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Synthesis of a novel macromonomer initiator for atom transfer radical polymerization: Self condensing and graft copolymerization

Allı, Abdulkadir | Hazer, Baki

A new macromonomer initiator for atom transfer radical polymerization (ATRP-MIM) based on polyethylene glycol (Mn= 660 Da) (PEG) was synthesized by the reaction of hydroxyl end of the mono-methacryloyl polyethylene glycol with 2-bromopropanoyl chloride leading to methacryloyl polyethylene glycol 2-bromopropanoyl ester (v-PEG-Br). Poly(ethylene glycol) functionalized with methacrylate at one end was reacted with 2-bromopropionyl chloride to form a macromonomeric initiator for ATRP. Self condensing ATRP-MIM polymerization yielded branched PEG with low cross-linked fraction (3-29 wt%). In the sam ...Daha fazlası

Makale 2009 Hacettepe Journal of Biology and Chemistry37 ( 1 ) , pp. 2 - 31 470 Görüntülenme
Erişime Açık

Synthesis and characterization of the poly(ethylene glycol) grafted unsaturated microbial polyesters

Kılıçay, Ebru | Hazer, Baki | Çoban, Burak | Scholz, Carmen

Pseudomonas oleovorans was grown with either 10-undecenoic acid alone or the equimolar mixture of octanoic acid and 10-undecenoic acid to obtain unsaturated poly(3- hydroxy alkanoates) (PHA)s; poly(3-hydroxy-10-undecenoate) (PHU) and poly(3-hydroxyoctanoate- co-3-hydroxy-10-undecenoate) (PHOU), respectively. The addition of bromine to olefinic double bond, by reacting the unsaturated PHA with bromine in homogeneous solution in dark, was readily carried out. The brominated PHA was reacted with polyethylene glycol (PEG) in the presence of a base to obtain PHA-g-PEG graft copolymers. The polymers ...Daha fazlası

Makale 2010 Hacettepe Journal of Biology and Chemistry38 ( 1 ) , pp. 9 - 17 541 Görüntülenme
Erişime Açık

Reactions of anionic living polymers with bromomethyl-functionalized benzoyl peroxides

Hazer, Baki | Hirao, Akira | Volga, Cüneyt

In order to synthesize benzoyl peroxide functionalized polystyrene (PSt), polyisoprene (PI) and poly(methyl methacrylate) (PMMA), anionic living PSt, PI, and PMMA were allowed to react with an excess amount of 4-(bromomethyl)benzoyl tert-butyl peroxide (BMtB) or bis[3,5-bis(bromomethyl)benzoyl] peroxide (BDBP) in tetrahydrofuran (THF) at -78°C. The results indicate that coupling reactions leading to dimers are significant during the reaction. Dimer formation was avoided when the living polystyrene was modified to the alcoholate anion by reaction with ethylene oxide (EO). © Wiley-VCH Verlag Gmb ...Daha fazlası

Makale 1999 Macromolecular Chemistry and Physics200 ( 1 ) , pp. 7 - 76 493 Görüntülenme
Erişime Açık

Molybdenum tetracarbonyl complexes with linear chain polyether-containing Schiff base ligands and their reactivity in the polymerization of methyl methacrylate

Menteş, Ayger | Sarbay, Mithat | Hazer, Baki | Arslan, Hülya

Mo(CO)6 was reacted with the Schiff base ligand obtained by condensation reaction of 2-acetyl- or benzoylpyridine with poly(propylene glycol)bis(2-aminopropyl ether) to obtain polymeric, dinuclear metal tetracarbonyl compounds. The long-chain Schiff base complexes are highly soluble even in non-polar solvents such as petroleum ether, diethyl ether and n-hexane. These complexes, as free-radical initiators, afforded methyl methacrylate polymerization in chlorinated solvents. Copyright © 2004 John Wiley & Sons, Ltd.

Makale 2005 Applied Organometallic Chemistry19 ( 1 ) , pp. 7 - 80 594 Görüntülenme

The synthesis of PHA-g-(PTHF-b-PMMA) multiblock/graft copolymers by combination of cationic and radical polymerization

Macit, Hülya | Hazer, Baki | Arslan, Hülya | Noda, Isao

A new and promising method for the diversification of microbial polyesters based on chemical modifications is introduced. Poly(3-hydroxy alkanoate)-g-(poly(tetrahydrofuran)-b-poly(methyl methacrylate)) (PHAg-(PTHF-b-PMMA)) multigraft copolymers were synthesized by the combination of cationic and free radical polymerization. PHA-g-PTHF graft copolymer was obtained by the cationic polymerization of THF initiated by the carbonium cations generated from the chlorinated PHAs, poly(3-hydroxybutyrate-co-3- hydroxyvalerate) (PHBV), and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHx) in the prese ...Daha fazlası

Makale 2009 Journal of Applied Polymer Science111 ( 5 ) , pp. 2 - 2317 819 Görüntülenme
Erişime Açık

One-step synthesis of triarm block copolymers via simultaneous reversible-addition fragmentation chain transfer and ring-opening polymerization

Öztürk, Temel | Göktaş, Melahat | Hazer, Baki

One-step synthesis of star copolymers by reversible addition-fragmentation chain transfer (RAFT) and ring-opening polymerization (ROP) by using a novel dual initiator is reported. Triarm block copolymers comprising one polystyrene (or polyacrylamide) arm and two poly(b-butyrolactone) arms were synthesized in one-step by simultaneous RAFT polymerization of styrene (St) (or acrylamide, designated as AAm) and ROP of b-butyrolactone (BL) in the presence of a novel trifunctional initiator, 1,2-propanediol ethyl xanthogenate (RAFT-ROP agent). This dual initiator was obtained through the reaction of ...Daha fazlası

Makale 2010 Journal of Applied Polymer Science117 ( 3 ) , pp. 1 - 1645 688 Görüntülenme
Erişime Açık

Hyperbranched homo and thermoresponsive graft copolymers by using ATRP-macromonomer initiators

Allı, Sema | Allı, Abdulkadir | Hazer, Baki

Macromonomer initiators behave as macro cross-linkers, macro initiators, and macromonomers to obtain branched and cross-linked block/graft copolymers. A series of new macromonomer initiators for atom transfer radical polymerization (MIM-ATRP) based on polyethylene glycol (M n = 495D, 2203D, and 4203D) (PEG) were synthesized by the reaction of the hydroxyl end of mono-methacryloyl polyethylene glycol with 2-bromo propanoyl chloride, leading to methacryloyl polyethylene glycol 2-bromo propanoyl ester. Poly (ethylene glycol) functionalized with methacrylate at one end was reacted with 2-bromoprop ...Daha fazlası

Makale 2012 Journal of Applied Polymer Science124 ( 1 ) , pp. 5 - 548 786 Görüntülenme
Erişime Açık

Nitroxide-mediated copolymerization of styrene and pentafluorostyrene initiated by polymeric linoleic acid

Allı, Abdulkadir | Allı, Sema | Becer, C. Remzi | Hazer, Baki

Polymeric linoleic asit graft copolymers were synthesized via a nitroxide-mediated radical polymerization (NMRP) method in the presence of 2,2-6,6-tetramethylpiperidinyl-1-oxy (TEMPO). For this purpose, PLina-ox was exposed to polymerization with styrene (Sty) or Sty and pentafluorostyrene (F5Sty) in the presence of TEMPO by NMRP method in order to obtain PLina-g-PSty and PLina-g-PF5Sty-g-PSty graft copolymers with controlled structure and low polydispersity. Chain extension study was evaluated. Principal parameters, such as monomer concentration, initiator concentration, and polymerization ti ...Daha fazlası

Makale 2016 European Journal of Lipid Science and Technology118 ( 2 ) , pp. 2 - 287 863 Görüntülenme
Erişime Açık

Novel Enzymatic Rhodium Modified Poly(styrene-g-oleic amide) Film Electrode for Hydrogen Peroxide Detection

Kılıç, Muhammet Samet | Korkut, Şeyda | Hazer, Baki

Newly synthesized poly(styrene-g-oleic amide) was coated onto a rhodium nanoparticle modified glassy carbon (GC) surface for the fabrication of horseradish peroxidase based biosensor used for hydrogen peroxide detection. The rhodium modifed electrode presented ten times higher signal than unmodified electrode even at low elecrtroactive enzyme quantity by enhancing the electron transfer rate at the applied potential of -0.65 V. The biosensor designed by under the optimized rhodium electrodeposition time exhibited a fast response less than 5 s, an excellent operational stability with a relative ...Daha fazlası

Makale 2017 Electroanalysis29 ( 10 ) , pp. 2 - 2384 1074 Görüntülenme
Erişime Açık

Treatment of severe amitriptyline intoxication with plasmapheresis

Kolsal, Ebru | Tekin, İshak Özel | Pişkin, Etem | Aydemir, Cumhur | Akyüz, Mehmet | Çabuk, Hasan | Eldes, Nilüfer | Numanoğlu, Kemal Varın

Tricyclic antidepressant poisoning is one of the most common causes of serious intoxication. Here, we report a 2-year-old girl with severe amitriptyline (70 mg/kg) intoxication. She was in comatose, had generalized tonic clonic seizure, ventricular tachycardia, and wide QRS complexes. Although she did not respond to classical therapies, very good clinical response to plasmapheresis was obtained and she developed no complications. Thus, plasmapheresis may be an effective treatment modality in poisoning with drugs, which bind to plasma proteins with high affinity. © 2009 Wiley-Liss, Inc.

Makale 2009 Journal of Clinical Apheresis24 ( 1 ) , pp. 2 - 24 1375 Görüntülenme
Erişime Açık

Synthesis and characterization of polymeric linseed oil grafted methyl methacrylate or styrene

Çakmaklı, Birten | Hazer, Baki | Tekin, İshak Özel | Kızgut, Sait | Köksal, Murat | Menceloğlu, Yusuf

Syntheses of wholly natural polymeric linseed oil (PLO) containing peroxide groups have been reported. Peroxidation, epoxidation and/or perepoxidation reactions of linseed oil, either under air or under oxygen flow at room temperature, resulted in polymeric peroxides, PLO-air and PLO-ofl, containing 1.3 and 3.5 wt.-% of peroxide, with molecular weights of 2 100 and 3 780 Da, respectively. PLO-air contained cross-linked film up to 46.1 wt.-% after a reaction time of 60 d, associated with a waxy, soluble part (PLO-air-s) that was isolated with chloroform extraction. PLO-ofl was obtained as a wax ...Daha fazlası

Makale 2004 Macromolecular Bioscience4 ( 7 ) , pp. 6 - 655 1426 Görüntülenme
Erişime Açık

One-step synthesis of block-graft copolymers via simultaneous reversible-addition fragmentation chain transfer and ring-opening polymerization using a novel macroinitiator

Öztürk, Temel | Atalar, Mehmet Nuri | Göktaş, Melahat | Hazer, Baki

One-step synthesis of block-graft copolymers by reversible addition-fragmentation chain transfer (RAFT) and ring-opening polymerization (ROP) by using a novel initiator was reported. Block-graft copolymers were synthesized in one-step by simultaneous RAFT polymerization of n-butylmethacrylate (nBMA) and ROP of ?-caprolacton (CL) in the presence of a novel macroinitiator (RAFT-ROP agent). For this purpose, first epichlorohydrin (EPCH) was polymerized by using H2SO4 via cationic ring-opening mechanism. And then a novel RAFT-ROP agent was synthesized by the reaction of potassium ethyl xanthogenat ...Daha fazlası

Makale 2013 Journal of Polymer Science, Part A: Polymer Chemistry51 ( 12 ) , pp. 2 - 2659 749 Görüntülenme
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