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Aggregation-induced emission enhancement of optically active copolymers

100%
Galica M., Bogdał D.
Czasopismo Techniczne
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-
PL
The absorption and photoluminescence spectra of the polymer in DMF-H2O systems were analyzed. Finally, it was determined to enhance the ability of AIEE effect for CEM-5MK solutions. In results, study confirmed the usefulness of the copolymers CEM / MK as materials for optoelectronic applications.
2
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THE USE OF HYALURONIC ACID IN THE TREATMENT OF OSTEOARTHRITIS OF KNEE CARTILAGE

100%
Kwasek B., Bogdał D.
Czasopismo Techniczne
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-
PL
The aim of this paper is to describe the possibilities of the therapeutic use of hyaluronic acid (HA) in the treatment of osteoarthritis of knee cartilage. This work provides an overview of the literature relating to the structure of hyaluronic acid, its properties and important functions of the human body. Moreover, the construction of the articular cartilage in the knee joint, including events leading to its degeneration, is presented. Viscosupplementation is a treatment for osteoarthritis involving several intra-articular injections of HA at specific time intervals. This treatment results in an increased lubricity, viscosity and elasticity of articular cartilage. Since HA is found naturally in the human body, viscosupplementation improves the biomechanical conditions of the joint whilst minimizing the side-effects of treatment. Hyaluronic acid occurs naturally in a linear form, but for many applications, chemical modifications are necessary. Thanks to this property, it remains in the body long enough to produce the desired therapeutic effect. Modification processes, in particular the cross-linking of HA, increase the mechanical properties of knee cartilage. HA is an example of a new kind of tissue engineering scaffold that is bioactive in both full-length and degraded forms. In turn, hydrogel scaffolds with interpenetrating polymeric network (IPN) gels can simulate the structure of the native extracellular matrix of cartilage tissue.
3
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Application of Na12[WZn3(H2O)2][ZnW9O34)2] polyoxometalate as a catalyst in oxidation of alcohols under microwave irradiation

81%
Kasprzyk W., Galica M., Bednarz S., Bogdał D.
Czasopismo Techniczne
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PL
In this paper the results of oxidation of alcohols under microwave irradiation using Na12[WZn3(H2O)2][ZnW9O32)2] (ZnPOM) as a catalyst was shown. These reactions were conducted in microwave high-pressure reactor using acetonitryl as organic solvent and 30% hydrogen peroxide as oxidant. Under reaction conditions primary alcohols were oxidized to appropriate acids, secondary alcohols were oxidized to ketones. In case of diols it was found that secondary –OH groups were oxidized in the first instance.
4
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Application of a carbazole derivative as a spectroscopic fluorescent probe for real time monitoring of cationic photopolymerization

81%
Ortyl J., Galica M., Popielarz R., Bogdał D.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 1
75-80
EN
The performance of 1-(9-ethylcarbazol-3-yl)-4,4,4-trifluorobutane-1,3-dione (1) as a fluorescent probe for the monitoring of cationic photopolymerization processes by Fluorescence Probe Technique (FPT) has been evaluated in comparison with the response of 7-diethylamino-4-methylcoumarin (Coumarin 1) (2). Triethylene glycol divinyl ether and diphenyliodonium hexafluorophosphate were used as an example monomer and a cationic photoinitiator respectively. It has been found that the probe 1 withstands the cationic polymerization conditions and provides correct probe response. 1-(9-ethylcarbazol-3-yl)-4,4,4-trifluorobutane-1,3-dione shifts its fluorescence spectrum with progress of cationic photopolymerization of the monomer, which enables the monitoring of the polymerization progress using the fluorescence intensity ratio measured at two different wavelengths as the progress indicator. By comparing the behavior of 1 and 2, it has been documented that the fluorescence spectrum of probe 1 shows a spectacular hypsochromic shift (Δλ = 33 nm) upon the monomer polymerization, while the shift of 2 is three times smaller (Δλ = 11 nm). Moreover, the sensitivity of probe 1 is more than 2.5-times higher than that of any other probes suitable for monitoring cationic polymerization processes, reported previously. Therefore, application of the carbazole derivative (1) as a new probe for the monitoring of the crosslinking process of coatings cured by cationic photopolymerization has been proposed.
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