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    The preparation and applications of novel phosphazene crosslinked thermo and pH responsive hydrogels
    (Elsevier Science Inc, 2016) Ozay, Hava; Sahin, Ozdem; Koc, Omer Kaan; Özay, Özgür
    In this study, we synthesized a novel phosphazene compound hexakis[4-(acrylamido)phenoxy] cyclotriphosphazene (HAAP) as crosslinker. The structure of compound was identified using spectroscopic techniques. Then, HAAP was used as crosslinker for the synthesis of thermo and pH responsive p(NIPAM-co-VI) hydrogels. The structure and swelling behavior of hydrogel was investigated. Then, HAAP-crosslinked p(NIPAM-co-VI) hydrogels were used for in vitro release of Rhodamine 6G as drug release matrix. Additionally, HAAP-crosslinked p(NIPAM-co-VI) hydrogels were used as support material for the preparation of cobalt metal catalysts. The prepared HAAP-crosslinked p(NIPAM-co-VI)Co composite catalyst was used as catalyst for the reduction reaction of 4-nitrophenol. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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    The Preparation of Phosphazene Crosslinked Cyclen Microspheres as Host for Cu2+ Ions and Their Utilization as a Support Material for the Preparation of a Copper Nanocatalyst
    (Springer, 2017) Sahin, Ozdem; Koc, Omer Kaan; Ozay, Hava; Özay, Özgür
    In this study firstly, phosphazene crosslinked cyclen microspheres were synthesized. Then, supported copper nanoparticles were prepared on these phosphazene crosslinked cyclen microspheres for use as a metal catalyst. The prepared microparticles and microparticle-supported metal catalyst were characterized using FT-IR, SEM-EDX, TEM and XPS analysis. Also, the prepared metal composite was used as a catalyst for the reduction reaction of 4-nitrophenol in the presence of NaBH4 in aqueous media. The catalytic activity of the Cu-cyclen composite catalyst was investigated using UV-Vis spectroscopy. The reduction studies were completed at four different temperatures (30-60 A degrees C). The activation parameters were calculated from the obtained rate constants at the four different temperatures (30-60 A degrees C). The activation energy, activation enthalpy and activation entropy for the reduction reaction of 4-NP in the presence of Cu-cyclen composite catalyst were calculated as 39.88, 36.56 and -143.30 kJmol(-1), respectively. The total turnover frequency (TOF) for Cu-cyclen composite catalyst was 0.794 mol 4-NP (mol Cu)(-1) (min)(-1).