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Öğe (2-fenil-1,3-dioksalan-4-il) metilmetakrilat'ın N-vinilpirolidon ve akrilonitril ile kopolimerlerinin sentezi ve karakterizasyonu(1998) Özdemir, Eyüp; Ahmedzade, Mısır; İlter, Zülfiye; Soykan, Cengiz; Ergin, MehmetBu çalışmada, gliserin, benzaldehit ve metakroilklorürden, yeni bir monomer, (2-fenil-l,3-dioksalan-4-il) metilmetakrilat elde edildi. Bu monomerin, 1,4-dioksanda benzoilperoksitin başlatıcı olarak kullanılmasıyla N-vinilpirolidon (N.VP) ve Akrilonitril (AN) ile kopolimerleri hazırlandı. Monomer ve kopolimerlerin karakterizasyonu İR, ^H-NMR ve ^C-NMR teknikleri ile yapıldı. Titrasyon yöntemiyle polimerlerin çözünürlük parametreleri tayin edildi. DSC (Diferansiyel Taramalı Kalorimetre) ile de termal özellikleri incelendi.Öğe Determination of thermodynamic properties of poly (2-hydroxy ethyl methacrylate) at infinite dilution by using inverse gas chromatography(Freund Publishing House Ltd, 2000) Demirelli, Kadir; Kaya, İsmet; Özdemir, EyüpSome thermodynamic quantities were obtained for the interactions of poly (2-hydroxy ethyl methacrylate) (PHEMA) with alcohols, ketones, acetates, aromatics and n-alkanes by the inverse gas chromatography method in the temperature range of 130-150 degreesC. The specific retention volumes, Vg degrees, weight fraction activity coefficients of solute probes at infinite dilution, Omega (infinity)(1) Flory-Huggins thermodynamic interaction parameters, chi (infinity)(12), between polymers and solvents, the partial molar free energy, DeltaG(1)(infinity), the partial molar heat of mixing, DeltaH(1)(infinity), were determined. All the liquids were found to be nonsolvents for poly (2-hydroxy ethyl methacrylate) at 130-150 degreesC. The solubility parameters for PHEMA at infinite dilution were found by plotting the graph of [(delta (2)(1)/RT) - chi (infinity)(12)/VI] versus solubility parameters, delta (1), of these probes. The solubility parameter values of PHEMA found from both the slope and intercept in Fig. 2 are 6.24 (cal/cm(3))(0.5) and 7.08 (cal/cm(3))(0.5) at 140 degreesC.Öğe Schiff bazı sübstitüentli oligofenollerin sentezi ve karakterizasyonu(2003) Kaya, İsmet; Bahçeci, Dilek Şenol; Koyuncu, Sermet; Özdemir, EyüpBu çalışmada, 2-aminofenol, 3-aminofenol, 4-aminofenol ile benzaldehit'in reaksiyonundan Schiff bazları elde edildi. Daha sonra oligo fenollerle NaOCl, $H_2O_$2 ve hava oksijenin oksidatif polikondenzasyon reaksiyon şartlan ve onların ürünleri incelendi. Schiff bazı sübstitüentli oligo fenoller alkali ortamda 50-100°C arasında 2-aminofenol, 3-aminofenol, 4-aminofenol ile benzaldehit'in oksidadif polikondenzasyonundan sentezlendi. Sentezlenmiş ürünlerin yapıları element analizi, FT-IR, $^1H-NMR$, $^{13}C-NMR$ ve UV-Vis spektrumlarındaki verilerinden faydalanarak belirlendi. O-2-HFBA-I, O-2-HFBA-II, O-3-HFBA ve O-4-HFBA'mn büyüklükçe ayırma kromatografısi analizleri (SEÇ) göre, sayıca ortalama molekül ağırlığı $(M_n)$, ağırlıkça ortalama molekül ağırlığı $(M_w)$ ve polidispersiti indeksi (PDI) değerleri sırasıyla 2166 g $mol^{-1}$, 2591 g $mol^{-1}$, 1,196; 1736 g $mol^{-1}$, 2509 g $mol^{-1}$, 1,445; 2372 g $mol^{-1}$, 4722 g $mol^{-1}$, 1,990 ve 2155 g $mol^{-1}$, 4164 g $mol^{-1}$ ve 1,737 olarak bulundu. Ayrıca, DTA ve TG analizleri oligo-2-hidroksifenilbenzaldimin (O-2-HPBA),oligo-3-hidroksifenilbenzaldimin (O-3-HPBA) ve oligo-4-hidroksifenilbenzaldimin (O-4-HPBA) thermo-oksidatif bozunmaya karşı kararlı olduklarını gösterdi. O-2-HPBA. O-3-HPBA ve O-4-HPBA'nın 1000°C'deki kütle kayıpları sırasıyla %93,63, %59,46 ve %95,87 olarak bulundu. Buna ilaveten, epoksi-oligomer blend karışımlarının termal özellikleri incelendi. Epoksi-oligomer blend karışımının 1000°C'deki kütle kaybı %55 olarak bulundu.Öğe Synthesis, characterization and thermal degradation of oligo-2-[(4- iodophenylimino)methyl|phenol and ol1gomer-metal complexes(2009) Kaya, İsmet; Moral, Fatma; Özdemir, EyüpThe conditions for oxidative condensation of 2-[(4-iodophenylimino)methyl] pheno| (1P1MP) were studied with air and NaOCI as oxidants in an aqueous alkaline medium between 50 and 90°C. Size exclusion chromatography (SEC) showed that the number-average molecular weight (Mn), weight-average molecular weight (Mw) and polydispersity index (PDI) values, respectively, were 1250, 1300 g mol-1 and 1.040 for oxidation with NaOCI and 2200, 2500 g mol-1 and 1.136 for oxidation by air. With the optimum reaction conditions, the yield of OIPIMP was found to be 67 % with NaOCI, and 29 % with air, as oxidant. The OIPIMP was characterized by 1H-NMR, 13C-NMR, FT-1R, UV-Vis and elemental analysis. Metal complexes of the oligomerwere shown to be more thermally stable than OIPIMP itself. © 2009 Chemical Society of Ethiopia.Öğe Synthesis, characterization, and thermal degradation of oligo-2-[(4-chlorophenyl) imino methylenel phenol and its oligomer-metal complexes(Taylor & Francis Inc, 2005) Kaya, İsmet; Kızılkaya, Bayram; Özdemir, EyüpThe oxidative polycondensation reaction conditions of 2-[(4-chlorophenyl) imino methylene] phenol (CPIMP) were studied by air O-2 and NaOCl oxidants at various temperatures and times. Optimum reaction conditions of air O-2 and NaOCl were determined for CPIMP. Oligo-2-[(4-chlorophenyl) imino methylene] phenol (OCPIMP) was synthesized from the oxidative polycondensation of CPIMP with air O-2 and NaOCl in alkaline medium between 50 and 90 degrees C. The number-average molecular weight (M-n) weight-average molecular weight (M-n) and polydispersity index (PDI) values of OCPIMP were found to be 470 g mol(-1), 895 g mol(-1), and 1.90, using NaOCl, and 455 g mol(-1), 765 g mol(-1), and 1.68, using air O-2, respectively. At the optimum reaction conditions, the yield of OCPIMP was found to be 62.80% (for air O-2 oxidant) and 87.50% (for NaOCl oxidant). The OCPIMP was characterized by H-1-NMR, FT-IR, UV-Vis and elemental analysis. The thermogravimetric (TGA)-DTA analyses were shown to be stable of OCPIMP and its oligomer metal complexes (such as Co+2, Ni+2, and Cu+2) against thermo-oxidative decomposition. The weight loss of OCPIMP and its oligomer metal complexes (such as Co+2, Ni+2, and Cu+2) were found to be 98%, 85%, 80%, and 82%, respectively, at 1000 degrees C.Öğe The oxidative polycondensation of 4-[(Phenylimino)methyl] phenol using NaOCl, air oxygen, and H2O2 at alkaline and neutral medium(Taylor & Francis Ltd, 2006) Kaya, İsmet; Karayiğitler, Halil; Özdemir, EyüpIn this study, the oxidative polycondensation reaction conditions of 4-[(phenylimino) methyl] phenol (4-PIMP) with air oxygen, H2O2 , and NaOCl oxidants in aqueous alkaline and neutral medium between 50 degrees and 90 degrees C were examined. 4-PIMP and its condensation product, oligo-4-[(phenylimino) methyl] phenol (O-4-PIMP), were characterized by H-1-C-13-NMR, FT-IR, UV-vis techniques, and elemental analysis. At the optimum reaction conditions, the yield of oligo-4-[(phenylimino) methyl] phenol was found to be 73% for NaOCl, 65% for air O-2 , and 70% for H2O2 . According to size exclusion chromatography (SEC) analyses, the number-average molecular weight (M n ), weight-average molecular weight (M w ), and polydispersity index (PDI) values of O-4-PIMP were 5268, 10320 g mol(-1) , and 1.959, respectively, using air O 2 ; 8215, 17789 g mol(-1) , and 2.165, respectively, using NaOCl; and 4800, 5260 g mol(-1) , and 1.096, respectively, using H2O2. The carbon residues for 4-PIMP and O-4-PIMP were found to be 42.4% and 53.4%, respectively, at 1000 degrees C by using TG-DTA analyses.
