Abstract
Influence of the molecular weight on the thermally enhanced photoinduced molecular reorientation of photo-cross-linkable liquid crystalline polymer films was investigated, where axis-selectively photoreacted side groups controlled the reorientation. Sufficient molecular reorientation (S>0.7) was achieved when the number-average molecular weight (Mn) was >1.8 × 104, but reorientation ability was inferior when Mn was less than 1.0 × 104. The efficiency of the molecular reorientation depended on both degree of the photoreaction and the molecular weight of the material, which is related to the insolubility of the photoreacted film.
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