Orientation of cellulose triacetate films cast from solution in high magnetic field

Cellulose triacetate solutions with various solvents, including methylene c hloride, methyl acetate, and their mixture with ethanol, were cast in high magnetic fields, and the obtained films were subjected to the optical and i nfrared measurements. The film cast from a solution with a methyl acetate/e thanol mixed solvent exhibited birefringence as well as infrared dichroism, whereas the films cast from the other solutions did not. The aligned struc ture was discussed by comparison with a mechanically stretched sample. (C) 2001 John Wiley & Sons, Inc. J Polym Sci Part B., Polym Phys 39: 1942-1947, 2001.