Person:
ÇAKMAKÇI, EMRAH

Profile Picture

Email Address

Birth Date

Research Projects

Organizational Units

OrgUnit Logo
Organizational Unit

Job Title

Last Name

ÇAKMAKÇI

First Name

EMRAH

Name

Filters

2011 - 20134
Reset filters

Settings

Subject: PHOTOPOLYMERIZATION ×

Search Results

Now showing 1 - 4 of 4
  • No Thumbnail Available
    PublicationMetadata only
    Properties of Thiol-ene Photocurable Highly Hydrophobic and Oleophobic Nanocomposite Coatings on ABS and HIPS Substrates
    (WILEY-HINDAWI, 2013) ÇAKMAKÇI, EMRAH; Mulazim, Yusuf; Cakmakci, Emrah; Kahraman, Memet V.
    In this study, thiolene photocurable highly hydrophobic and oleophobic coatings were prepared and characterized. Trimethylolpropane tris(3-mercaptopropionate) and triallyl 1,3,5-triazine-2,4,6(1H,3H,5H)-trione were used for the preparation of the base formulation. Highly hydrophobic and oleophobic coatings were prepared with the aid of a fluorinated acrylate (Fluowet AC 812) and hydrophobic-fumed nanosilica particles. Nanoparticles were added for increasing the surface roughness and also to increase thermal and mechanical properties of the coatings. Coatings were applied on ABS (acrylonitrilebutadienestyrene) and HIPS (high impact polystyrene) substrates. As the fluorine and nanosilica contents were increased in the formulations, flame retardancy, hydrophobicity, and the oleophobicity of the coatings increased. Coatings were found to be highly thermally stable, highly solvent, and chemically resistant. The surface roughness of the coatings increased with the addition of hydrophobic-fumed nanosilica particles. In addition, the relation between the surface energy and the contact angle of the coatings was investigated. (c) 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E416E426, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21289
  • No Thumbnail Available
    PublicationMetadata only
    Preparation and characterization of boron containing thiol-ene photocured hybrid coatings
    (ELSEVIER SCIENCE SA, 2012) ÇAKMAKÇI, EMRAH; Cakmakci, Emrah; Mulazim, Yusuf; Kahraman, Memet Vezir; Apohan, Nilhan Kayaman
    In this study, flame retardant, 4-vinylphenyl boronic acid containing coatings were prepared by thiol-ene polymerization. The photopolymerization kinetics of thiol-ene based formulations was investigated by real time infrared spectroscopy. The experiments showed that as the amount of boronic acid was increased, flame retardant properties of the coatings were also increased. Tensile test results showed that boronic acid groups strengthened the polymeric network. DSC results revealed that the addition of thiol causes Tg values of the coatings to decrease. On the other hand acid groups improved the hydrophilicity of the coatings. (C) 2012 Elsevier B.V. All rights reserved.
  • No Thumbnail Available
    PublicationMetadata only
    Alpha-Amylase Immobilization on Epoxy Containing Thiol-Ene Photocurable Materials
    (KOREAN SOC MICROBIOLOGY & BIOTECHNOLOGY, 2013) ÇAKMAKÇI, EMRAH; Cakmakci, Emrah; Danis, Ozkan; Demir, Serap; Mulazim, Yusuf; Kahraman, Memet Vezir
    Thiol-ene polymerization is a versatile tool for several applications. Here we report the preparation of epoxide groups containing thiol-ene photocurable polymeric support and the covalent immobilization of alpha-amylase onto these polymeric materials. The morphology of the polymeric support was characterized by scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) coupled with SEM was used to explore the chemical composition. The polymeric support and the immobilization of the enzyme were characterized by FTIR analysis. SEM-EDS and FTIR results showed that the enzyme was successfully covalently attached to the polymeric support. The immobilization efficiency and enzyme activity of alpha-amylase were examined at various pH (5.0-8.0) and temperature (30-80 degrees C) values. The storage stability and reusability of immobilized alpha-amylase were investigated. The immobilization yield was 276 +/- 1.6 mg per gram of polymeric support. Enzyme assays demonstrated that the immobilized enzyme exhibited better thermostability than the free one. The storage stability and reusability were improved by the immobilization on this enzyme support. Free enzyme lost its activity completely within 15 days. On the other hand, the immobilized enzyme retained 86.7% of its activity after 30 days. These results confirm that alpha-amylase was successfully immobilized and gained a more stable character compared with the free one.
  • No Thumbnail Available
    PublicationMetadata only
    Flame retardant thiol-ene photocured coatings
    (ELSEVIER, 2011) ÇAKMAKÇI, EMRAH; Cakmakci, Emrah; Mulazim, Yusuf; Kahraman, Memet Vezir; Apohan, Nilhan Kayaman
    The low polymerization tendency of allyl compounds can be enhanced by thiol-ene polymerization systems. In this study. allyldiphenyl phosphine oxide (ADPPO) containing thiol-ene based photocured coatings were prepared with the aim to improve their final thermal and flame retardant properties. The photopolymerization kinetics of thiol-ene based formulations were investigated by real-time infrared spectroscopy. The incorporation of ADPPO into the polymer chains was confirmed by monitoring the conversion of acrylate double bonds and measuring the gel content of the crosslinked films. The experiments showed that as the amount of ADPPO was increased, thermal and flame retardant properties of the coatings were also increased. (C) 2010 Elsevier Ltd. All rights reserved.