Preparation and Morphological Properties of Regenrated Bacterial Cellulose

• 1、College of Wood Science & Technology, Nanjing Forestry University, Nanjing 210037

Abstract：This paper demonstrates the dissolving properties and preparation of bacterial cellulose. The best dissolution coditions: BC could be dissolved in lithium chloride (LiCl) / dimethyl acetamide (DMAc) solvent system after activated in 10% ethylene diamine. Then heating and agitating the obtained sample in 80 ℃ ~ 100 ℃ oil bath with slow stirring for 3h, cooling it to room temperature, at last, the transparent bacterial cellulose solution could be prepared. The optimal conditions to prepare regenerated bacterial cellulose membrane(RBC): coagulation concentration of DMAc was 30%, coagulation time was 9min, then soaking it in distilled water for 24h, and plasticized by 10% glycerol for 1h, At last, the sample was washed with plenty distilled water as well as affixed to the flat glass to dry thoroughly. Through scanning electron microscopy imaged, it could been seen that the film surface was smooth and compact with fine network structure. FIIR photos showed that bacterial cellulose didn't have derivative reaction during the dissolution process.

Keywords： Bacterial Cellulose (BC) lithium chloride(LiCl) /dimethyl acetamide(DMAc) dissolving system regenerated BC membrane (RBC)