engleski

Topochemical Modification of Poly (Ethylene Terephtalate) Ffibers : Kinetic of Fiber Aalkaline Hydrolysis

Alkaline polyester hydrolysis is topochemical saponification of polyester fibers that results in fiber weight loss, reducing of diameter and strength of fibers as well. The effect of hydrolysis is better look of fabric, which becomes more like pure silk. In practice the alkaline hydrolysis is done by a relatively concentrated aqueous sodium hydroxide solution at elevated temperature (T= 90-1200C). Some cationic compounds like cationic surfactants accelerate this hydrolysis yielding much higher weight loss of polyester fabric. In order to obtain the optimal and uniform effects the proper stirring, controlled NaOH concentration, temperature, addition of accelerator and mass to volume ratio is needed. Developed physicochemical model describing kinetic of hydrolysis of polyester fiber in alkaline solution was applied for analyzing of experimental data. The influence of temperature effect is considered on the basis of the Arrhenius activation energy (Ea.). The model takes into account the decrease of surface area and OH ion concentration describes the process completely by first order rate constant. In the present work the effect of different compounds, cationic surfactant and 3-chloro-2hydroxylpropyl trimethyl ammonium chloride (CHPTAC) on kinetic of alkaline dissolution of polyester fiber is discussed on the basis of theoretical model.

PET fabrics ; alkaline hydrolysis ; kinetic model ; cationic compounds

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