К числу важных материалов для новых технологий, безусловно, относятся органические люминесцентные материалы, которые широко используются в связи с прогрессом искусственного освещения, дисплеев, разработкой флуоресцентных биомедицинских инструментов, люминесцентной дефектоскопии и для многих специальных целей.

The luminescent properties of an organic dyad that combines two different luminophores, hydroxy-substituted 2,4,5-triarylimidazole and 8-azomethine-7-hydroxycoumarin, in its molecule have been studied in seventeen polymer matrices obtained by photocuring, which are represented by linear poly(meth)acrylates differing in the amount of hydroxyl groups and acrylic network polymers differing in the nature of crosslinking oligomeric blocks. The dependence of the luminescent properties of materials on the wavelength of excitation light, as well as on the presence and amount of hydroxyl groups in polymers; the presence of urethane groups, ether bonds, and aromatic moieties (individually or in combination); and flexibility and conditional polarity of the matrix, has been established.

The conditions to prepare luminescent acrylate polymers containing the organic dyad, molecule of which combines two different emitting fragments, hydroxyl-substituted 2,4,5–triarylimidazole and 8-azomethine-7-hydroxycoumarine moieties, via photocuring have been optimized. The effect of the nature of the photocured network acrylate polymers on luminescent properties of the dyad has been investigated. The prepared aliphatic network polymers have exhibited independent fluorescence of both molecule fragments, dependent on the excitation wavelength. At the same time, the aromatic network polymers and the aliphatic network polymers containing ether links have revealed only the imidazole fragment fluorescence. The fluorescence nature has been stronger dependent on the polymer repeat unit structure and the content of the aromatic fragments in the polymer matrix than on the presence of the hydroxyl groups in the polymer. It has been shown that the emission of the imidazole fragment of the dyad in the aliphatic network polymers depends on the internode distance and conditional polarity of the medium.

The influence of the nature of linear acrylic polymers differing in the concentration of hydroxyl groups on the spectral-luminescent properties of a hybrid compound, the molecule of which combines two different luminophore fragments, namely, hydroxy-substituted 2,4,5-triarylimidazole and 8-azomethine-7-hydroxycoumarin, and model compounds corresponding to these fragments, is studied. The optimum conditions for the preparation of acrylic polymers containing the luminophores under study by photocuring are selected. The dependence of the luminescent properties of the materials on the number of hydroxyl groups is established.

Abstract Polymerizable (meth)acrylate groups were introduced into polylactide (PLA) in the methylene chloride or toluene medium. Polymer modification was carried out both on the carboxyl and hydroxyl groups of polylactide. The efficiency of this modification was studied depending on the type of reaction. It was found that the highest degree of polylactide modification by (meth)acrylate groups (86%) is achieved through the formation of PLA urethane derivatives in the presence of diisocyanates. Samples of photocured, three-dimensionally crosslinked after such a modification polylactides were obtained, their biocompatibility was determined. It was shown that such materials are promising for use in regenerative medicine and tissue engineering.

The possibilities of creating a monolithic lenticular lens with an increased focal length capable of forming a view zone of an autostereoscopic image at a distance of at least 3–7 m away from the screen, are studied. At the optimal ratio between the refractometric, viscosity, and chemical parameters of liquid composition, the use of polymerizable photocurable acrylic compositions based on oligourethane acrylates as the immersion medium gives rise to an immersion-formed polymer with optical parameters ensuring the desired focal length of a monolithic lenticular lens.

One-stage modification of polylactide has been performed to obtain the acrylate derivatives of the polymer capable of further polymerization and preparation of cross-linked polymer materials suitable for creating implants. The reaction mechanism was determined by IR spectroscopy, gel permeation chromatography, and differential thermal analysis. It was shown for the first time that the reaction path changes depending on the ratio of components so that the desired product polylactide acrylate forms with a ~90% yield only in the presence of large (approximately tenfold) excesses of the isocyanate and acrylate components; at the equimolar ratio of components generally used in urethane formation, a mixture of the desired product (~30%), oligourethane diacrylates, and unchanged polylactide forms.

It is shown that the activity of the water-soluble porphyrin photosensitizer dimegine (DMG) in the oxidation reaction of tryptophan, a test reaction for photodynamic therapy (PDT), can be enhanced by introducing silver, gold, and hydroxyapatite nanoparticles (NP) into the reaction medium if an amphiphilic polymer (AP) with the properties of a SAS is introduced into this mixture. It is concluded that the effect of enhancing the photosensitizing activity of dimegine is due to the formation of nanoparticle-Pluronic-porphyrin triple systems in which Pluronic (PL) plays the role of a bridge, forming complex and adsorption bonds with porphyrin and nanoparticles.

Изучено влияние параметров сетки пространственно сшитых полиакриловых оптически прозрачных матриц на процесс генерирования поверхностного плазмонного резонанса наночастиц золота, образующихся при облучении раствора соли золота Au3+ в жидкой акриловой композиции. При УФ-облучении раствора одновременно происходит фотовосстановление золота и фотоинициированная полимеризация акрилатов с образованием прозрачных бесцветных пленок, в которых при последующем воздействии света и(или) тепла генерируется полоса поглощения вблизи 550 нм, обусловленная плазмонным резонансом наноразмерных частиц металла. В процессе фотовосстановления соли золота в матрице олигоуретанакрилатных композиций с близким строением олигомерного блока параметры пространственной сетки – межузловое и межцепное расстояния – влияют на скорость генерирования наночастиц золота, но не на предельное значение оптической плотности полосы плазмонного резонанса наночастиц. Полиакрилатные матрицы могут являться регистрирующей средой для оптической записи информации.

The effect of network parameters of three-dimensionally crosslinked polyacrylic optically transparent matrices on the generation of surface plasmon resonance of gold nanoparticles forming during irradiation of Au3+ salt solutions in a liquid acrylic composite is studied. During the UV irradiation of a solution, the photoreduction of gold and the photoinitiated polymerization of acrylates proceed simultaneously to form transparent colorless films in which, after subsequent light and/or heat treatment, an absorption band near 550 nm that corresponds to the plasmon resonance of nanosize metal particles is generated. During the photoreduction of gold salt in matrices of oligo(urethane acrylate) composites with similar structures of the oligomeric block, the parameters of the three-dimensional network—the internodal and interchain distances—affect the rate of generation of gold nanoparticles but not the limiting value of optical density for the plasmon-resonance band of nanoparticles. Polyacrylate matrices may serve as a registering medium for optical data recording.

The effect of the network density of spatially crosslinked polyacrylic transparent matrices and the conditions of their impregnation with a photochromic compound via the use of supercritical carbon dioxide on the concentration of the introduced photochromic compound of the spiroxazin family is studied. The concentration of impregnated filler in a matrix is shown to increase with increases in the interjunction distance (below a certain level) and network chain flexibility as well as with increases in the temperature and pressure of the impregnation process. Impregnation in rigid networks occurs only in surface layers, whereas, in an elastic network, impregnation occurs in the entire volume of a sample. Matrices based on oligourethanemethacrylates are characterized by a good thermodynamic affinity toward spiroxazin photochromic compounds, a fact that makes it possible to increase the concentration of photochromic compounds in the matrix up to 3 wt % under conditions of supercritical impregnation. The photochromic characteristics of an impregnated compound are shown to be preserved in samples.

The possibility of generation of a surface plasmon resonance by gold nanoparticles in a 3D network polymer matrix upon irradiation of a liquid acrylic composition containing a dissolved Au3+ salt is demonstrated for the first time. UV-irradiation of the solution simultaneously causes gold photoreduction to Au0 and acrylate photopolymerization. The possibility of preparing transparent colorless films that, when heated or exposed to light, give rise to a visible-spectrum absorption band belonging to a plasmon resonance of metal nanoparticles is demonstrated. The intensity and position of the plasmon resonance band depend on the parameters of the 3D polymer network, chemical structure of the oligomer, type of the support, and conditions of formation of Au0 particles. The formation of reduced gold nanoparticles responsible for the plasmon resonance band occurs more effectively in low-density networks with a large interchain length and containing oligomer block capable of complexation with the metal. The formation of nanoparticles is affected by the chlorine-containing products of the reduction of the gold salt.