Optimization of Dissolving Process and Properties of Bacterial Cellulose with Ionic Liquid

In order to supply a new way of dissolving bacterial cellulose,inventory,ratio of double solvents,dissolving temperature were studied during BC dissolving in ionic liquid (1-allyl-3-methylimidazolium chloride,AmimCl). Meanwhile,the properties of BC before and after IL-dissolving were compared through Fourier Transform Infrared (FT-IR),X-ray diffraction (XRD),scanning electron microscope (SEM),and thermogravimetric analysis-differential scanning calorimetry (TG-DSC).According to the results of single factor experiments,the optimal dissolving process was determined as follows:dissolution temperature was 110℃,ratio of double solvents was 8:2 (AmimCl:DMI),dissolution time was 11 h,the mass fraction of BC in BC/IL solution could reach to 6.5%. The process of dissolving BC with Ionic liquid was a kind of physical process,which would not destroy the basic structure of BC. However,the crystallinity and thermal stability of BC after dissolving and regeneration decreased compared to BC before dissolving. More cracks and holes appeared on the surface of regenerated BC fiber,and the accumulation of micro fibers became loose. This study provided a new idea for BC dissolution during its practical application,and laid a theoretical and technical foundation for BC modification.