Yazar "Rzaev, Zakir M. O." seçeneğine göre listele

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    Bioengineering functional copolymers. IX. synthesis and characterization of stimuli-responsive poly(N-isopropylacrylamide-co-N-vinyl-2-pyrrolidone) and its Cu(II) complexes
    (2008) Rzaev, Zakir M. O.; Denizli, Betül Kırcı; Denizli, Haluk
    Radical copolymerization of N-isopropylacrylamide (NIPA) with N-vinyl-2-pyrrolidone (VP) were carried out with 2,2’- azobisisobutyronitrile (AIBN) as an intiator in N,N’-dimethylformamide solution at $65^ oC$ under nitrogen atmosphere. Cu(II)–copolymer macrocomplexes were prepared by incorporation of copolymers with copper sulfate in aqueous solution at $40^ oC$. Structure and composition of the obtained copolymers, and the formation of coordinated Cu(II)- complexes between amide VP unit and Cu(II) ions were studied by FTIR spectroscopy, DSC and TGA-DTG methods, as well as by the electrical conductivity measurements. Compositon of the copolymers synthesized in a wide range of monomer feed ratios were determined by FTIR and $^ 1H (^ {13}C)$ NMR–DEPT-135 spectroscopy. The monomer reactivity ratios were determined by Fineman-Ross, Kelen-Tüdös and non-linear regression methods. It was observed that studied monomer pair has some tendency to alternation in the chosen monomer feed ratios due to formation of intermolecular interaction through H-bonding and N→O=C coordination. The copolymers predominantly show amorphous structure while their Cu(II)–macrocomplexes exhibit crystalline phase. The conductive properties of the synthesized Cu(II)–poly(VP-co-NIPA) complexes was also discussed.The synthesized poly(NIPA-co-VP)s show temperature sensitiveness ($T _s$) and higher glass-transition temperature ($T _g$) and thermal stability, polyelectrolyte and stimuli-responsive (temperature- and pH-sensitive) behavior, and can be attributed to the class of bioengineering functional copolymers useful for application in various gene- and bioengineering processes, drug delivery systems, and biomacromolecule conjugations.
  • Küçük Resim Yok
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    POLY 204-Bioengineering functional copolymers: Copper(II)-poly(N-vinyl-2-pyrrolidone-co-N-isopropylacrylamide) macrocomplexes
    (Amer Chemical Soc, 2006) Denizli, Betül K.; Dinçer, Sevil; Denizli, Haluk; Rzaev, Zakir M. O.
    Poly(N-vinyl-2-pyrrolidone-co-N-isopropylacrylamide)s [poly(VP-co-NIPA)]s with alternating and random structure were synthesized by radical copolymerization of VP and NIPA with 2,2'-azobisisobutyronitrile as initiator in N,N'-dimethylformamide solutions at 70oC under nitrogen atmosphere using a wide range of the monomer feed ratios.
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    Synthesis of copolymers of tert-butyl vinyl ether with maleic and citraconic anhydrides
    (Wiley, 2006) Denizli, Betül Kırcı; Can, Hatice Kaplan; Rzaev, Zakir M. O.; Güner, Ali
    In the Present Study, the effects of charge-transfer complex formation and intra molecular fragmentation (side-chain lactonization) in radical copolymerization of terf-butyl vinyl ether (t-BVE) with anhydrides of maleic (MA) and citraconic (CA) acids and the structure-thermal behavior relationships of the resulting copolymers were examined using the H-1-NMR, FTIR, DSC, and TGA analysis methods. It was shown that copolymerization under the chosen conditions proceeded through intramolecular fragmentation with the formation of gamma-lactone units. Side-chain fragmentation of t-BVE-MA and t-BVE-CA copolymers also was confirmed by TGA and DSC analysis.