分别以蒸馏水、无水乙醇为过程控制剂，采用机械球磨法制备壳聚糖微细粉体，研究过程控制剂的种类和添加量对其产率、粒径分布、微观形貌、黏均分子量、化学结构、结晶结构以及热性能的影响。结果表明：采用无水乙醇为过程控制剂效果最好，当乙醇用量为0．75mL／g时，壳聚糖粉体的产率最高，从25％提高到94．7％，而且得到的壳聚糖粉体的粒径分布集中，D50为824nm ，D90为1629nm。采用乙醇为过程控制剂制备的壳聚糖微细粉体未发生衍生化反应，但是其黏均分子量下降了23％，结晶结构受到部分破坏，热稳性变差。
With ethyl alcohol or distilled water as process control agent (PCA) ,micron chitosan pow‐der was prepared by ball milling method .The yield rate ,particle size distribution ,micro morphology , viscosity average molecular mass ,chemical and crystal structures ,and thermal properties of these dif‐ferent micron chitosan powders were measured .The results indicate that the yield rate of micron chi‐tosan powders prepared with ethyl alcohol as PCA increases significantly ,and improves to 94.7%from 25% while the amount of ethyl alcohol is 0 .75mL/g .The particle size distribution of micron chi‐tosan powder prepared with ethyl alcohol as PCA is concentrated ,while the D50 and D90 in size are 824nm and 1629nm respectively .Chitosan do not react with ethyl alcohol used as PCA ,but the vis‐cosity average molecular mass of prepared micron chitosan pow der decreases by 23% , the crystal structures are destroyed slightly ,and its thermal stability is slightly weakened .
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