scholarly journals Surface characterization of polymers by inverse gas chromatography

2007 ◽  
Vol 72 (4) ◽  
pp. 403-406 ◽  
Author(s):  
Aleksandra Nastasovic ◽  
Antonije Onjia
Keyword(s):  
Glycidyl Methacrylate ◽  
Surface Characterization ◽  
Infinite Dilution ◽  
Inverse Gas Chromatography ◽  
Surface Coverage ◽  
Isosteric Heat ◽  
Free Energies ◽  
Acid Base ◽  
Adsorption Energy Distribution

An inverse gas chromatographic (IGC) study of the sorption properties of macroporous crosslinked poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate), PGME, and PGME modified with ethylene diamine, PGME-en, was presented. At infinite dilution, the thermodynamic parameters of adsorption, the dispersive components of the surface free energies, the acid/base constants and the interaction parameters for the initial and modified copolymer samples were investigated. The adsorption isotherms determined by IGC under conditions of finite surface coverage were used to estimate the surface area, the isosteric heat of adsorption and the adsorption energy distribution on the surface of the initial and modified copolymer samples. .

scholarly journals Application of inverse gas chromatography for polymer characterization

2007 ◽  
Vol 61 (6) ◽  
pp. 342-349
Author(s):  
Aleksandra Nastasovic ◽  
Antonije Onjia ◽  
Slobodan Milonjic ◽  
Slobodan Jovanovic
Keyword(s):  
Gas Chromatography ◽  
Ethylene Glycol ◽  
Glycidyl Methacrylate ◽  
Infinite Dilution ◽  
Inverse Gas Chromatography ◽  
Glycol Dimethacrylate ◽  
Free Energies ◽  
Acid Base ◽  
Polymer Characterization ◽  
Suspension Copolymerization

The possibility of polymer characterization by inverse gas chromatography (IGC) was illustrated with the study of sorption properties of macroporous crosslinked poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate), PGME, synthesized by suspension copolymerization, and copolymer modified with ethylene diamine, PGME-en. The data collected from IGC experiments at infinite dilution are used for the calculation of the thermodynamic parameters of adsorption, dispersive components of the surface free energies, and the acid/base constants. .

Characterization of Glycidyl Methacrylate Based Copolymers by Inverse Gas Chromatography under Finite Surface Coverage

2005 ◽  
Vol 290 (9) ◽  
pp. 884-890 ◽  
Author(s):  
Aleksandra B. Nastasović ◽  
Antonije E. Onjia ◽  
Slobodan K. Milonjić ◽  
Zorica M. Vuković ◽  
Slobodan M. Jovanović
Keyword(s):  
Gas Chromatography ◽  
Glycidyl Methacrylate ◽  
Inverse Gas Chromatography ◽  
Surface Coverage

scholarly journals Inverse gas chromatography of chromia. Part I. Zero surface coverage

2001 ◽  
Vol 66 (4) ◽  
pp. 259-271 ◽  
Author(s):  
A.E. Onjia ◽  
S.K. Milonjic ◽  
Lj.V. Rajakovic
Keyword(s):  
Gas Chromatography ◽  
Surface Energy ◽  
Inverse Gas Chromatography ◽  
Surface Coverage ◽  
Crystalline Form ◽  
Free Energies ◽  
Solid Samples ◽  
Acid Base ◽  
Basic Character ◽  
Vapour Mixture

The surface properties of the solid obtained from colloidal chromiawere investigated by inverse gas chromatography (IGC), at zero surface coverage conditions. The solid samples I dried at 423 K and II heated at 1073 K in the amorphous and crystalline form, respectively, were studied in the temperature range 383-423 K. The dispersive components of the surface free energies, enthalpies, entropies, and the acid/base constants for the solidswere calculated from the IGCmeasurements and compared with the data for a commercially available chromia (III). Significantly lower enthalpies and entropies were obtained for cyclohexane on solid II and chloroform, highly polar organic, on solid I. The dispersive contributions to the surface energy of solid II and III were similar, but much greater in the case of solid I. All the sorbents had a basic character, with the KD/KA ratio decreasing in the order I > II > III. The retention and resolution in the separation of a vapour mixture of C5-C8 n-alkanes on the three substrates were different.Arapid separationwas observed on solid II and an enhanced retention on solid I. Generally, the heated chromia (II) exhibited diminished adsorption capacity, and enhanced homogeneity of the surface.

scholarly journals Inverse gas chromatrography of chromia. Part II. Finite surface coverage

2002 ◽  
Vol 67 (3) ◽  
pp. 165-178 ◽  
Author(s):  
Antonije Onjia ◽  
Slobodan Milonjic ◽  
Ljubinka Rajakovic
Keyword(s):  
Inverse Gas Chromatography ◽  
Surface Coverage ◽  
Isosteric Heat ◽  
Strong Acid ◽  
Colloidal Dispersion ◽  
Adsorption Ability ◽  
Base Interaction ◽  
Spreading Pressure ◽  
Adsorption Energy Distribution ◽  
Acid Base Interaction

The interactions of n-hexane, benzene, chloroform, and tetrahydrofuran with dried (amorphous) chromia (I) and chromia heated at 1073 K (crystalline) (II), both obtained from a colloidal dispersion, and a commercially available chromia (III) were studied by inverse gas chromatography (IGC) under finite surface coverage conditions. The isotherms, in the temperature range 383 ? 423 K, were used to estimate the surface area, the adsorption energy distribution, the isosteric heat of adsorption, and the spreading pressure on the surfaces of the solids. The uniformly reduced adsorption ability of the heated chromia was attributed to the dehydroxylation of the surface at the higher temperatures. Both solids showed an increased affinity toward chloroform molecules, as a result of strong acid-base interaction.

scholarly journals Surface characterization of 1-butyl-1-ethylpiperidinium bromide by inverse gas chromatography

2019 ◽  
Vol 287 ◽  
pp. 110945
Author(s):  
Stella K. Papadopoulou ◽  
Nicolas Papaiconomou ◽  
Stéphane Baup ◽  
Cristina Iojoiu ◽  
Lenka Svecova ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Surface Characterization ◽  
Inverse Gas Chromatography

Surface characterization of alumina-supported catalysts prepared by sol–gel method. Part I. Acid–base properties

2001 ◽  
Vol 3 (7) ◽  
pp. 1366-1370 ◽  
Author(s):  
Masaaki Haneda ◽  
c Emmanuel Joubert ◽  
Jean-Christophe Me´ne´zo ◽  
Daniel Duprez ◽  
Jacques Barbier ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Supported Catalysts ◽  
Sol Gel ◽  
Acid Base ◽  
Gel Method ◽  
Sol Gel Method ◽  
Base Properties
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