Hydrolysis in Repeated Wet Processing
Crosslink density decay during repeated wet processing dictates the trade-off between durable crease recovery and catastrophic fabric tear strength loss.
CUEN Hydroxide
Dissolving Solvent
Alkaline solvent systems are widely employed in textile laboratories to dissolve cellulose and evaluate the degree of polymerization in cotton fibers. The chemical reagent known as CUEN hydroxide dissolves untreated cotton by forming a complex with the hydroxyl groups of the glucose units. It provides a reliable medium for studying the physical state of the underlying polymer chains.
Degradation Assessment
Crosslinked cotton fibers do not dissolve in this solvent because the covalent bonds prevent the separation of the cellulose chains. When a chemist uses CUEN hydroxide, the solubility of the sample indicates the level of chemical finishing or chemical damage the fibers have experienced.
Viscosity Measurement
Flow time of the dissolved polymer solution through a capillary tube reveals the average molecular weight of the cellulose. If the fiber has suffered severe chemical degradation, the CUEN hydroxide solution shows low viscosity.
Industrial Verification
Mill inspectors use this chemical test to verify that bleached or finished fabrics have not been weakened by harsh scouring and bleaching processes. By monitoring the viscosity of the dissolved cotton, they ensure the scouring line does not ruin the durability of the fiber. Viscosity testing represents a major quality gate in high-end cotton finishing before garments are produced.