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Preparation and properties of cellulose/NMMO solution and membrane

Zhang Wei,Chen Chaojian,Fu Shishen (College of Light Industry,Textile and Food,Sichuan University,Chengdu 610065)  
A cellulose/ N-methyl morpholine-N-oxide(NMMO) solution with the mass fraction of 5%-11%was prepared by dissoloving cotton pulp with NMMO containing 13.3%water by mass fraction as a solvent.The obtained solution was used to prepare cellulose membrane.The stability of cellulose/NMMO solution was investigated.The effects of coagulation bath temperature and composition on the formation,fracture morphology and mechanical properties of the cellulose membrane were studied.The results showed that the viscosity of the cellulose/NMMO solution increased,then decreased and finally appeared a steep rise while increasing the solution concentration.The cellulose/NMMO solution exhibited fairly good stability in glass medium.The exitence of trace Cu~(2+) and Fe~(3+) caused the stability to decline obviously.The transparency,tensile strength and elongation at break of the cellulose membrane were decreased while elevating the coagulation bath temperature.As compared with water,the coagulation bath containing ethanol and NMMO can depress the double diffusion speed,slightly increase the tensile strength and decrease the elongation at break in different degree.
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