Characterization of Chitosan-carboxymethyl Cellulose Blended Membrane

Carboxymethyl cellulose-chitosan(CMC-CS) blended membranes with different weight ratios(1∶2,1∶1,2∶1) were prepared by co-solution method.The structure of membranes was characterized by FT-IR and SEM.The thermal property of membranes was characterized by DSC.The properties of CMC-CS were evaluated by uniformity,acid resistance,tensile strength and absorption rate.The intermolecular mechanism was analyzed.The results indicated that CMC and CS generated polyelec-trolyte through electrostatic and hydrogen-bond interactions.The intermolecule bonds of CMC-CS membranes were degraded between 170℃ and 330℃.At 217.4℃,the ionic bonds were fractured and the electrostatic interaction disappeared.The CMC-CS membrane with a weight ratio of 1∶1 was the ideal membrane,whose electrostatic interaction between CS and CMC was the highest.Tensile strength of the CMC-CS membrane reached 34.44MPa,which was 64.47% higher than CS membrane.The maximal acid adaptability was decreased from pH value 5 to 4,and tensile strength of CMC-CS membrane was 25.71MPa after dunking at pH value 6.The water-swelling rate of CMC-CS membranes was effectively reduced.