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Surface characteristics of 2‐(diethylamino) ethyl methacrylate–2‐(dimethylamino) ethyl methacrylate diblock copolymer determined by inverse gas chromatography
Author(s) -
Topaloğlu Yazıcı D.,
Aşkın A.,
Bütün V.
Publication year - 2006
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2226
Subject(s) - inverse gas chromatography , copolymer , methacrylate , adsorption , surface energy , enthalpy , polymer chemistry , polymer , standard molar entropy , contact angle , materials science , chemistry , thermodynamics , composite material , physics
The surface characterization of a 2‐(diethylamino) ethyl methacrylate–2‐(dimethylamino) ethyl methacrylate diblock copolymer [DEA‐DMA] was carried out using inverse gas chromatography (IGC). The adsorption thermodynamic parameters (the standard enthalpy (Δ H o ), entropy (Δ S o ), and free energy of adsorption (Δ G o )), the dispersive component of the surface energy ( $\gamma_{S}^{d}$ ), and the acid–base character of the surface of the block copolymer were estimated using the retention time of different nonpolar and polar probes at infinite dilution region. This block copolymer showed convenient values of dispersive surface energy as compared to conventional polymers. The specific free energy of adsorption (Δ G sp ), the specific enthalpy of adsorption (Δ H sp ), and the specific entropy of adsorption (Δ S sp ) of polar probes on diblock copolymer were determined. The values of the Δ H sp were correlated with both the donor and the modified acceptor numbers of the probes to quantify the acidic K A and the basic K D parameters of the block copolymer surface. The values obtained for the K A and K D parameters indicated a basic character for the surface of the DEA‐DMA diblock copolymer. Copyright © 2006 John Wiley & Sons, Ltd.