三醋酸纤维素的结构与性能研究

Structure and Properties of Cellulose Triacetate

采用乙酸酐/乙酸/硫酸体系制备了三醋酸纤维素(CTA),运用IR,化学滴定,1H-NMR,X射线衍射,DSC等手段对产物的结构及性质进行了表征和测试。结果表明,所合成的CTA结合醋酸质量分数均达到60%以上。与纤维素相比,CTA的晶型发生了明显变化,结晶度也降低到30%左右。同时,所制备的CTA的DSC谱图中都出现了明显而完整的熔融峰。

Cellulose triacetate（CTA）was prepared in the presence of mixture of acetic anhydride/acetic acid/H2SO4. The structure and properties of cellulose triacetate acetylation were determined by IR, ^1H-NMR,XRD,DSC and chemical analysis. The results showed that acetyl mass fraction of all CTA samples were at least 60%, the most active reaction position on the anhydroglulose unit was C-6. Compared with that of cellulose, the crystallinity of CTA was much lower, but the processability was improved a lot.