mehmet coşkun - Academia.edu (original) (raw)

Papers by mehmet coşkun

Research paper thumbnail of Atom transfer radical polymerization of 1-phenoxycarbonyl ethyl methacrylate monomer

European Polymer Journal, 2004

Atom transfer radical polymerization conditions with copper(I) bromide/2,2 0-bipyridine (Cu/2,2 0... more Atom transfer radical polymerization conditions with copper(I) bromide/2,2 0-bipyridine (Cu/2,2 0-bpy) as the catalyst system were employed for the homopolymerization and random copolymerization of 1-phenoxycarbonyl ethyl methacrylate (PCMA) with methyl methacrylate (MMA). Temperature studies indicated that the polymerizations occurred smoothly in bulk at 110°C. Poly(PCMA)(polydispersity index ¼ 1.27) homopolymer was characterized and then used as macroinitiator for increasing its molecular weight. The homopolymerization of PCMA was also carried out under free radical conditions using 2,2 0-azobisisobutyronitrile as an initiator. The monomer and polymers were characterized by FT-IR and 1 H and 13 C-NMR techniques. The glass transition temperatures, the solubility parameters and average-molecular weights of the polymers were determined. Thermal stabilities of the polymers were given as compared with each other by using TGA curves. Thermal degradation products of poly(PCMA)s obtained by ATRP and free radical polymerization were compared with each other by using 1 H-NMR technique.

Research paper thumbnail of Graft copolymerization of poly(styrene-co-p-choloromethylstyrene) with methyl methacrylate and acryloylmorpholine by atom transfer radical polymerization: Graft copolymer characterization and monomer reactivity ratios

Journal of Polymer Science Part A: Polymer Chemistry, 2005

Poly[styrene-graft-(acryloylmorpholine-co-methyl methacrylate)] graft copolymers in various compo... more Poly[styrene-graft-(acryloylmorpholine-co-methyl methacrylate)] graft copolymers in various compositions, poly(styrene-graft-acryloylmorpholine), and poly (styrene-graft-methyl methacrylate) were prepared by atom transfer radical polymerization with poly(styrene-cop -chloromethylstyrene) (62/38) as the macroinitiator in the presence of CuBr/1,2-dipiperidinoethane at 130 8C in N,N-dimethylformamide. The graft copolymers were characterized by elemental analysis, IR, 1 H and 13 C NMR, and differential scanning calorimetry. The thermal stabilities of the graft copolymers were investigated by thermogravimetric analysis. The monomer reactivity ratios in the graft copolymerization of acryloylmorpholine (r 1) and methyl methacrylate (r 2) were calculated by the application of linear methods, such as the Finemann-Ross, inverted Finemann-Ross, Yezrielev-Brokhina-Roskin, Kelen-Tü dos, and extended Kelen-Tü dos methods, and the Mayo-Lewis method, which uses an integrated copolymer equation in a terminal model of copolymerization. r 1 was 1.13-2.11, and r 2 was 0.49-1.05, according to the various methods. The Yezrielev-Brokhina-Roskin method gave the best linearity for the experimental results, and the r 1 and r 2 values were 1.28 and 0.54, respectively. V

Research paper thumbnail of Atom transfer radical polymerization of 1-phenoxycarbonyl ethyl methacrylate monomer

European Polymer Journal, 2004

Atom transfer radical polymerization conditions with copper(I) bromide/2,2 0-bipyridine (Cu/2,2 0... more Atom transfer radical polymerization conditions with copper(I) bromide/2,2 0-bipyridine (Cu/2,2 0-bpy) as the catalyst system were employed for the homopolymerization and random copolymerization of 1-phenoxycarbonyl ethyl methacrylate (PCMA) with methyl methacrylate (MMA). Temperature studies indicated that the polymerizations occurred smoothly in bulk at 110°C. Poly(PCMA)(polydispersity index ¼ 1.27) homopolymer was characterized and then used as macroinitiator for increasing its molecular weight. The homopolymerization of PCMA was also carried out under free radical conditions using 2,2 0-azobisisobutyronitrile as an initiator. The monomer and polymers were characterized by FT-IR and 1 H and 13 C-NMR techniques. The glass transition temperatures, the solubility parameters and average-molecular weights of the polymers were determined. Thermal stabilities of the polymers were given as compared with each other by using TGA curves. Thermal degradation products of poly(PCMA)s obtained by ATRP and free radical polymerization were compared with each other by using 1 H-NMR technique.

Research paper thumbnail of Graft copolymerization of poly(styrene-co-p-choloromethylstyrene) with methyl methacrylate and acryloylmorpholine by atom transfer radical polymerization: Graft copolymer characterization and monomer reactivity ratios

Journal of Polymer Science Part A: Polymer Chemistry, 2005

Poly[styrene-graft-(acryloylmorpholine-co-methyl methacrylate)] graft copolymers in various compo... more Poly[styrene-graft-(acryloylmorpholine-co-methyl methacrylate)] graft copolymers in various compositions, poly(styrene-graft-acryloylmorpholine), and poly (styrene-graft-methyl methacrylate) were prepared by atom transfer radical polymerization with poly(styrene-cop -chloromethylstyrene) (62/38) as the macroinitiator in the presence of CuBr/1,2-dipiperidinoethane at 130 8C in N,N-dimethylformamide. The graft copolymers were characterized by elemental analysis, IR, 1 H and 13 C NMR, and differential scanning calorimetry. The thermal stabilities of the graft copolymers were investigated by thermogravimetric analysis. The monomer reactivity ratios in the graft copolymerization of acryloylmorpholine (r 1) and methyl methacrylate (r 2) were calculated by the application of linear methods, such as the Finemann-Ross, inverted Finemann-Ross, Yezrielev-Brokhina-Roskin, Kelen-Tü dos, and extended Kelen-Tü dos methods, and the Mayo-Lewis method, which uses an integrated copolymer equation in a terminal model of copolymerization. r 1 was 1.13-2.11, and r 2 was 0.49-1.05, according to the various methods. The Yezrielev-Brokhina-Roskin method gave the best linearity for the experimental results, and the r 1 and r 2 values were 1.28 and 0.54, respectively. V