Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Author: search.filters.author.Wegner, GerhardPublisher: search.filters.publisher.John Wiley and Sons Inc.

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Now showing 1 - 3 of 3
  • Article
    Citation - WoS: 42
    Citation - Scopus: 43
    Investigation of Oxygen Permeation Through Composites of Pmma and Surface-Modified Zno Nanoparticles
    (John Wiley and Sons Inc., 2009) Hess, Sandra; Demir, Mustafa Muammer; Yakutkin, Vladimir; Baluschev, Stanislav; Wegner, Gerhard; 03.09. Department of Materials Science and Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Oxygen permeabilities of nanocomposite films consisting of poly(methyl methacrylate) (PMMA) and different amounts of spherical zinc oxide (ZnO) nanoparticles were determined to investigate the barrier effect of this material with respect to particle content. A method was applied which is based on quenching of an excited phosphorescent dye by oxygen. Possible effects of the nanoparticles on the response of the dye molecules were investigated and were ruled out.
  • Article
    Citation - WoS: 185
    Pmma/Zinc Oxide Nanocomposites Prepared by In-Situ Bulk Polymerization
    (John Wiley and Sons Inc., 2006) Demir, Mustafa Muammer; Demir, Mustafa Muammer; Castignolles, Patrice; Wegner, Gerhard; 03.09. Department of Materials Science and Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Dispersing surface-modified zinc oxide nano-particles (ZnO) in methyl methacrylate (MMA) improves the free radical bulk polymerization process as well as the thermal stability of the formed polymer. Hydroxy groups available on the ZnO surface may induce a degenerative transfer. This suppresses the gel effect, which leads to a better control of the heat evolution during the late stages of polymerization. The formation of chains having vinylidene end groups and head-to-head links is suppressed, which shifts the onset of thermal decomposition to the regime where decomposition occurs by random chain scission.
  • Article
    Citation - WoS: 51
    Citation - Scopus: 53
    Challenges in the Preparation of Optical Polymer Composites With Nanosized Pigment Particles: a Review on Recent Efforts
    (John Wiley and Sons Inc., 2012) Demir, Mustafa Muammer; Demir, Mustafa Muammer; 03.09. Department of Materials Science and Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Blends of nanosized pigment particles and polymers are widely believed to offer the potential for the design of novel or at least improved materials. This review critically evaluates the recent literature with regard to the following issues: (a) why and how does the size of the particles matter, (b) what are the requirements to create compatibility between amorphous polymers and nanoparticles, (c) carbon allotropes as nanosized pigments, (d) bulk polymerization of monomer/pigment mixtures, (e) interaction of growing chains with the particles in the polymerization, (f) depletion flocculation as a mechanism to counteract homogeneous distribution of the particles in the polymer matrix and ways to suppress the undesirable flocculation, and (g) optical properties of the blends as well as methods of optical characterization.