Search results for: Olgun Güven

Items from 1 to 20 out of 124 results

article

Tunable fluorescent and antimicrobial properties of poly(vinyl amine) affected by the acidic or basic hydrolysis of poly(N‐vinylformamide)

S. Duygu Sütekin, Sahin Demirci, Saliha B. Kurt, Olgun Güven, more

Journal of Applied Polymer Science > 138 > 42 > n/a - n/a

Synthesis of poly(N‐vinylformamide) (PNVF) and its subsequent hydrolysis to convert it to poly(vinyl amine) (PVAm) were performed. Kinetics of acidic and basic hydrolysis of poly(N‐vinylformamide) (PNVF), and products of hydrolysis were investigated by using Fourier transform infrared, size exclusion chromatography, ¹H NMR, and ¹³C NMR spectroscopies, and thermogravimetric analysis. It was observed...

article

Preparation of poly(tert‐butyl acrylate)‐poly(acrylic acid) amphiphilic copolymers via radiation‐induced reversible addition–fragmentation chain transfer mediated polymerization of tert‐butyl acrylate

Semiha Duygu Sütekin, Olgun Güven

Polymer International > 69 > 8 > 693 - 701

Poly(tert‐butyl acrylate) (PtBA) is a versatile hydrophobic macromolecule usually preferred in the development of new materials for a host of applications. PtBA homopolymers with well‐defined structure and controlled molecular weight in a wide range were successfully synthesized via radiation‐induced reversible addition–fragmentation chain transfer (RAFT) polymerization in the presence of a trithiocarbonate...

article

Protein fouling of modified microporous PET track-etched membranes

Ilya V. Korolkov, Anastassiya A. Mashentseva, Olgun Güven, Yevgeniy G. Gorin, more

Radiation Physics and Chemistry > 2018 > 151 > C > 141-148

The effectiveness of membrane-based separations is limited by fouling of the membrane used. In order to mitigate this effect on PET track-etched membranes (PET TeMs), the methods of oxidation in hydrogen peroxide and radiation induced graft polymerization of acrylic acid (AA) and N-vinylimidazole (VIM) were used. The antifouling properties of the modified PET TeMs have been evaluated using model systems,...

article

Electron/gamma radiation-induced synthesis and catalytic activity of gold nanoparticles supported on track-etched poly(ethylene terephthalate) membranes

Ilya V. Korolkov, Anastassiya A. Mashentseva, Olgun Güven, Yevgeniy G. Gorin, more

Materials Chemistry and Physics > 2018 > 217 > C > 31-39

Gold nanoparticles (Au NPs) possess unique properties for research due to their high stability and catalytic activity in electron transfer processes, such as hydrogenation reactions. One of the major challenges for application of Au NPs in heterogeneous catalysis is the search for better support materials to further increase their stability and catalytic activity. In this study, Au NPs were generated...

article

Preparation of multifunctional poly(acrylic acid)-poly(ethylene oxide) nanogels from their interpolymer complexes by radiation-induced intramolecular crosslinking

Thitirat Rattanawongwiboon, Mohammadreza Ghaffarlou, S. Duygu Sütekin, Wanvimol Pasanphan, more

Colloid and Polymer Science > 2018 > 296 > 9 > 1599-1608

Poly(acrylic acid)-poly(ethylene oxide) (PAA-PEO) interpolymer complexes (IPC)s were prepared with equimolar stoichiometric ratio of repeating units and converted to crosslinked nanogels via γ-ray irradiation of aqueous acetone solutions. The effect of acetone concentration on the coil size of nanogels was investigated by dynamic light scattering (DLS). pH and temperature effects on the size and surface...

article

Radiation‐Synthesized Acrylamide/Crotonic Acid Hydrogels for Selective Mercury (II) Ion Adsorption

Dursun Saraydın, Ebru Şahin Yıldırım, Erdener Karadağ, Olgun Güven

Advances in Polymer Technology > 37 > 3 > 822 - 829

In this study, swelling and selective mercury adsorption behavior of novel radiation cross‐linked acrylamide/crotonic acid (AAm/CA) copolymers have been investigated in aqueous mercury (II) ion solutions. Swelling experiments were performed in water and in the solution of mercury (II) ions at 25°C, gravimetrically. The equilibrium swelling (S) values of AAm/CA hydrogels were calculated as 11.00 g...

article

Radiation induced degradation of xanthan gum in aqueous solution

Hande Hayrabolulu, Maria Demeter, Mihalis Cutrubinis, Olgun Güven, more

Radiation Physics and Chemistry > 2018 > 144 > C > 189-193

In our previous study, we have investigated the effect of gamma rays on xanthan gum in the solid state and it was determined that dose rate was an important factor effecting the radiation degradation of xanthan gum. In the present study, in order to provide a better understanding of how ionizing radiation effect xanthan gum, we have investigated the effects of ionizing radiation on aqueous solutions...

article

Detailed positron annihilation lifetime spectroscopic investigation of atrazine imprinted polymers grafted onto PE/PP non‐woven fabrics

Meshude Akbulut Söylemez, Olgun Güven

Journal of Molecular Recognition > 31 > 1 > n/a - n/a

This study presents the preparation of molecularly imprinted matrices by using radiation‐induced grafting technique onto polyethylene/polypropylene (PE/PP) non‐woven fabrics. Atrazine imprinted polymers were grafted onto PE/PP non‐woven fabrics through the use of methacrylic acid (MAA) and ethylene glycol dimethylacrylate (EGDMA) as the functional monomer and crosslinking agent, respectively. Grafted...

article

Chemical modification of PET surface and subsequent graft copolymerization with poly(N-isopropylacrylamide)

Parisa Golshaei, Olgun Güven

Reactive and Functional Polymers > 2017 > 118 > C > 26-34

Thermo-sensitivity has been introduced onto poly(ethylene terephthalate) (PET) surfaces by graft copolymerization of N-isopropylacrylamide (NiPAAm). The PET surface was first photo-oxidized in the presence of H₂O₂, to have enriched concentration of COOH groups which were later reacted with allylamine (AlAm) to introduce vinyl end groups at the surface. These groups were used as active sites for thermally...

article

The effect of oxidation pretreatment of polymer template on the formation and catalytic activity of Au/PET membrane composites

Ilya V. Korolkov, Daryn B. Borgekov, Anastassiya A. Mashentseva, Olgun Güven, more

Chemical Papers > 2017 > 71 > 12 > 2353-2358

This paper reports on the synthesis and structure elucidation of the track-etched membranes with embedded gold nanotubes (prepared in etched-only and COOH-enriched PET track-etched membranes) as well as comparative testing of the catalytic activity of prepared composites. The carboxylic group functionality was enriched by successive oxidation by hydrogen peroxide and UV. “As-prepared” and oxidized...

article

Novel hydrophobic macromonomers for potential amphiphilic block copolymers

Efkan Çatıker, Olgun Güven, Bekir Salih

Polymer Bulletin > 2018 > 75 > 1 > 47-60

Oligomers of 2-methyl nylon3 (2mN3) and 3-methyl nylon3 (3mN3) were synthesized by base-catalyzed hydrogen transfer polymerization (HTP) of methacrylamide and crotonamide, respectively. The detailed structural analyses of 2mN3 and 3mN3 were performed using MALDI-MS, ¹H-NMR, elemental analysis and several end-group analyses to ascertain polymerization mechanism and exact chemical structures of final...

article

Radiation induced deposition of copper nanoparticles inside the nanochannels of poly(acrylic acid)-grafted poly(ethylene terephthalate) track-etched membranes

Ilya V. Korolkov, Olgun Güven, Anastassiya A. Mashentseva, Ayse Bakar Atıcı, more

Radiation Physics and Chemistry > 2017 > 130 > C > 480-487

Poly(ethylene terephthalate) PET, track-etched membranes (TeMs) with 400nm average pore size were UV-grafted with poly(acrylic acid) (PAA) after oxidation of inner surfaces by H₂O₂/UV system. Carboxylate groups of grafted PAA chains were easily complexed with Cu²⁺ ions in aqueous solutions. These ions were converted into metallic copper nanoparticles (NPs) by radiation-induced reduction of copper...

article

Radiation-grafted materials for energy conversion and energy storage applications

Mohamed Mahmoud Nasef, Selmiye Alkan Gürsel, Duygu Karabelli, Olgun Güven

Progress in Polymer Science > 2016 > 63 > Complete > 1-41

Polymer electrolyte membranes are key components in electrochemical power sources that are receiving ever-growing demand for the development of more efficient, reliable and environmentally friendly energy systems. Ongoing research is focusing on materials with high ionic conductivity and stability, at low cost. Among different methods, radiation-induced grafting is a universal attractive method for...

article

Activation of Polyethylene/Polypropylene Nonwoven Fabric by Radiation-Induced Grafting for the Removal of Cr(VI) from Aqueous Solutions

Cengiz Kavaklı, Murat Barsbay, Serhad Tilki, Olgun Güven, more

Water, Air, & Soil Pollution > 2016 > 227 > 12 > 1-16

Cr(VI) adsorption onto a novel fibrous ethylenediamine-functionalized polyethylene/polypropylene (PE/PP-g-PGMA-EDA) nonwoven fabric was investigated in aqueous solutions. The ethylenediamine functionalities were immobilized on the PE/PP nonwoven fabric through the epoxy groups of poly(glycidyl methacrylate) (PGMA) grafted to the fibers via radiation-induced emulsion graft polymerization in aqueous...

article

Radiation induced emulsion graft polymerization of 4-vinylpyridine onto PE/PP nonwoven fabric for As(V) adsorption

Pınar Akkaş Kavaklı, Cengiz Kavaklı, Noriaki Seko, Masao Tamada, more

Radiation Physics and Chemistry > 2016 > 127 > C > 13-20

A novel nonwoven fabric adsorbent having 4-vinylpyridine functional groups was prepared by using radiation-induced emulsion graft polymerization method and grafting 4-vinylpyridine monomer onto a polyethylene-coated polypropylene nonwoven fabric (NWF) in aqueous emulsion solution. The grafting conditions of the 4-vinylpyridine monomer onto the NWF were optimised and 150% D_g VP-g-NWF was prepared using...

article

Amine functionalization of cellulose surface grafted with glycidyl methacrylate by γ-initiated RAFT polymerization

Murat Barsbay, Olgun Güven, Yasko Kodama

Radiation Physics and Chemistry > 2016 > 124 > C > 140-144

This study presents the functionalization of poly(glycidyl methacrylate) (PGMA) grafted cellulose filter paper by a model compound, ethylenediamine (EDA), through the epoxy groups of PGMA. Cellulose based copolymers were prepared via the radiation-induced and RAFT-mediated graft polymerization. The samples were characterized by ATR–FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), elemental...

article

Grafting of N,N-dimethylaminoethyl methacrylate from PE/PP nonwoven fabric via radiation-induced RAFT polymerization and quaternization of the grafts

Jordan F. Madrid, Murat Barsbay, Lucille Abad, Olgun Güven

Radiation Physics and Chemistry > 2016 > 124 > C > 145-154

Radiation induced grafting method is one of the most promising grafting techniques and it works successfully together with the reversible addition fragmentation chain transfer (RAFT) polymerization, one of the most prominent controlled free-radical polymerization (CRP) methods. This study reports grafting of N,N-dimethylaminoethyl methacrylate (DMAEMA) from the surface of polyethylene/polypropylene...

article

Radiation induced degradation of xanthan gum in the solid state

Murat Şen, Hande Hayrabolulu, Pınar Taşkın, Murat Torun, more

Radiation Physics and Chemistry > 2016 > 124 > C > 225-229

In this study, the effect of ionizing radiation on xanthan gum was investigated. Xanthan samples were irradiated with gamma rays in air at ambient temperature in the solid state at different dose rates and doses. Change in their molecular weights was followed by size exclusion chromatography (SEC). Chain scission yield (G(S)), and degradation rate constants (k) were calculated. The calculated G(S)...

article

Enhancing compatibility between poly(lactic acid) and thermoplastic starch using admicellar polymerization

Kasinee Hemvichian, Phiriyatorn Suwanmala, Wararat Kangsumrith, Prapanee Sudcha, more

Journal of Applied Polymer Science > 133 > 31 > n/a - n/a

An alternative method to improve the compatibility between poly(lactic acid) (PLA) and cassava starch (CS) is proposed and investigated. Admicellar polymerization is used to modify the surface of CS with poly(methyl methacrylate) (PMMA) in order to make it more hydrophobic and hence more compatible with PLA. The increased hydrophobicity of PMMA modified cassava starch (MS) is validated by contact...

article

Functionalization of poly(ester‐urethane) surface by radiation‐induced grafting of N‐isopropylacrylamide using conventional and reversible addition–fragmentation chain transfer‐mediated methods

Marta Walo, Grażyna Przybytniak, Murat Barsbay, Olgun Güven

Polymer International > 65 > 2 > 192 - 199

The functionalization of poly(ester‐urethane) (PUR) surface was conducted using radiation‐induced grafting. A thermosensitive layer constructed from N‐isopropylacrylamide (NIPAAm) was introduced onto a polyurethane film and characterized using attenuated total reflection Fourier transform infrared and X‐ray photoelectron spectroscopies and contact angle measurements. Size exclusion chromatography...

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HYDROGEL (13)
SWELLING (9)
GAMMA IRRADIATION (8)
ADSORPTION (5)
IRRADIATION (5)
TRACK-ETCHED MEMBRANES (5)
AMIDOXIMATION (4)
CELLULOSE (4)
POLY(ACRYLIC ACID) (4)
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RAFT MEDIATED GRAFTING (4)
2-HYDROXYETHYL METHACRYLATE (HEMA) (3)
DEGRADATION (3)
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OXIDATION (3)
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2-METHYL NYLON3 (2)
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PET (2)
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INFONA - science communication portal

Search results for: Olgun Güven

Tunable fluorescent and antimicrobial properties of poly(vinyl amine) affected by the acidic or basic hydrolysis of poly(N‐vinylformamide)

Preparation of poly(tert‐butyl acrylate)‐poly(acrylic acid) amphiphilic copolymers via radiation‐induced reversible addition–fragmentation chain transfer mediated polymerization of tert‐butyl acrylate

Protein fouling of modified microporous PET track-etched membranes

Electron/gamma radiation-induced synthesis and catalytic activity of gold nanoparticles supported on track-etched poly(ethylene terephthalate) membranes

Preparation of multifunctional poly(acrylic acid)-poly(ethylene oxide) nanogels from their interpolymer complexes by radiation-induced intramolecular crosslinking

Radiation‐Synthesized Acrylamide/Crotonic Acid Hydrogels for Selective Mercury (II) Ion Adsorption

Radiation induced degradation of xanthan gum in aqueous solution

Detailed positron annihilation lifetime spectroscopic investigation of atrazine imprinted polymers grafted onto PE/PP non‐woven fabrics

Chemical modification of PET surface and subsequent graft copolymerization with poly(N-isopropylacrylamide)

The effect of oxidation pretreatment of polymer template on the formation and catalytic activity of Au/PET membrane composites

Novel hydrophobic macromonomers for potential amphiphilic block copolymers

Radiation induced deposition of copper nanoparticles inside the nanochannels of poly(acrylic acid)-grafted poly(ethylene terephthalate) track-etched membranes

Radiation-grafted materials for energy conversion and energy storage applications

Activation of Polyethylene/Polypropylene Nonwoven Fabric by Radiation-Induced Grafting for the Removal of Cr(VI) from Aqueous Solutions

Radiation induced emulsion graft polymerization of 4-vinylpyridine onto PE/PP nonwoven fabric for As(V) adsorption

Amine functionalization of cellulose surface grafted with glycidyl methacrylate by γ-initiated RAFT polymerization

Grafting of N,N-dimethylaminoethyl methacrylate from PE/PP nonwoven fabric via radiation-induced RAFT polymerization and quaternization of the grafts

Radiation induced degradation of xanthan gum in the solid state

Enhancing compatibility between poly(lactic acid) and thermoplastic starch using admicellar polymerization

Functionalization of poly(ester‐urethane) surface by radiation‐induced grafting of N‐isopropylacrylamide using conventional and reversible addition–fragmentation chain transfer‐mediated methods

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