Lyotropic Behavior of Poly(2,5-dinonyloxy-p-phenylenevinylene)

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Abstract
It has been revealed that a concentrated chloroform solution of poly(2,5-dinonyloxy- p-phenylenevinylene) (NO-PPV) can be in a lyotropic liquid crystalline state at room temperature. The lyotropic NO-PPV solution exhibits redshift of optical absorption compared with the isotropic solution. X-ray diffraction analysis of an NO-PPV film cast from the chloroform solution suggested that a so-called sanidic (boardlike) mesophase formed in the solution state: i.e. the polymer main chains are extended, aligned side-by-side, and stacked parallel to each other. Preparation of fibers and films with preferred orientation from the NO-PPV solution was also described.