CAJ | 학술논문

以大麻秆浆和醋酸为原料制备了醋酸纤维素。考察了硫酸用量、保温温度、保温时间、醋酐用量和冰醋酸用量对醋酸纤维素取代度和聚合度的影响。采用红外光谱和X射线衍射分析对醋酸纤维素进行了表征。实验结果表明：增加硫酸用量、提高保温温度和延长保温时间可提高醋酸纤维素的取代度，但聚合度下降：增加醋酸酐用量可提高醋酸纤维素的取代度，对聚合度影响不大；增加冰醋酸用量可提高醋酸纤维素的聚合度，对取代度影响不大。制备醋酸纤维素的适宜条件为：硫酸、醋酸酐和冰醋酸对大麻秆浆的质量比分别为0．13、9．0和9．0，保温温度为50℃，保温时间为1h。该条件下制备的醋酸纤维素取代度为2．92，聚合度为121。由醋酸纤维素的红外光谱可证实纤维素与醋酸酐之间醋化反应的发生。X射线衍射分析表明大麻秆浆经醋化反应后，纤维素晶型发生了明显的变化。
이대마간장화작산위원료제비료작산섬유소。고찰료류산용량、보온온도、보온시간、작항용량화빙작산용량대작산섬유소취대도화취합도적영향。채용홍외광보화X사선연사분석대작산섬유소진행료표정。실험결과표명：증가류산용량、제고보온온도화연장보온시간가제고작산섬유소적취대도，단취합도하강：증가작산항용량가제고작산섬유소적취대도，대취합도영향불대；증가빙작산용량가제고작산섬유소적취합도，대취대도영향불대。제비작산섬유소적괄의조건위：류산、작산항화빙작산대대마간장적질량비분별위0．13、9．0화9．0，보온온도위50℃，보온시간위1h。해조건하제비적작산섬유소취대도위2．92，취합도위121。유작산섬유소적홍외광보가증실섬유소여작산항지간작화반응적발생。X사선연사분석표명대마간장경작화반응후，섬유소정형발생료명현적변화。
Cellulose acetate was prepared from hempen pulp and acetic anhydride. Effects of sulfuric acid amount, temperature, reaction time, acetic anhydride and glacial acetic acid amount on degree of substitution （DS） and degree of polymerization （DP） of cellulose acetate were studied, and cellulose acetate was characterized by infrared spectroscopy （IR） and X-ray diffraction （XRD）. Results showed that DS was increased with sulfuric acid amount, temperature and reaction time, and DP was reduced accordingly. DS was increased with acetic anhydride, and DP was increased with glacial acetic acid amount. The suitable condition of preparing cellulose acetate was determined as follow： 0.13 sulfuric acid, 9.0 acetic anhydride, 9.0 glacial acetic acid （mass ratio to hemp pulp）, 50℃, and 1 h time. In the condition, DS was 2.92, and DP was 121. Acetylation of hempen pulp was confirmed by IR and XRD.