中文摘要：

研究了氧气在不同壳聚糖溶液初始质量浓度、p H值、温度、进口压力、空化时间等条件下,对壳聚糖涡流空化降解的影响。结果表明：壳聚糖溶液的初始质量浓度越低涡流空化降解效果越好,当溶液p H值为4.4、温度为70℃、进口压力为0.4 MPa、空化时间为3 h时,壳聚糖的特性黏度下降率最高;在不同涡流空化降解条件下,连续通入氧气均可显著促进壳聚糖降解产物特性黏度下降率的提高,在本实验中最大可提高35.36%;氧气对高质量浓度壳聚糖降解的促进作用更显著;氧气的通入减弱了p H值对壳聚糖降解的影响、在反应的初期大大加快了反应速率;降解后的壳聚糖主链结构及官能团基本没发生变化。

英文摘要：

In this research, the effect of oxygen on the degradation of chitosan by swirling cavitation under different conditions of initial concentration of chitosan solution, p H, temperature, inlet pressure and cavitation time was studied. The results showed that low initial concentration of chitosan solution resulted in better degradation efficiency of swirling cavitation. When the following conditions were used： solution p H, 4.4; temperature, 70 ℃; inlet pressure, 0.4 MPa; and cavitation time 3 h, chitosan solution showed the largest decline in intrinsic viscosity. Under each of the tested conditions, continuous feeding of oxygen significantly augmented the decrease in intrinsic viscosity, which could result in the maximum improvement of 35.36%. The effect of oxygen on the degradation of high chitosan concentration was more significant. p H impact on the degradation of chitosan was weakened, and the reaction rate was greatly accelerated in the early stage of the reaction as a result of increased oxygen supply. The major chain structure and functional groups of chitosan after degradation were not changed.