超声波活化处理对微晶纤维素结构和氧化反应性能的影响

采用无污染的超声波技术预处理微晶纤维素, 研究了微晶纤维素在活化前后的超分子结构、形态结构和可及度的变化, 超声波活化对微晶纤维素选择性氧化性能的影响.

Influence of Ultrasonic Wave-activating Treatment on Structure and Oxidation Reactivity of Microcrystalline Cellulose

Microcrystalline cellulose(MCC) was activated with ultrasonic wave. The changes in supramolecular structure and morphology structure of MCC were studied by XRD and SEM. The influence of ultrasonic treatment on accessibility and oxidation reactivity of MCC with periodate sodium was investigated. The mechanism of the change of reactivity after ultrasonic treatment was discussed. The results showed that crystalline type of cellulose was not changed and no significant changes in crystalline size of cellulose were observed. However, after treatment with ultrasonic wave the crystallinity of cellulose decreased and morphology changes of the treated MCC was significant. These changes contributed to the increase of specific surface area and WRV, which implied the increase of accessibility. The reactivity of MCC with periodate sodium was successfully improved after ultrasonic treatment. The aldehyde content of its oxidized products dialdehyde cellulose(DAC) was improved from 71.3% to 85.0%. As the increase of ultrasonic treating time the aldehyde content first increased and then decreased.