Preparation Of Bacterial Cellulose And Research On Its Structure And Property

The influences of fermentation conditions and substrate components on bacterial cellulose produced by Acetobacter xylinum is studied in this paper. The optimum technology is gotten. Watermelon juice is used as substrate to produce bacterial cellulose for the first time, the result is as good as we thought.The structure and properties of bacterial cellulose are studied by all kinds of equipments and methods. SEM indicates that the product has minuteness and net microstructure. Element analysis shows that the contents of C,H,O in the product are accordance with their contents in common cellulose. The infrared spectrum has the result that the groups in molecules of the product belong to cellulose. X-ray diffraction is used to test the crystal type of the product, and heat weightlessness analysis studies its thermal property. Water-holding property of bacterial cellulose and its adsorption to mental cations are tested in this paper, the results indicate that the product has excellent water-holding property and strong adsorption to Cu²⁺. Bacterial cellulose can be dissolved in LiCl/DMAC,NMMO·H2_O and formic acid, but not in solvents of sodium hydroxide/urea sodium,hydroxide/thiourea and lithium hydroxide/urea.Bacterial cellulose dissolved in NMMO is treated on PET fabric, the hydrophile and antistatic properties of the fabric are improved greatly, which can endure washing in some extent. However, the physical and mechanical properties of the fabric are influenced too. That is, gas permeability and whiteness of the fabric decline, the breaking strength and tearing strength change little.Bacterial cellulose has many unique properties, the studies in this paper has built the foundation to develop its applycation on textile, and hopefully it can open new field for hydrophile treatment of PET fabric.