The Preparation Of Bamboo Cellulose Carbamate And Its Solubility And Film-Forming

Cellulose carbamate (CC) has been synthesized by cellulose and urea as raw materials and could dissove in NaOH. It has many advantages such as broad source and cheap price of raw materials, clean production process, stable performance of product, good flexible production. In the production of CC, the most crucial work is to synthesize CC with certain amount nitrogen(N) content, this decide the difficulty level of follow-up works.In this dissertation, NaOH was used to activate bamboo fiber. The activated cellulose reacted with urea to form CC in N, N- dimethylformamide (DMF). In this text, the effects of some factors such as NaOH concentration, activation time, ageing time, urea pretreatment condition and esterify reaction condition on the N content of cellulose carbamate were studied. Then the optimum conditions of esterification reaction were certained. The structure and performance of CC were characterized by FTIR, DSC, XRD and SEM.FTIR indicated that, 1715 cm-1 absorption peak is carbonyl, combined with Kjeldahl determination method, we can know that cellulose reacted with urea generated CC. The higher N content of cellulose carbamate has, the more intense of the carbonyl peak in the FTIR spectra. The DSC results show that the thermal stability of cellulose carbamate is worse than cellulose. The XRD spectrum shows the crystalline form of cellulose has shifted after the esterification reaction. From the SEM photographs, fiber surface morphology become wrinkle and rough after reaction, thereby its solubility is improve.Some research works are focused on CC, however, the membrane research is still rare. So the solubility and film-forming of CC were studied in this paper. The result indicate that, concentration of NaOH, concentration of urea, solution temperature and the nitrogen content have obvious influence on the dissolution of CC. The influencing factors of CC film were studied which include CC solution concentration, coagulation bath composition, coagulation bath conditions, plasticizing condition and drying condition. The optimal solution and film-forming conditions were also determined.