Taghizadeh Mohammad Taghi, Mehrdad Abbas
Faculty of Chemistry, Department of Physical Chemistry, Tabriz University, Tabriz, Iran.
Ultrason Sonochem. 2003 Oct;10(6):309-13. doi: 10.1016/S1350-4177(03)00110-X.
Ultrasonic degradation of polyvinyl alcohol (PVA) was carried out in aqueous solution at 25 degrees C. In this experiment, the effect of solution concentration on the rate of degradation was investigated. Kinetics of degradation was studied by viscometry method. The calculated rate constants indicate that degradation rate of PVA solutions decreases with increasing of solution concentration (C= g lit(-1)). The calculated rate constants correlated in terms of reverse concentration and relative viscosity of PVA solutions. This behavior in the rate of degradation was interpreted in terms of viscosity and concentration of polymer solution. With increasing solution concentration, viscosity increases and it causes a reduction in the cavitation efficiency thus, the rate of degradation will be decreased.
在25摄氏度的水溶液中对聚乙烯醇（PVA）进行超声降解。在该实验中，研究了溶液浓度对降解速率的影响。采用粘度法研究降解动力学。计算得到的速率常数表明，PVA溶液的降解速率随溶液浓度（C = g·L⁻¹）的增加而降低。计算得到的速率常数与PVA溶液的倒数浓度和相对粘度相关。降解速率的这种行为是根据聚合物溶液的粘度和浓度来解释的。随着溶液浓度的增加，粘度增大，这导致空化效率降低，因此降解速率会下降。
