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采用高压蒸汽闪爆技术对天然棉纤维素进行预改性处理,以硝硫混酸作为硝化剂,对改性后的纤维素进行硝化,并对硝化产物的含氮量、硝酸酯基分布的均匀性以及在有机溶剂中的溶解度进行测试。结果表明:与未经改性处理的纤维素制得的产物相比,利用闪爆改性后的纤维素制得的硝化纤维素含氮量有一定的提高,氮量分布的均匀性有较大程度的提高。但当闪爆压力超过一定的值时,会导致纤维原料发生类酸解和机械降解,对硝化产物溶解度有较大的影响。
High-pressure steam explosion technology was used to pre-treat natural cotton cellulose. Using nitric-sulfur mixed acid as nitrating agent, the modified cellulose was nitrified, and the content of nitrification and nitrogen nitrate were uniform As well as the solubility in organic solvents. The results showed that the nitrogen content of nitrocellulose prepared by using flash-modified cellulose increased to a certain extent compared with that of unmodified cellulose, and the uniformity of nitrogen distribution was better To a large extent improved. However, when the flash explosion pressure exceeds a certain value, it will lead to fiber-like materials such as acid-base acid hydrolysis and mechanical degradation, nitrification product solubility has a greater impact.