셀룰로오스 아세테이트의 액정복합체

Liquid Crystal Composite of Celloulose Acetate

Mixtures of cellulose acetate(CA) with poly-4-vinyl pyridine(PVP), polymethyl methacrylate(PMMA) , and polyethylene oxide(PEO) in various weight proportions were prepared in a mixed solvent of trifluoroacetic acid : methylene chloride/6:4(v:v). The properties of the mixed solutions and the films cast from the solutions were examined. CA was not miscible with PEO, whereas, it was quite miscible with PVP and PMMA in that solvent system. The solutions of CA/PVP and CA/PMMA showed mesomorphic phases with cholesteric nature in a certain range of concentration. The phase behavior of the solutions was optically investigated by using a polarized light microscope. The films cast from liquid crystal solutions of CA/PVP and CA/PMMA were characterized by empolying IR, DSC, and SEM techniques. It was observed that CA was compatible with PVP and PMMA in soiled state as well. This indicated that CA was dispersed molecularly in the continuous phase of PVP or PMMA.