The synthesis and properties of<i>N</i>-(2,3-epoxypropyl)carbazoles and the oligomers based on them

Ахмедов, Х. М.; Каримов, Х. С.; Shcherbakova, I. M.; Porshnev, Yu. N.; Cherkashin, Μ. I.

doi:10.1070/rc1990v059n05abeh003534

Cited by 18 publications

(8 citation statements)

References 2 publications

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“…Eckl et al reported that the T g of polymethacrylates increased from about 100 to 190°C by introducing bulky adamant substitutes onto the side chains 20 . N ‐(2,3‐epoxylpropyl)carbazole is a well known commercial monomer, which can be used for the preparation of photoconductive polymer 21–23. The resulted polymer has relatively high T g and thermal stabilities due to the presence of bulky and rigid carbazyl side groups 24.…”

Section: Introductionmentioning

confidence: 99%

Thermally stable aliphatic polycarbonate containing bulky carbazole pendants

Gao

Xiao

et al. 2008

J of Applied Polymer Sci

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To improve the thermal and mechanical properties of poly(propylene carbonate) (PPC), the terpolymers were synthesized by the terpolymerization of CO 2 with PO and a third monomer, N-(2,3-epoxylpropyl)carbazole (NEC) using supported zinc glutarate as catalyst. The catalytic activity, molecular weight, carbonate unit content, as well as the thermal and mechanical properties were investigated extensively. The experimental results showed that the catalytic activity, molecular weight, and carbonate unit content decreased with the incorporation of NEC. The introduction of NEC increased the glass transition temperature from 38.0 to 44.18C. Moreover, the thermal decomposition temperature (T g-5% ) of the terpolymer (2788C) was much higher than that of pure PPC (2388C). Accordingly, the mechanical properties proved to be enhanced greatly as evidenced by tensile tests due to the incorporation of bulky carbazole moieties. These improvements in thermal and mechanical properties are of very importance for the process of PPC.

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Section: Introductionmentioning

confidence: 99%

Thermally stable aliphatic polycarbonate containing bulky carbazole pendants

Gao

Xiao

et al. 2008

J of Applied Polymer Sci

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“…Commercially available Cu 2 O microparticles, having a diameter in the range of 3–4 μm, were purchased from WINLAB UK (Leicestershire, UK), whereas nickel phthalocyanine powder was purchased from Sigma Aldrich (Lahore, Pakistan), and was used without further purification. PEPC however was synthesized in the laboratory, and its fabrication process has been described in detail elsewhere [17]. Figures 1(a,b) show the molecular structures of nickel phthalocyanine and PEPC.…”

Section: Methodsmentioning

confidence: 99%

A Humidity Sensing Organic-Inorganic Composite for Environmental Monitoring

Ahmad

Zafar

Sulaiman

et al. 2013

Sensors

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In this paper, we present the effect of varying humidity levels on the electrical parameters and the multi frequency response of the electrical parameters of an organic-inorganic composite (PEPC+NiPc+Cu2O)-based humidity sensor. Silver thin films (thickness ∼200 nm) were primarily deposited on plasma cleaned glass substrates by the physical vapor deposition (PVD) technique. A pair of rectangular silver electrodes was formed by patterning silver film through standard optical lithography technique. An active layer of organic-inorganic composite for humidity sensing was later spun coated to cover the separation between the silver electrodes. The electrical characterization of the sensor was performed as a function of relative humidity levels and frequency of the AC input signal. The sensor showed reversible changes in its capacitance with variations in humidity level. The maximum sensitivity ∼31.6 pF/%RH at 100 Hz in capacitive mode of operation has been attained. The aim of this study was to increase the sensitivity of the previously reported humidity sensors using PEPC and NiPc, which has been successfully achieved.

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“…The synthesis of epoxypropylcarbazoles (Akhmedov et al, 1990) and electrochemistry of carbazolylalkyl-substituted polysiloxanes (Maud et al, 1994) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Polymerisation of methyl ethyl ketone formaldehyde resin modified with carbazole‐9‐carbonyl chloride

Ustamehmetoğlu

Yazıcı²,

Kızılcan

2011

Pigment & Resin Technology

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Purpose -The purpose of this paper is to obtain a conductive polymer by using a fluorescence comonomer which is an insulator. In this study, methyl ethyl ketone formaldehyde resin (MEKFR) modified with carbazole-9-carbonyl chloride (CzCl) was synthesised via hydroxyl groups of MEKFR. Electrochemical polymerisation of Cz-MEKFR comonomer was carried out potentiostatically and a green, conductive polymer P(Cz-MEKFR) was obtained. The advantages of obtaining alternative structure of P(Cz-MEKFR) to the random copolymer were reported. Design/methodology/approach -Cz-MEKFR comonomer was synthesised by the esterification reaction of CzCl and hydroxyl groups of MEKFR. Then, for the electrochemical polymerisation, potentiodynamic electrodeposition of Cz-MEKFR comonomer in dichloromethane on to Pt was carried out. Electrochemical activities of polymers were tested by electrochemical methods (i.e. polarization curves and cyclovoltammetry). UV-visible, NMR, polarization curves, cyclovoltammetric, solid-state conductivity measurements and in situ spectroelectrochemical methods were performed for the characterization of polymers. Findings -Carbazole-9-carbonyl chloride(CzCl) modified MEKFR was synthesised. This new carbazole-modified resin (Cz-MEKFR comonomer) has fluorescence property. The ionization potentials (Ip), electron affinity (Ea), optical band gap (Eg), peak potentials (Ep) and doping degree (y) of the polymers were calculated. Results were compared with the PCz homopolymer and the copolymer obtained from the mixture of MEKFR with carbazole P(Cz-co-MEKFR).Research limitations/implications -This study focuses on obtaining a conductive polymer by using a fluorescence comonomer which is an insulator. In order to remove pyridine from comonomer, successively washing with several portions of dilute aqueous H 2 SO 4 , water-saturated aqueous sodium hydrogen carbonate, and hot water is necessary. Practical implications -This work provides technical information for the synthesis of fluorescence comonomer and conducting an alternative polymer. Originality/value -A new Cz-CFR comonomer was synthesised. This comonomer has a higher T m value than MEKFR alone and also has fluorescence property. The band gap of the copolymer is not remarkably lower than polycarbazole. The oxidation potential of P(Cz-MEKFR) was found to be higher than the PCz homopolymer and the solubility of copolymer is 30 per cent higher than homopolymer.

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The synthesis and properties ofN-(2,3-epoxypropyl)carbazoles and the oligomers based on them

Cited by 18 publications

References 2 publications

Thermally stable aliphatic polycarbonate containing bulky carbazole pendants

Thermally stable aliphatic polycarbonate containing bulky carbazole pendants

A Humidity Sensing Organic-Inorganic Composite for Environmental Monitoring

Polymerisation of methyl ethyl ketone formaldehyde resin modified with carbazole‐9‐carbonyl chloride

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