The Study Of The Dissolution Of Cellulose In New Ionic Liquid And Properties Of The Forming

With the development of consciousness of environmental protection and health, integrated control of environmental pollution, especially the "white pollution", is becoming more and more important. Preparation of green cellulose membrane material using renewable resource not only can effectively control the environmental pollution from traditional refractory high polymer material, but also can slow down dependence on non-renewable resources such as coal and oil. Natural cellulose are mainly made from wood which is relatively deficient in china, besides that, cellulose dissolution problems also greatly limits the progress of industrialization.In this study, cellulose was extracted from herb mat grass which was rich in china and then be dissolved in homemade environment-friendly solvent- ionic liquid: 1-allyl-3-methylimidazolium chloride([Amim]Cl), in which cellulose membrane could be prepared using precipitation gel method. Main content is as belows:Firstly, direct synthesis method was used to prepare ionic liquid and synthetic product was proved to be [Amim]Cl by nuclear magnetic resonance, purity of ionic liquid could be up to 99.82%. It is an excellent solvent with low melting point, low viscosity, good thermal stability and solubility etc.Secondly, the cellulose contained in mat grass was extracted by the method of chemical scouring. Dissolution and regeneration of the cellulose in the [Amim]Cl were studied, mechanism was also investigated preliminary. Cellulose crystal was proved to be changed from cellulose I to the cellulose II after regeneration by Fourier transform infarared spectrum(FT-IR) and X ray diffraction(XRD), without derivatizayion reaction in regeneration process.Thirdly, the mechanics property、separation property and thermal stability were studied using the single factor experiment and orthogonal experiment. the optimum film conditions were as follows: dissolving temperature was 105 ℃, cellulose concentration was 6%, concentration of glycerol was 20%, coagulation bath temperature was 30℃. The structure of cellulose membrane was made up of dense epidermis and porous supporting layers by scanning electron microscopy(SEM). Thermal stability was decreased slightly compared with the previous regeneration by thermo-gravimetric analysis.The experimental scheme was optimized by adding modifiers, and the effect of degree of polymerization of the cellulose on the membrane property was also studied. Experiments showed that excessive degradation of cellulose could be limited effectively by ascorbic acid, property of membranes could be changed by adding nanoSiO2 and TiO2, reaction time could be reduced by some modifiers,such as NH4 Cl and DMSO.Regeneration membrane that was made from grass seat has similar properties compared with cellulose membrane from cotton pulp and wood pulp.