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Abstract
The ethyl-acetyl cellulose/dichloroacetic acid anisotropic solution film could form pseudoisotropic and oily streak textures in nature and the layers of ordered polymer chains tend to being parallel to the glass slide in the former texture and perpendicular to it in the latter one. Under the effect of the magnetic field, of which the intensity was smaller than the critical value, the changes of mesophase texture were obvious when the direction of the magnetic field (B) was parallel to the plane on which the helicoids lay but small when the B was normal to that. In the former case, the axial direction of helicoids (A) was more agreement with each other and the degree of anisotropy was higher than that without the effect of the magnetic field. But when the magnetic field was removed, the degree of anisotropy decreased gradually. The arrangement of the helicoids which were composed of the layers of ordered polymer chains played a very important role in the changes of mesophase texture.