Person: TEMEL, BİNNUR
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Publication Metadata only Preparation of single chain nanoparticles via photoinduced radical coupling process(2019-04-01) Dashan, Irem; Balta, Demet Karaca; Temel, BİNNUR; Temel, Gokhan; TEMEL, BİNNURThis contribution introduces a straightforward method for preparing well-defined polymeric nanoparticles using radical coupling process of ketyl moieties resulted from triplet excitation of pendant benzophenone groups. In the first step, poly(styrene-co-chloromethylstyrene) is synthesized by thermally initiated controlled radical co-polymerization technique and subsequently, pendant chloride groups undergo post-modification with 4-hydroxybenzophenone. Achieved well-defined side-chain benzophenone containing copolymers generate ketyl radicals in the presence of excess hydrogen donor molecule upon UV-light irradiation and intramolecularly crosslinked nanoparticles are formed by radical coupling process in dilute regime. Resulting single chain nanoparticles and intermediates are characterized by H-1 NMR, gel permeation chromatography, differential scanning calorimetry, UV-Vis spectrometry and electron microscopy techniques.Publication Metadata only Versatile light-responsive organogels: Evaluation of their dye releasing and photoinitiation behaviors(2019-06-15) Dashan, Irem; Elverici, Melisa; Balta, Demet Karaca; Temel, BİNNUR; Temel, Gokhan; TEMEL, BİNNURLight-responsive crosslinked structures were prepared by a straightforward quaternization strategy using chloride functional polystyrene copolymers and commercially available Michler-s ketone with varying feed ratios. Resulting organogels demonstrated excellent solvent absorption and their swelling characteristics were altered by UV-light irradiation. According to scanning electron microscope images, UV-illuminated samples showed an obvious photodecomposition, which enhanced their solvent uptake capacity with increase of UV exposure. Additionally, release behavior of eosin Y as a model compound was determined by UV-vis and fluorescence spectrometers. Achieved photoactive gels were also employed as the reusable heterogeneous initiators for photoinduced free-radical polymerization of methyl methacrylate. (c) 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1275-1282Publication Metadata only Preparation of Single Chain Nanoparticles via Photoinduced Double Collapse Process(2019-05-01T00:00:00Z) Dashan, Irem; Balta, Demet Karaca; Temel, Binnur Aydogan; Temel, Gokhan; TEMEL, BİNNURA straightforward method is described to achieve polymeric nanoparticles by double folding of single linear chains. The side chain functional polystyrene with controlled molecular weight is converted to pendant azide and benzophenone motifs via postmodification reactions. Resulting functionalized chains undergo intramolecular crosslinking upon ultraviolet (UV) illumination using simultaneous and subsequent pathways at a dilute concentration. Particle size of nanoparticles can be tuned by changing the degree of crosslinking using a second folding process. Obtained single and double collapsed chains indicate higher glass transition temperatures and lower hydrodynamic radii compared to their intermediates. To our knowledge, the combination of photoinduced azide crosslinking and radical coupling processes is the first attempt to prepare double folding single polymer chains.