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Bulunan: 37 Adet 0.081 sn

Dergi Adı : Turkish Journal of C ... ✕

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Yazar [67]

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Erişime Açık

Redox polymerization of N-isopropylacrylamide by using hydroxylated soya oil polymer

Allı, Abdulkadir | Şanal, Timur | Hazer, Baki

Abstract: Water soluble hydroxylated soya oil polymer was used in the redox polymerization of N-isopropylacrylamide (NIPAM) in order to obtain water-based hydroxylated-soya oil polymer-g-PNIPAM graft copolymer. For this purpose, soya oil was exposed to air under sunlight to obtain autoxidized soya oil polymer (PSy-ox). PSy-ox was allowed to react with diethanol amine to obtain hydroxylated soya oil polymer (hydroxylated-PSy). An ammonium persulfate with hydroxylated-PSy redox initiating system was used in the polymerization of NIPAM in order to obtain thermo-responsive hydroxylated-PSy-g-PNIPA ...Daha fazlası

Makale 2015 Turkish Journal of Chemistry39 ( 2 ) , pp. 3 - 394 830 Görüntülenme

Erişime Açık

Production of bacterial polyesters from some various new substrates by Alcaligenes eutrophus and Pseudomonas oleovorans

Koçer, Halil | Borcaklı, Mehlika | Demirel, Songün | Hazer, Baki

Poly(3-hydroxy alkanoate)s (PHA)s are bacterial polyesters that have, due to their biodegradability and biocompatibility, attracted considerable industrial interest. All the substrates used in feeding Alcaligenes eutrophus and Pseudomonas oleovorans have been reviewed as far as we know, and some more new substrates or mixtures have been used in PHA production by microorganisms. Alcaligenes eutrophus was fed with 4-pentenoic acid, 2-hydroxy ethyl methacrylate (HEMA), corn oil acids, linseed oil acids and limonene as well as mixtures of acetic acid and glucose or lactose. Either HEMA as a sole c ...Daha fazlası

Makale 2003 Turkish Journal of Chemistry27 ( 3 ) , pp. 3 - 373 750 Görüntülenme

Comparison of photochromic properties and thermal stabilities of fulgide, fulgimide, and benzimidazole[1,2-a]pyrrolidine-2-one derivatives

Köse M. | Orhan E.

New thermally stable photochromic fulgimides and benzimidazole[1,2-a]pyrrolidin-2-one derivatives of furylfulgide and thienylfulgide were prepared and their photochromic properties were investigated. Thermal stabilities of some of the new isomers in an alcoholic solution and in PMMA (poly(methyl methacrylate)) polymer films, and pyrolytic behaviors in inert atmosphere with TGA were compared. The colored form of fulgimide and that of benzimidazole[1,2-a]pyrrolidin-2-one derivatives showed large bathochromic shifts for visible absorption maximum compared with the colored form of corresponding fu ...Daha fazlası

Makale 2009 Turkish Journal of Chemistry33 ( 5 ) , pp. 5 - 588 245 Görüntülenme

Determination of linear alkylbenzene sulphonates and their biodegradation intermediates by isocratic RP-HPLC

Akyüz M. | Roberts D.J.

An HPLC method was developed to determine linear alkylbenzene sulphonates (LASs) and their bio-transformation products sulphophenyl carboxylates by isocratic chromatography using two C18 columns in series. Solid-phase extraction with a (C18) cartridge was employed to isolate LAS from sediment and sewage effluent samples. Sodium perchlorate and ammonium perchlorate were used as ion pair agents. The recovery of the compounds was 94% ± 2 and 98% ± 2 respectively for sediment and sewage effluent. It was demonstrated that it is possible to separate LAS compounds and their isomers and homologues usi ...Daha fazlası

Makale 2002 Turkish Journal of Chemistry26 ( 5 ) , pp. 6 - 679 414 Görüntülenme

Base hydrolysis kinetics of cobalt(III) spiro-octaamine dimer

Baran Y. | Lawrance G.

The preparation and characterisation of a cobalt (III) complex of octaaza ligand, 5, 5'-bis(4-amino-2-azabutyl)-1,9-diamino-3,7-diazanonane (octaam) is described. The base hydrolysis kinetics of bis cobalt(III) of octaam has been studied spectrophotometrically by the stopped-flow technique. A consequent reaction is observed in the base hydrolysis of the spiro-octaamine with the fast reaction having kOH = 3.55 M-1s-1 and the slower reaction kOH = 0.72 M-1s-1 at 298 K with ?H# = 89 kJ/mol for the fast stage and ?H# = 102 kJ/mol for the slow stage (I = 0.4 M NaClO4). The fast reaction is assigned ...Daha fazlası

Makale 2002 Turkish Journal of Chemistry26 ( 5 ) , pp. 7 - 776 210 Görüntülenme

The synthesis of 2-(chloromethyl)-6-hydroxy-2H-pyran-3 (6H)-one via Achmatowicz rearrangement

Gerçek, Zuhal

Achmatowicz rearrangement was carried out with 2-chloro-1-(furan-2-yl) ethanol, which was synthesized starting from 1-(furan-2-yl) ethanone. It was shown that the oxidation of 2-chloro-1-(furan-2-yl)ethanol with m-CPBA produced 2-(chloromethyl)-6-hydroxy-2H-pyran-3 (6H)-one in good yield (70%). Achmatowicz rearrangement was carried out with 2-chloro-1-(furan-2-yl) ethanol, which was synthesized starting from 1-(furan-2-yl) ethanone. It was shown that the oxidation of 2-chloro-1-(furan-2-yl)ethanol with m-CPBA produced 2-(chloromethyl)-6-hydroxy-2H-pyran-3 (6H)-one in good yield (70%).

Makale 2007 Turkish Journal of Chemistry31 ( 4 ) , pp. 4 - 494 303 Görüntülenme

Radio frequency-induced plasma polymerization of allyl alcohol and 1-propanol

Candan, Şennur

http://www.trdizin.gov.tr/publication/paper/detail/TXpJMU1qSXk= https://hdl.handle.net/20.500.12628/1681

Makale 2002 Turkish Journal of Chemistry26 ( 5 ) , pp. 7 - 791 358 Görüntülenme

An atropisomeric chiral 2,2'-bipyridyl-3,3'-dicarboxylic acid and corresponding platinum (II) complex

Şengül, Abdurrahman

2,2'-Bipyridyl-3,3'-dicarboxylic acid $(H_2BDC)$ spontaneously resolves on crystallization from water, giving monohydrated crystals of the space group $P2_12_12_1$. In any individual crystal, all the atropisomeric-skewed molecules are of one hand; however, on dissolution in water, optical activity is lost. Strong hydrogen bonding leads to a helical structure, via O-H...N links, and 3 further strong bonds between water and carboxylate groups produce a framework structure. The $pK_a$ values measured for $H_2BDC$ (3.18 ± 0.04 and 4.59 ± 0.02 at 20 ± 1 °C, in dilute aqueous solution) agree wit ...Daha fazlası

Makale 2004 Turkish Journal of Chemistry28 ( 6 ) , pp. 7 - 713 310 Görüntülenme

Thermogravimetric characterization of Turkish bituminous coals for combustion

Kızgut, Sait | Çuhadaroğlu, Dilek | Toroğlu, İhsan

This study focused on the thermal gravimetric characterization of Turkish bituminous coals for combustion. The combustion properties considered were based on the burning profile of coal samples and their chars produced in a PL 1500 TGA apparatus. The coal seam samples used in the study were obtained from TTK (Turkish Hardcoal Enterprise) mines as channel samples. The majority of the samples from 12 seams were medium-volatile bituminous and only three of them were high-volatile bituminous. Combustion profile parameters of coal samples and chars were correlated with petrographic, proximate and u ...Daha fazlası