Ultrasonic degradation of ۲-hydrox yethylcel lulose: Eff ect of molecular mass, concentration, volume an d power in put

The degradation of polymers can occur be cause of he at, light, ch emical reag ents or ultrasonic radiation. Ultrasound has been used for deg radation of a wide range of polymers. In the fi eld of polymer chemistry, polymer degradation is usually quantified either by molecular w eight distribution or by change in the intrinsic viscosity. In general, it can be sai d that ultrasonic irradiation does have a significant effect o n polymers in terms of its mechanical, mechano- chemical and morph ological pro perties. Hydroxyethyl cellulo se (HEC), o ne of the most importa nt cellulose derivatives, can be employed in extens ive utilizati ons because of its wonderful water-solution properties and the chemical composition with a l arge amount of relativel y easily acc essible hydr oxyl units. U nderstandin g the effect of different op erating para meters on the extent of degradatio n of HEC th us becomes very important [۱,۲].

کلیدواژه ها:

Ultrasonic degradation ، Hydroxy ethylcellulo se ، rate constant ، viscosity ، kinetic model.