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  • Küçük Resim
    Öğe
    Synthesis, characterization and thermal degradation kinetics of poly(imino isophthaloyl imino (2,4,8,10-tetraoksoaspiro [5,5] undekan-3,9-dipropylene))
    (World Scientific Publ Co Pte Ltd, 2008) Doğan, Fatih; Akat, Hakan; Kaya, İsmet
    A new polymer, poly(imino isophthaloyl imino (2,4,8,10-tetraoksoaspiro [5,5] undekan-3,9-dipropylene)) [poly(IPIT)] was synthesized by an interfacial polycondensation reaction. The characterization of poly( IPIT) was conducted by using FT-IR, C-13-NMR, TG and DTA techniques. The kinetics of the thermal degradation of poly( IPIT) was investigated by thermogravimetric analysis at different heating rates. TG curves showed that the thermal decomposition of poly( IPIT) occurred in three stages. The apparent activation energies of thermal decomposition for poly( IPIT), as determined by the Tang method (TM), the Flynn-Wall-Ozawa method (FWO) and the Kissinger-Akahira-Sunose method (KAS) are 58.09, 57.7 and 61.0 kJ/mol for the first stage decomposition, 106.1, 105.6 and 109.8 kJ/mol for the second stage decomposition, and 138.1, 137.5 and 141.4 kJ/mol for the third stage decomposition, respectively.
  • Küçük Resim
    Öğe
    Synthesis, characterization, and thermal degradation kinetics of poly(decamethylene 2-oxoglutarate)
    (Wiley, 2008) Doğan, Fatih; Akat, Hakan; Balcan, Mehmet; Kaya, İsmet; Yürekli, Mehmet
    Poly(decamethylene 2-oxoglutarate) [poly (DMOG)] was synthesized by a melt polycondensation reaction. The structure of poly(DMOG) was confirmed by means of Fourier transform infrared, H-1-NMR, and C-13 NMR spectroscopies. The molecular weight distribution values of poly(DMOG) were determined with size exclusion chromatography. The number-average molecular weight, weight-average molecular weight, and polydispersity index values of poly(DMOG) were found to be 13,200, 19,000, and 1.439, respectively. Also, characterization was made by thermogravimetry (TG)-dynamic thermal analysis. The kinetics of the thermal degradation of poly (DMOG) was investigated by thermogravimetric analysis at different heating rates. TG curves showed that the thermal decomposition of poly(DMOG) occurred in one stage. The apparent activation energies of thermal decomposition for poly(DMOG), as determined by the Tang method, the Flynn-Wall-Ozawa method, the Kissinger-Akahira-Sunose method, and the Coats-Redfern method were 122.5, 126.8, 121.4, and 122.9 kJ/mol, respectively. The mechanism function and pre-exponential factor were also determined by the master plots method. (C) 2008 Wiley Periodicals, Inc.