Hydrolytic Cleavage

Water Reaction

Water molecules attack polar carbonyl groups along synthetic polymer backbones at elevated temperatures. During hydrolytic cleavage, hydroxyl and carboxyl end-groups form as polymer chains split into lower molecular weight fragments. The accumulation of carboxylic acid end groups further accelerates autocatalytic degradation within polyester melt structures.

Elevated Moisture

Drying polyester resin chips with high ambient humidity accelerates chemical degradation prior to fiber extrusion. High-pressure dyeing of polyester fabrics at one hundred thirty degrees Celsius causes hydrolytic cleavage if dye bath pH deviates from weakly acidic conditions. Over-steaming nylon fabrics during heat setting also cleaves amide bonds, causing loss of yarn tenacity and increased dye uptake variability.

Finishing mills monitor wash bath pH and drying moisture levels to prevent chain rupture.

Intrinsic Loss

Intrinsic viscosity testing measures the loss of polymer molecular weight following thermal moisture processing. When hydrolytic cleavage drops polyester intrinsic viscosity below zero point six zero decilitres per gram, spun yarn tensile strength fails technical specifications. Quality control units reject degraded yarn lots before knitting or weaving operations.