Yazar "Mart H." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Ionic complex formation of polyamidines with proton donor chromophores
    (China Press, 2005) Böhme F.; Sharavanan K.; Tenkovtsev A.V.; Dudkina M.M.; Mart H.
    Ionic complex formation of various proton donors with poly (1, 8-octamethyleneacetamidine) in solution and in the solid phase was investigated by UV/vis spectroscopy and DSC. It could be shown that due to the strong basicity of the polyamidine a deprotonation of the proton donors occurred. In case of phenolic group containing chromophores deprotonation resulted in a significant bathochromic shift of the chromophore's longest wavelength absorption band by more than 100 nm. Beside the optical properties, the thermal behavior of the mixtures was also influenced by the interactions between polymer and proton donor. An increase of the glass transition temperature of the polymer about 140 K was attributed to an ionic network formation and molecular reinforcement effects. The complexes possess good film forming properties and sufficiently high thermal stability. Chromophores covalently bound to the chain end of an amino group terminated polyether (Jeffamine®) showed a similar behavior. Blends of such modified poly-ethers with poly (1, 8- octamethyleneacetamidine) exhibited improved compatibility.
  • Küçük Resim Yok
    Öğe
    Synthesis and characterization of thermally stable oligomermetal complexes of copper(II), nickel(II), zinc(II) and cobalt(II) derived from oligo-p-nitrophenylazomethinephenol
    (2006) Vural U.S.; Mart H.; Demir H.O.; Sariöz O.; Muradoglu V.; Koç M.C.
    Thermally stable metal complexes based on oligomers were prepared by the reaction between oligo-p-nitrophenilazomethinephenol (ONPAP) and Cu(II), Ni(II), Zn(II) and Co(II) ions. The properties of oligomer-metal complexes were studied by elemental, FT-IR and magnetic moments analyses. The thermal stabilities of the oligomer-metal complexes were compared by thermogravimetric (TG) and differential thermal (DTA) analyses. According to TG, oligomer-metal complexes were stable against to temperature and thermooxidative decomposition. The weight losses of oligomer-metal complexes were found to be 5 and 50% at 200 and > 850 (Cu(II)), 172 and 600 (Ni(II)), 252 and > 850 (Zn(II)) and 174 and 510 (Co(II)), °C, respectively. Based on half degradation temperature parameters Cu(II) and Zn(II) complexes were more resistant than the others. © 2006 Chemical Society of Ethiopia.