Cellulose Film Preparation and Properties Research

Using a new system of NaOH/thiourea/urea as the solvent to dissolve the cellulose,then filtrating and degassing the solution,last obtaining a clear cellulose solution.Different cellulose films were produced from different coagulations such as H2SO4,HOAC(CH3COOH),H2SO4/Na2SO4.The morphology and mechanical property of cellulose films were investigated through SEM,XRD and tensile test.The optimum solidification temperature of cellulose film is 20℃,and different optimal concentration of coagulation bath and the coagulation time are H2SO4-5%-3min,HOAC-9%-3min,H2SO4/Na2SO4-7%/9%-5min.The best coagulation bath and its solidification conditions are H2SO4/Na2SO4-7%/9%-5min,20℃.The cellulose film has an uniform density of hole structure,its strength and elongation at break are 166.2MPa-13.5%,respectively.