论文部分内容阅读
Cellulose acetates(CAs) are important derivatives of cellulose as a result of substituting acetyl groups for hydroxyl group.1 The most popular cellulose acetates are cellulose diacetate(CDA) with an average degree of substitution(DS) ranging from 2.2 to 2.7 and cellulose triacetate(CTA) having average DS above 2.7.2 They have many applications in fibers,plastics,films,membranes and so on.