| 摘要 |
A process is disclosed for the production of biaxially oriented liquid crystal films. The process comprises: (i) forming an anisotropic dope from a polymerization solution of rigid rod heterocyclic liquid crystalline polymers such as poly(¢benzo(1,2-d:4,5-d')bisthiazole-2,6-diyl! 1,4 phenylene), its cis isomer or mixtures thereof, and poly(¢benzo(1,2-d:4,5-d')bisoxazole-2,6-diyl! 1,4-phenylene), its cis isomer or mixtures thereof, and a solvent such as polyphosphoric acid; (ii) extruding the dope to form a film; (iii) imparting biaxial orientation to the film to increase the transverse strength thereof; (iv) solidifying the biaxially oriented film; and (v) washing the solidified film to remove the solvent. Also disclosed is a liquid crystal film produced by the above process. 0
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