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    Wyświetlanie 1-4 z 4
    Tytuł:
    Investigation into the surface properties of papers sized with styrene-acrylate-cationic monomer based terpolymers
    Autorzy:
    Özdemir, M.
    Aytaç, A.
    Deniz, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050997.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.47.Pe
    82.35.-x
    Opis:
    In this study, styrene(St)/2-ethyl hexyl acrylate(2-EHA) based surface sizing materials were developed with four different cationic monomers (CM), namely diallyldimethyl ammonium chloride (DADMAC), [2-(methacryloyloxy) ethyl] trimethylammonium chloride (MATMAC), [3-(methacryloylamino) propyl]-trimethyl ammonium chloride (MAPTAC), (viniylbenzyl) trimethyl-ammonium chloride (VBTMAC). Ternary polymerization was realized with emulsion polymerization, by using 2,2'-azobis (2-methylpropionamidine) dihydrochloride (A) as initiator. Thermal properties of the synthesized terpolymers were determined with differential scanning calorimeter and thermal gravimetric analysis. Differential scanning calorimeter results showed that glass transition temperature (T_{g}) values of polymers were not dependent on the types of cationic monomers, and were found about 44-45°C. Ion exchange capacities of the terpolymers were determined. The latexes produced were used as sizing materials for paper surface treatment. Then critical surface properties of the papers sized such as water resistance (Cobb value) and contact angle were measured. It was found that the best, i.e. the lowest Cobb results were obtained when MATMAC and MAPTAC cationic monomers were used in terpolymers.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 178-181
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of the Nanoclay and Intumescent System on the Properties of the Plasticized Polylactic Acid
    Autorzy:
    Hazer, S.
    Coban, M.
    Aytac, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031565.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.lg
    81.05.qk
    82.35.np
    Opis:
    The aim of this study is the investigation of the effects of an intumescent system, consisting of ammonium polyphosphate (APP), as a flame retardant additive, pentaerythritol (PER), as a carbonic agent, and nanoclay, as a synergistic agent, on the flame retardancy of plasticized poly(lactic acid) (PLA). In accordance with this purpose, plasticized and flame retarded PLA with APP compound was prepared and used as a control sample. Nanoclay loading levels were changed between 3 and 10 wt.% in the PLA/APP/PER samples. Samples were produced using extrusion and injection molding techniques. The morphological, thermal, mechanical and flammability properties were studied. The flammability evaluation was performed using limiting oxygen index and vertical burning (UL-94) tests. The obtained limiting oxygen index value was up to 32.9 and UL-94 grade could pass V-0 for samples, containing 3 wt.% of nanoclay. However, increasing nanoclay amount has enhanced the burning time of the sample. The thermal behaviors of the samples were characterized by differential scanning calorimetry. It was shown, that PER incorporation did not significantly change the percentage crystallinity value. The increasing nanoclay loading levels reduced the degree of crystallization. Elongation at break value of sample, containing 5 wt.% of nanoclay, increased by 28%, compared to the control sample.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 634-637
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of the Properties of Paper Sized with Styrene-Butyl Acrylate Copolymers
    Autorzy:
    Özdemir, M.
    Özdemir Alp, M.
    Aytaç, A.
    Deniz, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031427.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.bm
    68.47.Mn
    81.05.Qk
    Opis:
    In this study, styrene 70 wt.%-butyl acrylate 30 wt.% copolymer-based surface-sizing materials were synthesized using semi-batch emulsion polymerization and applied on the paper. Four different emulsifiers, with different ethylene oxide numbers, at ratios of 10%, 7% and (2, 2'-azobis (2-methylpropionamidine) dihydrochloride (A)) as initiator were used for emulsion polymerization. Eight different copolymers were synthesized. Synthesized copolymers were used as surface sizing agents for the paper surface. Ion exchange capacity, pH, Fourier transform infrared spectroscopy, differential scanning calorimetry and thermal gravimetric analysis were used for the characterization of the copolymer properties. Contact angle measurements, Cobb test, and scanning electron microscopy analysis were carried out to determine the surface properties of the paper samples. Presence of copolymer formations was proven with the Fourier transform infrared analysis. Contact angle measurements of the copolymer sized paper surface have shown hydrophobic behaviour in samples, with the exception of E-3/7/A sample. The lowest Cobb value was observed for E-2/7/A sample. The highest thermal stability was also observed for E-2/7/A sample. The scanning electron micrographs show that the paper loses its fibrous structure and it is seen that the copolymer adheres to the fibrous tissue.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1098-1101
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE CONTEMPORARY CONCEPT OF E-GOVERNMENT AND THE CASE OF TURKEY: POSSIBLE CHALLENGES AND THE E-TRANSFORMATION TURKEY PROJECT
    Autorzy:
    Gökmen, Aytaç
    Hamsıoglu, A. Bugra
    Powiązania:
    https://bibliotekanauki.pl/articles/450550.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego
    Tematy:
    E-Government
    ICT
    Implementation
    Information
    E-Transformation
    Turkey
    Opis:
    Globalization is the process of transforming regional or local developments and phenomena into global realities. Globalization is also a process that unifies the world into a single society which is a combination of economical, social, political and technological influences. The most substantial actor in this process is the Internet and its contributions to data and knowledge procurement among the states, legal and natural persons. Moreover, Turkey is one of the leading nations in the world to encourage the use of Internet and e-government implementations to integrate Turkey with rest of the world and render premium services to her citizens and other related entities. The e-government which is also known as e-gov, online government or digital government, is a concept to utilize the Internet technology as a means to exchange information, provide services and transactions with citizens, business and other branches of government. Some e-government implementations both in practice and forthcoming in Turkey are e-Government Gateway, Public Sector Network, Information Disaster Recover System and Justice Net. It is aimed to constitute and develop knowledge society; to facilitate access to knowledge, decrease time consumption, provide better access to public services and enhance efficiency, ensure transparency and accountability, lower the costs and save sources in Turkey by e- government regulations. The aim of this study is to reveal the developments and realities of e-government in Turkey with respect to the ETransformation Turkey Project theoretically depending on comprehensive and credible, international and national publications.
    Źródło:
    International Journal of Emerging and Transition Economies (IJETE); 2010, 3, 2; 249-268
    1308-2701
    Pojawia się w:
    International Journal of Emerging and Transition Economies (IJETE)
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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