This paper is devoted to the analysis of the photochemical behaviour of copolymers with carbazole units exposed to long-wavelength radiation. These copolymers are constituted of two types of carbazolylethyl methacrylate units (CEM) with octyl methacrylate moieties (OMA). The exposure of copolymers and PVK to UV light results in dramatic modifications of the physical and photophysical properties of the polymer. These modifications can be correlated with modifications of the chemical structure of the matrix. The photoageing of copolymers and PVK has been analysed by fluorescence, ESR, UVevis and infrared spectroscopies. The effects of crosslinking and chain scissions were determined by gel fraction measurements and size exclusion chromatography.
The research of polymer materials with advanced performance for information recording is an active branch in material science and photonics. The series of carbazole‐containing compounds: poly‐epoxypropylcarbazole (PEPC), poly‐epithiopropylcarbazole (PETPC), and copolymers of PETPC:glycidyl butyrate (PETPC:GB) were synthesized and investigated. The presented characteristics of thin films structures based on polymers mentioned above show the possibility to use them for both holographic and e‐beam recording. The interesting feature has been found concerning the formation of hidden gratings which have been revealed only by etching.
Carbazolic copolymers have been developed to be used in reversible holographic recording. This paper describes a complete analysis, from synthesis of the material to its applications, together with the corresponding characterizations. The investigated materials were photosensitive copolymers obtained from carbazolylalkylmethacrylates (CEM) and octylmethacrylate (OMA). A detailed investigation was undertaken involving infrared spectroscopy and NMR techniques,1H,13C, COSY, and HSQC, in order to establish the chemical structure and the composition of the copolymers. Holographic recording characteristics were investigated with one- and two-layer photothermoplastic carriers. The two-layer carrier contains separate photosensitive and thermoplastic layers and gives the best holographic response. The surface of microstructured samples has been characterized by atomic force microscopy analysis. It is shown that via a photothermoplastic recording process, it is possible to record and read holograms practically in real time (~3 s) with a diffraction efficiency of 10% and a spatial resolution higher than 1000 .
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