Yazar "Savas, Bedrettin" seçeneğine göre listele

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  • Küçük Resim
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    Synthesis and characterization of comb-type graft copolymers by redox polymerization and "click" chemistry method
    (Springer International Publishing Ag, 2020) Savas, Bedrettin; Ozturk, Temel; Meyvaci, Ergul; Hazer, Baki
    The synthesis of poly(epichlorohydrin- g-methyl methacrylate) [poly(ECH-g-MMA)] comb-type graft copolymers were carried out by use of a "click" chemistry to graft terminally propargyl poly(methyl methacrylate) (PMMA-propargyl) to poly(epichlorohydrin) azido (PECH-N-3). For this purpose, PECH-N-3 was synthesized by using poly(epichlorohydrin) and sodium azide. PMMA-propargyl was obtained by reaction of methyl methacrylate and propargyl alcohol via redox polymerization technique. By using PECH-N-3 and PMMA-propargyl, the comb-type graft copolymers were obtained. Characterization of the modified homopolymers and the comb-type graft copolymers was performed by using FT-IR, H-1-NMR, SEM, GPC, and elemental analysis techniques. Thermal transitions and degradation features of the comb-type graft copolymers were investigated by using DSC and TGA methods. Spectroscopic and thermal analyses revealed that both group modifications and coupling reactions were successfully achieved.
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    Synthesis and characterization of poly(-caprolactone-co-ethylene glycol) star-type amphiphilic copolymers by "click" chemistry and ring-opening polymerization
    (Taylor & Francis Inc, 2018) Ozturk, Temel; Kılıçlıoğlu, Ali; Savas, Bedrettin; Hazer, Baki
    The synthesis of poly(-caprolactone-co-ethylene glycol) AAB star-type amphiphilic copolymers were carried out by use of a click chemistry reaction to block propargyl polyethylene glycol (propargyl-PEG) to terminally azide poly(-caprolactone) (PCL-N-3). For this purpose, propargyl-PEG was synthesized by the reaction of PEGs (3000Da, 2000Da, 1500Da, and 1000Da) and propargyl chloride. Terminally chloride poly(-caprolactone) (PCL-Cl) was carried out by means of ring-opening polymerization (ROP) of -caprolactone (CL) and 3-chloro-1,2-propanediol. Synthesis of PCL-N-3 was obtained by the chemical interaction of PCL-Cl and sodium azide. By reacting propargyl-PEG and PCL-N-3, the star-type amphiphilic copolymers were obtained. The characterization of products was accomplished by using multiple instruments including H-1-NMR, FT-IR, GPC, TGA, contact angles, and elemental analysis techniques.
  • Küçük Resim
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    Synthesis and characterization of the block copolymers using the novel bifunctional initiator by RAFT and FRP technics: evaluation of the primary polymerization parameters
    (Springer, 2020) Ozturk, Temel; Savas, Bedrettin; Meyvaci, Ergul; Kılıclıoğlu, Ali; Hazer, Baki
    Synthesis of poly(styrene-b-methyl methacrylate) block copolymers were obtained via reversible addition-fragmentation chain transfer (RAFT) polymerization of styrene using RAFT-macro agent. For this purpose, 4-bromomethyl benzoyl chloride was obtained using 4-methylbenzoyl chloride and N-bromosuccinimide. The mono functional bromomethyl benzoyl t-butyl peroxy ester (t-BuBP) was obtained by reaction of 4-bromomethyl benzoyl chloride with t-butyl hydroperoxide. Terminally brominated poly(methyl methacrylate) (PMMA-Br) was synthesized using t-BuBP and methyl methacrylate via free-radical polymerization. RAFT-macro agent was acquired by reaction of PMMA-Br and potassium ethyl xanthogenate. By reacting RAFT-macro agent and styrene, block copolymers were obtained. The primary parameters, for example concentration, and time that affect reaction were evaluated. The products were characterized by FT-IR, H-1-NMR, GPC, and TGA. The multi instruments studies of the obtained block copolymers show that the copolymers easily formed as a result of RAFT. Mn,GPC values of the copolymers were between 24,900 g.mol(-1) and 74,100 g.mol(-1).