In this paper we present a study of photoinduced effects, including molecular relaxation in a side chain liquid crystalline polymer. In particular, we have studied relaxation phenomena using Ellipsometry and Photoinduced Birefringence in pump-probe experiments, which were carried out as a function of temperature, optical pump intensity and sample preparation and history. Two specific areas were investigated in detail: the frustration effect of the trans-cis photoisomerization transition on the nematic phase, and hence the photoinduced isothermal transition from perturbed nematic to a totally frustrated (isotropic) phase; and the approach of the glass transition, in such a fragile polymeric glass as the one we studied.
Photoinduced molecular reorientation and relaxation in a liquid crystalline polymer / S., Arisi; P., Camorani; Cristofolini, Luigi; Fontana, Marco Paolo; M., Laus. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY. SECTION A, MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1058-725X. - 372:1(2001), pp. 241-253. [10.1080/10587250127575]
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