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Bulunan: 24 Adet 0.080 sn

Dergi Adı : Journal of Applied P ... ✕

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İlgili Araştırmacılar [9]

Ambargo Durumu [1]

Tam Metin [2]

Yazar [41]

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Yayın Yılı [12]

Yayın Dili [2]

Dergi Adı [1]

Yayıncı [1]

Konu Başlıkları [80]

Kapsam [1]

Erişim Türü [3]

Hakem Türü [1]

JCR_QUARTILE [1]

ENDEKS [3]

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

Synthesis of PMMA-PTHF-PMMA and PMMA-PTHF-PST linear and star block copolymers

Macit, Hülya | Hazer, Baki

Combination of cationic, redox free radical, and thermal free radical polymerizations was performed to obtain linear and star polytetramethylene oxide (poly-THF)-polymethyl methacrylate (PMMA)/polystyrene (PSt) multiblock copolymers. Cationic polymerization of THF was initiated by the mixture of AgSbF6 and bis(4,4' bromo-methyl benzoyl) peroxide (BBP) or bis (3,5,3',5' dibromom-ethyl benzoyl) peroxide (BDBP) at 20°C to obtain linear and star poly-THF initiators with MW varying from 7,500 to 59,000 Da. Poly-THF samples with hydroxyl ends were used in the methyl methacrylate (MMA) polymerization ...Daha fazlası

Makale 2004 Journal of Applied Polymer Science93 ( 1 ) , pp. 2 - 226 649 Görüntülenme

Synthesis and characterization of diblock, triblock, and multiblock copolymers containing Poly(3-hydroxy butyrate) units

Arslan, Hülya | Menteş, Ayfer | Hazer, Baki

A poly[(R,S)-3-hydroxybutyrate] macroinitiator (PHB-MI) was obtained through the condensation reaction of poly[(R,S)-3-hydroxybutyrate] (PHB) oligomers containing dihydroxyl end functionalities with 4,4'-azobis(4-cyanopentanoyl chloride). The PHB-MI obtained in this way had hydroxyl groups at two end of the polymer chain and an internal azo group. The synthesis of ABA-type PHB-b-PMMA block copolymers [where A is poly(methyl methacrylate) (PMMA) and B is PHB] via PHB-MI was accomplished in two steps. First, multiblock active copolymers with azo groups (PMMA-PHB-MI) were prepared through the red ...Daha fazlası

Makale 2004 Journal of Applied Polymer Science94 ( 4 ) , pp. 1 - 1796 691 Görüntülenme

Synthesis of asymmetric star-branched block copolymers based on PS, PTHF, and PMMA by combination of cationic ring opening polymerization and redox polymerization methods

Arslan, Hülya | Hazer, Baki | Higashihara, Tomota | Hirao, Akira

Asymmetric star-branched block copolymers based on polystyrene (PS), polytetrahydrofuran (PTHF), and poly(methyl methacrylate) (PMMA) were synthesized by a combination of cationic ring opening polymerization and redox polymerization methods in two steps. At first, cationic ring opening polymerization of THF was initiated by using chain-end-multifunctionalized polystyrenes with 2, 4, and 8 benzyl bromide moieties as initiators in the presence of AgSbF6 at 30°C to obtain 3-, 5-, and 9-arm AB 2/ AB4, and AB8 type asymmetric star-branched polymers consisting of PS (A) and PTHF-OH (B) segments. Pol ...Daha fazlası

Makale 2006 Journal of Applied Polymer Science102 ( 1 ) , pp. 5 - 522 632 Görüntülenme

Erişime Açık

PMMA-multigraft copolymers derived from linseed oil, soybean oil, and linoleic acid: Protein adsorption and bacterial adherence

Çakmaklı, Birten | Hazer, Baki | Açıkgöz, Şerefden | Can, Murat | Cömert, Füsun B.

Synthesis of Poly(methyl methacrylate), PMMA-multigraft copolymers derived from linseed oil, soybean oil, and linoleic acid PMMA-g-polymeric oil/oily acid-g-poly(3-hydroxy alkanoate) (PHA), and their protein adsorption and bacterial adherence have been described. Polymeric oil/oily acid peroxides [polymeric soybean oil peroxide (PSB), polymeric linseed oil peroxide (PLO), and polymeric linoleic acid peroxide (PLina)] initiated the copolymerization of MMA and unsaturated PHA-soya to yield PMMA-PLO-PHA, PMMA-PSB-PHA, and PMMA-PLina-PHA multigraft copolymers. PMMA-PLina-PHA multigraft copolymers ...Daha fazlası

Makale 2007 Journal of Applied Polymer Science105 ( 6 ) , pp. 3 - 3457 1446 Görüntülenme

Erişime Açık

Acetylsalicylic acid loading and release studies of the PMMA-g-polymeric oils/oily acids micro and nanospheres

Kızılçay, Ebru | Çakmaklı, Birten | Hazer, Baki | Denkbaş, Emir Baki | Açikgöz, Bektaş

Poly(methyl methacrylate) (PMMA) and PMMA copolymers derived from plant oils (Polylinseed oil-g-PMMA, Polysoybean oil-g-PMMA, Polylinoleic acid-g-PMMA (PLina-g-PMMA) and Polyhydroxy alkanoate- sy-g-Polylinoleic acid-g-PMMA (PHA-g-PLina-g-PMMA)) as hydrophobic polymers, a series of hydrophobic microsphere or nanosphere dispersions, were prepared by the emulsion/solvent evaporation method. The diameters of the nanospheres and microspheres were measured by dynamic light scattering with a zetasizer, optically and by scanning electron microscopy. The magnetic quality of the microspheres was determi ...Daha fazlası

Makale 2011 Journal of Applied Polymer Science119 ( 3 ) , pp. 1 - 1618 723 Görüntülenme

Erişime Açık

Effect of the composition of methanol-water mixtures on tacticity of poly(N-ethylacrylamide) gel

Biswas, Chandra Sekhar | Sulu, Elvan | Hazer, Baki

Two series of macroporous poly(N-ethylacrylamide) (PNEAM) gels are synthesized in different composition of methanol-water mixtures (xm=0, 0.06, 0.13, 0.21, 0.31, and 0.43; where xm=mole fraction of methanol) in presence as well as in the absence of 0.1M Y(OTf)3 Lewis acid as additive. The gels synthesized in the absence of Lewis acid are atactic and in the presence of the same are isotactic. Synthesis of the corresponding linear PNEAM homopolymers shows that, the isotacticity (meso dyad, %) of the resulted polymers increases for the gels prepared in the presence of Lewis acid (LA) and remains ...Daha fazlası

Makale 2015 Journal of Applied Polymer Science132 ( 12 ) 661 Görüntülenme

Erişime Açık

Grafting of poly(3-hydroxyalkanoate) and linoleic acid onto chitosan

Arslan, Hülya | Hazer, Baki | Yoon, Sung C.

Poly(3-hydroxy octanoate) (PHO), poly(3-hydroxy butyrate-co-3- hydroxyvalerate) (PHBV), and linoleic acid were grafted onto chitosan via condensation reactions between carboxylic acids and amine groups, Unreacted PHAs and linoleic acid were eliminated via chloroform extraction and for elimination of unreacted chitosan were used 2 wt % of HOAc solution. The pure chitosan graft copolymers were isolated and then characterized by FTIR, 13C-NMR (in solid state), DSC, and TGA. Microbial polyester percentage grafted onto chitosan backbone was varying from 7 to 52 wt % as a function of molecular weigh ...Daha fazlası

Makale 2007 Journal of Applied Polymer Science103 ( 1 ) , pp. 8 - 89 649 Görüntülenme

Electrochemical synthesis and characterization of polycarbazole

Macit H. | Sen S. | Saçak M.

Electroinitiated polymerization of carbazole was achieved in acetonitrile by direct electron transfer via constant potential electrolysis based on anodic peak potentials. The anodic peak potential of carbazole was determined by cyclic voltammetry to be + 1.4V. It has been observed that polymer yield increased with some factors, such as time, monomer concentration, and polymerization potential. Conducting polycarbazole material obtained on a platinum anode electrode was characterized by FT-IR, TGA, and con ductance measurements. The conductivities of samples were measured to be about 10 -3-10-4 ...Daha fazlası

Makale 2005 Journal of Applied Polymer Science96 ( 3 ) , pp. 8 - 898 204 Görüntülenme

Influence of pretreatment on shear strength of various wood species

Uysal B.

A study was conducted to determine the effects of wood pretreatment on the bonding strength of wood materials. The woods used for the test samples (based on BS EN 204) were oriental beech (Fagus orientalis Lipsky), Scotch pine (Pinus sylvestris L.), oak (Quercus petreae Liebl.), and chestnut (Castanea sativa Mill.). They were impregnated with Tanalith-C, creosote, and Protim 230 WR-paraffin by full-cell methods according to ASTM D 1413-76 standards and the directions of the manufacturers. After impregnation, shear strength tests (based on BS EN 205) were applied on the samples bonded with poly ...Daha fazlası

Makale 2006 Journal of Applied Polymer Science100 ( 1 ) , pp. 2 - 252 275 Görüntülenme