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.Böke, HasanInstitution Author: search.filters.institutionAuthor.Kaplan, Zişan

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Now showing 1 - 2 of 2
  • Article
    Citation - WoS: 20
    Citation - Scopus: 21
    Long Term Stability of Biodegradable Polymers on Building Limestone
    (Elsevier Ltd., 2019) Kaplan, Zişan; Böke, Hasan; Böke, Hasan; İpekoğlu, Başak; Sofuoğlu, Aysun; Sofuoğlu, Aysun; İpekoğlu, Başak; 02.01. Department of Conservation and Restoration of Cultural Heritage; 03.02. Department of Chemical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology; 02. Faculty of Architecture
    Synthetic polymers can be replaced by biodegradable ones as adhesives, water repellents and consolidants on the stone surfaces and facades of the historic buildings in their conservation to minimize future deterioration. In this study, the long-term stability of two biodegradable polymers, polyhydroxybutyrate (PHB) and poly-L-lactide (PLA), and an acrylic polymer (Paraloid B72) which is commonly used in conservation works of artefacts, were evaluated on limestone using a UV lamp-weathering chamber (up to 104 days) for future protection studies. Chemical and morphological changes induced by an accelerated weathering test were examined by Fourier Transform Infrared spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) analyses. Protection efficiency of the polymers was determined by the changes in color, capillary water absorption, static contact angle on limestone. Paraloid B72, PHB, and PLA coatings significantly increased hydrophobicity while decreasing capillarity water absorption and caused negligible change in the color of the limestone. Protection efficiencies of PLA and PHB polymers were almost the same as that of Paraloid B72, a widely used acrylic polymer. However, PLA and PHB seemed to be favorable polymers as protective agents due to their reversibility and biodegradability, low chromatic changes, good hydrophobic behavior and good stability to weathering in reducing the effects of outdoor exposure on limestone surfaces.
  • Article
    Citation - WoS: 9
    Citation - Scopus: 10
    Physicochemical Properties of Glass Tesserae in Roman Terrace House From Ancient Antandros (base Glass, Opacifiers and Colorants)
    (Ege Üniversitesi, 2017) Kaplan, Zişan; Böke, Hasan; İpekoğlu, Başak; İpekoğlu, Başak; Böke, Hasan; 02.01. Department of Conservation and Restoration of Cultural Heritage; 02. Faculty of Architecture; 01. Izmir Institute of Technology
    In this study, material characteristics of glass mosaic tesserae from Antandros ancient city, western Turkey, were investigated. The main objective of this study was to determine the compositional group of the glass tesserae. Their color, mineralogical, chemical and microstructural characteristics were determined using colorimeter, x-ray diffraction, x-ray fluorescence and scanning electron microscope. The results show that all the Antandros glasses were produced by using coastal sand as Levantine I glasses and exhibit similar compositions with natron type glasses (Roman type glasses), except for lower natron levels. Lower natron levels indicate that Antandros mosaic glass may have been produced in 7th century AD or natron may have been provided from a new flux source due to the shortage of Egyptian mineral soda or due to economic reasons glass manufacturers succeeded to produce same glass with low flux addition. Antandros glass tesserae were all opacified with antimony oxides and colored with transition metal oxides which are common used in Roman Period.