1,721,006 research outputs found
Structural relaxation in the glassy state of a side chain liquid crystalline polymer: a comparison between different theoretical approaches
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On the physical parameters and relaxation processes in nematic azobenzene polymers for optical nanowriting
No full textThe possibility of achieving devices for rewritable optical storage is provided by liquid-crystalline polymers with azobenzene side groups, because they undergo photochemically induced trans-cis reversible isomerization. In this work we overview our investigations into a nematic azobenzene-polymethacrylate (PMA4) as a suitable material for optical nanowriting. Relaxation processes over different time-length scales are discussed with particular reference to understanding the interplay between homogeneity at the molecular level, bit stability and working temperature range
- "An ESR study on the heterogeneity in a nematic polyner induced by thermal annealing in the isotropic phase"
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Effects of side-chain length on rotational dynamics of cholestane spin probe in nearly monodisperse poly(alkyl acrylates) (PMA, PEA, PnBA)
No full textPhysical aging in side-chain liquid crystal polymers: A DSC investigation of the enthalpy relaxation
No full textThe enthalpy relaxation of the glasses of two side-chain liquid crystal polymethacrylates was studied with physical aging experiments detected with differential scanning calorimetry. The experimental traces were fairly well reproduced in the framework of a recent configurational entropic model. The temperature dependence of the equilibrium structural relaxation times was obtained with a simultaneous fit of several different thermograms and compared with-the behavior found for the poly(methyl methacrylate) (PMMA). The comparison evidenced the stronger character of the two liquid crystal polymers, in the frame of the strong/fragile classification of glass-forming systems. At variance with the prediction of the energy landscape model, the heat capacity increment at the glass transition was greater than in PMMA, confirming some recent results on polymeric glass formers
Optical bit stability and relaxation processes in a liquid crystal polymer with a photosensitive azo dye molecule as side group
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