Abstract
The photoinduced birefringence in glassy layers of the new photocrosslinkingpolymers containing benzaldehyde groups in the side chain is experimentallyinvestigated. The kinetics of the birefringence recording is revealed to have anuntypical shape compared to the known photosensitive materials of the same type.Under polarized UV exposure, the negative and positive birefringence are formedconsecutively, the positive one being stable to the influence of liquids and heating (up to120 °C). A new qualitative mechanism explaining the features revealed is proposed and verified bynumerical simulation. According to the assumptions made, the positive birefringence isformed by anisotropic photocrosslinks which ensure its stability, which is of greatimportance for the practical application of the polymers under study, including liquidcrystal photoalignment.
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