Preparation Of Super Slim Strong Fiber With High Molecular Bacterial Cellulose And The Evalution Of Impregnated Silver Fiber

The microbial cellulose known as Bacterial bio cellulose (Bacterial cellulose, BC) is a type of high molecular produced by bacteria, which was discovered by the British scientists in1886at Brown. In order to differentiated it and the plant cellulose, we call it as "microbial cellulose" or "bacterial cellulose". Based on a wealth of sources、environment friendly、excellent performance, microbial cellulose is widely concerned by the scholars from all of the word. Right now, as a new type of environmentally friendly synthetic materials, microbial cellulose have been applied in food industry、medical materials、paper making、 acoustic equipment,etc., but the ultra slim strong fiber aspect has not been reported yet. This topic use microbial cellulose powder as raw material, with8%(mass fraction) LiCl/DMAC system for solvent to made microbial cellulose spinning dope. The paper use wet spinning to made the renewable biological fibers, which including three levels of coagulation bath. We discussed the different stages of drafting effect the preparation of surplus of microbial cellulose fiber, finally the rupture strength is up to1.0576GPa. For further development of the microbial cellulose, on the basis of the super slim strong fiber, we use the in situ reduction method to load the silver on the fiber. At the same time, we studied the silver particle size distribution on the fiber surface and its antibacterial、antiseptic properties. Following is the specific research content:1. Tested the basic properties of microbial cellulose powder including: viscosity-average、IR structure, XRD, in N2and Air atmosphere (Air) under the condition of thermal analysis, etc.2. On the basis of the primary coagulation bath, we further studied the secondary coagulation bath and the three levels of coagulation bath drafting effect the microbial cellulose fiber mechanical properties (diameter, breaking strength, elongation at break)、apparent morphology、 crystal structure、electron microscope, etc. The result shows that at the draft of1.16times, we prepared the super slim microbial cellulose fiber.3. By the in situ reduction of chemical methods, we explored the microbial cellulose fiber upload silver process conditions. We select three different concentration of silver nitrate solution and four different soaking time, using ICP verified the existence of fiber surface silver ions, and characterization of microbial cellulose fiber, SEM morphology after silver, compared the diameter of the mechanical properties, fracture strength, elongation at break.4. Using the picture of SEM, we counted the particle distribution of the silver fiber.5. Studied the microbial cellulose fiber silver antibacterial, antiseptic properties.