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采用自制醋化级竹浆粕制取三醋酸纤维素,探讨制备过程中不同活化工艺及醋化工艺下制得三醋酸纤维素聚合度及取代度的变化情况,通过确定适合的聚合度及取代度优化制备工艺。研究表明活化过程中加大活化剂醋酸的用量对聚合度影响不大,取代度则为先随醋酸用量增大而增大,而后反而有所下降;活化过程中温度、时间、浓硫酸用量各因素的提高均可增加三醋酸纤维素的取代度,但均会使聚合度降低;另外在醋化反应中分别提高醋化温度、时间、醋酸、醋酐及浓硫酸用量同样可增加三醋酸纤维素的取代度,但也同样会导致聚合度的降低。
The preparation of triacetate cellulose from homemade vinegar-grade bamboo pulp was used to investigate the changes of degree of polymerization and substitution degree of cellulose triacetate prepared under different activation processes and vinegar-making processes in the preparation process. By determining suitable polymerization degree and substitution Degree of optimization of preparation process. The results showed that the amount of acetic acid used in the activation process had little effect on the degree of polymerization. The degree of substitution increased with the increase of the amount of acetic acid and then decreased. The temperature, time and the amount of concentrated sulfuric acid Factors can improve the degree of substitution of cellulose triacetate, but will reduce the degree of polymerization; addition in the vinegar reaction were increased vinegar temperature, time, acetic acid, acetic anhydride and concentrated sulfuric acid can also increase the amount of triacetate fiber Substitution degree, but also will lead to a decrease in the degree of polymerization.