葡聚糖超声降解的反应动力学研究

Study on the reaction kinetic model of dextran polymers during ultrasonic degradation

以葡聚糖为研究对象,在超声波的作用下,对其进行降解。实验发现在一定范围内,葡聚糖的初始分子量越大,降解速率R值越大。通过借鉴Vijayalakshmi的超声降解模型,对超声降解葡聚糖的分子量分布数据进行拟合,得到不同分子量葡聚糖超声降解的动力学方程,表征了分子量分布随时间的关系,为超声降解葡聚糖的分子量控制的可行性提供了理论基础。经实验验证,该动力学模型具有良好的精度和应用性,可用来预测一定超声时间内的葡聚糖分子量分布。

The subject investigation of this study is dextran that was degraded under the effect of ultrasonic. Results found that R value of degradation rate increased with higher initial molecular weight of dextran in a certain range. By drawing from the ultrasonic degradation model of Vijayalakshmi,fitting the molecular weight distribution data of ultrasonic degradation of dextran,the kinetic equation of the degradation of different molecular weight dextran was obtained,which characterized the relationship of molecular weight distribution with time,and provided a theoretical basis for the feasibility of molecular weight control through the ultrasonic degradation of dextran. The experimental results show that the kinetic model with favorable accuracy and applicability is available to predict the molecular weight distribution of dextran in a certain ultrasonic time.