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RISS 인기검색어
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- 저자 : Nilhan Kayaman Apohan (검색결과 2 건)
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Emine Arman Kandirmaz,Efe N. Gençoğlu,Nilhan Kayaman Apohan 한국고분자학회 2019 Macromolecular Research Vol.27 No.8
Polymeric photoinitiators are widely used in ultraviolet (UV)-curable printing inks because of their low migration behavior. In this study, a new phenylphosphine oxide-polystyrene-thioxanthone (PPO-PSt-TX) polymeric photoinitiator was synthesized. Bis[(4-hydroxy)phenyl]phenyl phosphine oxide (BHPPO) that was synthesized by Grignard technique, was functionalized with 2-bromopropionyl bromide (atom transfer radical polymerization (ATRP) initiator) and then used in styrene polymerization. The bromine end-capped polystyrene was then reacted with 2-thioxanthone-thioacetic acid and final polymeric photoinitiator PPO-PSt-TX was obtained. Proton nuclear magnetic resonance (1H NMR), attenuated total reflectance- Fourier transform infrared spectroscopy (ATR-FTIR), gel permeation chromatography (GPC) and ultraviolet-visible spectroscopy (UV-Vis) confirmed the obtained structure. The curing characteristic of PPO-PSt-TX was compared with a standard flexographic printing varnish formulation containing thioxanthone (TX). The photopolymerization kinetics were determined by photo differential scanning calorimetry (Photo-DSC). The conversion of methylmethacrylate polymerization by using macrophotoinitiator is 78%. The migration behavior of PPO-PSt-TX was identified with liquid chromatography-mass spectrometry (LC-MS). It was shown that PPOPSt- TX macro photoinitiator is suitable for flexographic varnish and the migration level of photoinitiator is reduced by using polymeric photoinitiator.
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Vegetable oil-based epoxy coating materials for self-healing and anticorrosive applications
Burcu Oktay,Jülide Hazal Türkcan,Oğuz Kaan Özdemir,Nilhan Kayaman‑Apohan 한국고분자학회 2023 Macromolecular Research Vol.31 No.11
A new bio-based epoxy curing agent from hempseed oil was prepared in this study. The chemical structure of the curing agent was confirmed by infrared spectrometry and nuclear magnetic resonance. Soybean oil-based epoxy resin was cured with a hempseed oil-based green curing agent to prepare a series of sustainable coatings under eco-friendly conditions. The reaction of epoxy resin with anhydride groups reacted without a catalyst. The prepared sustainable coatings showed excellent scratching and adhesion resistance. In addition, the coating showed self-healing properties via dynamic transesterification bonds between the epoxy and anhydride groups. The corrosion resistance of the sustainable coatings is investigated using electrochemical measurements. It revealed that the materials have strong anti-corrosion performance. Hence, these coatings can be used as a green alternative for encapsulation-based corrosion protection systems. Furthermore, the produced materials could be used as a VOC-free coating system.
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