Researcher:
Burgaz, Engin

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Undergraduate Student

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Engin

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Burgaz

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Burgaz, Engin

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1999 - 20003

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Researcher Of Publications: search.filters.isAuthorOfPublication.ae6493a5-e2e3-4d35-afe9-d7e6405494e2

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    Influence of competitive hydrogen bonding between hard and soft segments on the properties of siloxane and polyether-based segmented copolymers.
    (Amer Chemical Soc, 1999) Department of Chemistry; Department of Chemistry; N/A; Yılgör, İskender; Burgaz, Engin; Metin, Burak; Yurtsever, İsmail Ersin; Yılgör, Emel; Faculty Member; Undergraduate Student; Undergraduate Student; Faculty Member; Researcher; Department of Chemistry; College of Sciences; College of Sciences; N/A; 24181; 17956; N/A; N/A; 40527
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    Comparison of hydrogen bonding in polydimethylsiloxane and polyether based urethane and urea copolymers
    (Elsevier, 2000) Department of Chemistry; Department of Chemistry; Department of Chemistry; Department of Chemistry; Yılgör, Emel; Burgaz, Engin; Yurtsever, İsmail Ersin; Yılgör, İskender; Researcher; Undergraduate Student; Faculty Member; Faculty Member; Department of Chemistry; College of Sciences; College of Sciences; College of Sciences; College of Sciences; 40527; N/A; 7129; 24181
    Hydrogen bonding in polydimethylsiloxane and polyether based urethane and urea type segmented copolymers was investigated by infrared spectroscopy, differential scanning calorimetry and quantum mechanical calculations. Hydrogen bonding in model urethane and urea compounds was compared with those of the copolymers, in order to determine the extent of interaction and resulting phase mixing between hard and soft segments in these copolymers. Quantum mechanical calculations were also used to determine the interaction energies due to hydrogen bonding in model urethane and urea compounds. Further, similar calculations were also performed to quantify the interactions between silicone and ether type soft segments, and urea and urethane type hard segments. As expected, these calculations clearly indicated the absence of any interaction between silicones and urea groups, while there was substantial hydrogen bonding between urea groups and the oxygen in the ether type soft segments. Results of FTIR studies and quantum mechanical calculations were in good agreement with thermomechanical behavior and mechanical properties of these copolymers.
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    Influence of competitive hydrogen bonding between hard and soft segments on the properties of siloxane and polyether based segmented copolymers
    (American Chemical Society (ACS), 1999) Department of Chemistry; Department of Chemistry; Department of Chemistry; Department of Chemistry; Department of Chemistry; Yılgör, Emel; Yılgör, İskender; Yurtsever, İsmail Ersin; Metin, Burak; Burgaz, Engin; Reseacher; Faculty Member; Faculyt Member; Undergraduate Student; Undergraduate Student; Department of Chemistry; College of Sciences; College of Sciences; College of Sciences; College of Sciences; College of Sciences; 40527; 24181; 7129; N/A; 17956
    Quantitative information on hydrogen bonding in urethane and urea type segmented copolymers were obtained through experiments and complementary quantum mechanical calculations. Polymers based on polydimethylsiloxane (PDMS) and polyethers with uniform hard segments were prepared and characterized by FTIR spectroscopy, thermal analysis and stress-strain tests. In addition, quantum mechanical calculations were also performed in determining the extent of intermolecular hydrogen bonding between model compounds. These were achieved by calculating the changes in the enthalpy of formation due to attractive interactions along the minimum energy paths between model molecules.