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The influence of annealing on the molecular orientation of rubbed polyimide film was investigated using reflection ellipsometry. A marked decrease in the in-plane anisotropy of polyimide film was observed when annealing above 130° C. Detailed analysis proved that the decrease in anisotropy was due to the change in the molecular orientation direction in the temperature range of 130–230° C. Annealing at 280° C not only changed the direction of orientation but also the disordering of polyimide orientation.
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Hirosawa et al. (1997) studied this question.
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