Study On Preparation And Properties Of Functional Cellulose Materials

As a result of Cellulose have great advantages such as abundant in resource, renewable and environment friendly and so on, So cellulose can be used in many fields. In this experiment, We have prepared Nanofiber-based Cellulose composite membrane, High water absorption of Cellulose sponge, flexible conductive polypyrrole/cellulose sponge composite material. These materials was appliccated in the separation and purification and biomedical and pressure sensors, respectively.The research content of this paper as follows:First of all, We used PP spun-bonded nonwoven as support layer, PVA-co-PE nanofibers for particle size of the middle transition layer and Cellulose as intercept layer to prepare PVAco-PE nanofibers-based cellulose composite membrane. We mainly explore the forming bath, concentration of coating Cellulose solution and cellulose coating thickness, The intercept performance, influence of water flux and anti-fouling of PVA-co-PE nanofiber-based Cellulose composite membrane.The results show that: when the concentration of coating solution of 10wt%, cellulose coating thickness of 86 um, and 25 oC deionized water as forming bath to prepared by PVA-co-PE nanofiber-based Cellulose composite membrane which show good retention rate of water flux and anti-fouling performance.Secondly, high water absorbent cellulose sponge was prepared by freezing method,in which NaOH/Urea aqueous solution was used as solvent system, microcrystalline cellulose was as the raw material, anhydrous sodium sulfate was the pore-forming agent and combed cotton was used as the reinforced fibers. The effect of microcrystalline cellulose powder concentration, reinforced fibers concentration, pore forming agent amount and particle size on the morphology, water absorption, and mechanical properties were studied. The results show that the microcrystalline cellulose powder concentration, reinforced fibers concentration, pore forming agent amount and particle size were key parameters which could affect the performance of cellulose sponge.We prepare polypyrrole/cellulose sponge composite material via in situ polymerization pyrrole on the cellulose sponge. The effect of the bath ratio of 1:200 under the condition of different reaction time and reaction time for 60 min under the conditions of different bath ratio on influence the conductivity and the weight of increase of the polypyrrole/cellulose sponge composite material. And preliminary explore the polypyrrole/cellulose sponge composite material application in flexible pressure sensor.