不同干燥方式对微晶纤维素性能的影响

Effect of different drying methods on the properties of microcrystalline cellulose

在同一工艺条件下,制备微晶纤维素试样,并研究了鼓风、真空、冷冻和喷雾干燥对其结晶度、粒径分布和微观形貌的影响.利用X射线衍射仪对试样的衍射峰位和结晶度值进行了表征.用激光粒度仪对试样的粒径大小及分布情况进行了测试.用环境扫描电镜对试样的微观形貌进行了观察分析.结果表明,喷雾干燥处理后的微晶纤维素结晶度值大且粒径小,粒子分布更均匀,纤维挺硬,表面光滑且较为完整,长度较均一,破裂少.因此,对比发现喷雾干燥更适合与微晶纤维素的制备及应用.

Under the same conditions, the microcrystalline cellulose samples were prepared, and the effects of blowing,vacuum,freezing and spray drying on the crystallinity,particle size distribution and microstructure were studied . The diffraction peaks and crystallinity of the samples were characterized by X ray diffractometer. The particle size and distribution of the samples were tested by laser particle size analyzer. The microscopic morphology of the sam-ples was observed by Environmental Scanning Electron Microscope （ESEM）. The results showed that the microcrystalline cellulose handled by spray dry had a higher crystallinity val-ue and the particle size was small and distributed uniformly. The fiber was hard and the sur-face was smooth and complete,the length is uniform and the cracking was less. Therefore,tt was found that spray drying was more suitable for the preparation and application of micro-crystalline cellulose.