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Wyszukujesz frazę "carbazole" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Application of a carbazole derivative as a spectroscopic fluorescent probe for real time monitoring of cationic photopolymerization
    Autorzy:
    Ortyl, J.
    Galica, M.
    Popielarz, R.
    Bogdał, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/778445.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    spectroscopic fluorescent probe
    FPT
    fluorescence
    carbazole
    photopolymerization
    Opis:
    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.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 1; 75-80
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multifunctional oligoetherols and polyurethane foams with carbazole ring
    Autorzy:
    Lubczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778805.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    carbazole
    sorbitol
    hydroxyalkylation
    oligoetherols
    thermal stability of foams
    Opis:
    A new method of preparation of multifunctional oligoetherols containing carbazole ring is presented. The oligoetherols were obtained in the reaction of 9-(2,3-epoxypropyl)carbazole with sorbitol and oxiranes like ethylene and propylene oxide. The structure of obtained oligoetherols was determined by IR, H-NMR and MALDI-ToF spectroscopies. Physical properties of the products render them good candidates for preparing polyurethane foams. The foams were obtained and their properties were examined. It has been found that the foams are rigid at room temperature and their apparent density was 50–70 kg/m3. The water uptake was low, maximum to 6.5 mass%. Obtained foams have high thermal resistance. Dynamic thermal analysis of these foams showed that 5% mass loss was initiated at 250–300oC, while temperature of 50% mass loss was 370–404oC. Concomitantly the increase of compression strength was observed.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 1; 120-126
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Syntezy oliwacyny
    Synthesis of olivacine
    Autorzy:
    Tylińska, B.
    Redzicka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172661.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    synteza
    oliwacyna
    pirydo[4,3-b]karbazol
    synthesis
    olivacine
    pyrido[4,3-b]carbazole
    Opis:
    Olivacine (1,5-methyl-6H-pyrido[4,3-b]carbazole) is an isomer of ellipticine (5,11-dimethyl-6H-pyrido[4,3-b] carbazole). Both of these heterocyclic compounds are carbazole derivatives, which exhibit broad spectrum of biological activity [1], especially as antineoplastic agents [2–9]. These four-ring heterocycles can be isolated from natural sources [10–16], or prepared synthetically. Chemical literature described more than 20 method of synthesis of olivacine [2, 17–34]. In this paper we described five selected syntheses of this alkaloid. In the first one this compound can be obtained during a multistep synthesis starting from 1-benzenesulfonyl-2-lithioindole [35]. A shorter method to get olivacine was the condensation of indole with an ethylene ketal [35]. Third synthesis starts from obtaining benzenosulfonyloindol from indole [37]. Another way starts from the synthesis of 1-(tert-butoxy)carbonyloindol [38]. Fifth method to get olivacine is the synthesis from the 1H-indole -2-carboxylate [39].
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 11-12; 983-995
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Nanomaterials on Thermal Stability of 1,3,6,8-Tetranitro Carbazole
    Autorzy:
    Pourmortazavi, S. M.
    Rahimi-Nasrabadi, M.
    Rai, H.
    Jabbarzadeh, Y.
    Javidan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/358744.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    thermal stability
    nanomaterial effect
    decomposition kinetics
    1,3,6,8-tetranitro carbazole
    energetic material
    Opis:
    1,3,6,8-tetranitro carbazole (TNC) as a secondary explosive is used in composite explosive formulations in order to reduce the sensitivity and increase the stability of the explosive composites. In this work, the thermal stabilities of pure TNC and its nanocomposites prepared via three different nanoparticles were studied by thermal analysis, i.e. differential scanning calorimetery (DSC) and thermogravimetry (TG) techniques. Thermal analysis data revealed that the thermal behavior of pure TNC is significantly different from the nanocomposites studied. Pure TNC decomposed completely during a single step in the temperature range 385-425 °C. However, the addition of nanoparticles to the TNC powder leads to higher thermal stability in comparison with the pure TNC. The decomposition kinetics of TNC and its nanocomposites were studied by non-isothermal DSC at several heating rates. Thermokinetic and thermodynamic parameters corresponding to the thermal decomposition of pure TNC and nanocomposites were computed and compared. The results showed that the addition of nanoparticles to the TNC powder has a considerable effect on the thermal stability of the explosive.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 201-216
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemia i katalizatory procesu głębokiego hydroodsiarczania
    Chemistry and catalysts of deep hydrodesulfurization process
    Autorzy:
    Lewandowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1835486.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Nafty i Gazu - Państwowy Instytut Badawczy
    Tematy:
    hydroodsiarczanie (HDS)
    hydrorafinacja
    reaktywność związków siarki
    karbazol
    dibenzotiofen
    DBT
    4,6-dimetylodibenzotiofen (4,6-DMDBT)
    hydrodesulfurization (HDS)
    hydrotreating
    reactivity of sulphur compounds
    carbazole
    dibenzothiophene (DBT)
    4,6-dimethyldibenzothiophene (4,6-DMDBT)
    Opis:
    W artykule przedstawiono zagadnienia związane ze zrozumieniem mechanizmu katalitycznego procesu głębokiego hydroodsiarczania (HDS). Omówiono rodzaje związków siarki występujących w surowcach naftowych oraz ich reaktywność w aspekcie drugiego stopnia hydrorafinacji. Opisano typy katalizatorów procesu HDS oraz przedstawiono zagadnienia związane z wykorzystaniem nowych katalizatorów (nie siarczkowych) mających potencjalne zastosowanie w drugim (głębokim) stopniu hydrorafinacji.
    The paper presents issues related to the understanding of the catalytic mechanism of the deep hydrodesulphurization process (HDS). The types of sulfur compounds present in petroleum products and their reactivity in terms of the second degree of hydrotreatment are discussed. The types of catalysts for the HDS process were described and the issues related to the use of new (non-sulfide) catalysts which have potential application in the second (deep) hydrotreatment are presented.
    Źródło:
    Nafta-Gaz; 2017, 73, 9; 685-690
    0867-8871
    Pojawia się w:
    Nafta-Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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