Surface Characteristics and Physicochemical Properties of Polystyrene-b-Poly(Acrylic Acid) Determined by Inverse Gas Chromatography

Yazıcı, Özlem

doi:10.1007/s10337-015-3004-x

Cited by 11 publications

(10 citation statements)

References 32 publications

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“…The net retention volume, V N , was determined using 21–23

V_{N} = Q J_{3}^{2} ((), t_{R} - t_{A}) T / ((), T_{f}),

where t A is the retention time of the air through the column and t R is the retention time of the injected probe, Q is volumetric flow rate measured at column outlet at ambient temperature T f (K),

J_{3}^{2}

is James–Martin compression correction factor, and T is the column temperature. Gibbs free energy of adsorption ( ∆G A ) as given by 14,24

∆ G_{A} = - italicRT \ln ((), V_{N}) + K .

where R is the universal gas constant and K is a constant.…”

Section: Inverse Gas Chromatography Theorymentioning

confidence: 99%

Synthesis and thermodynamic characterization of poly(methyl methacrylate)/multiwall carbon nanotube nanocomposite

Çakar

2020

Surface & Interface Analysis

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In the first part of this study, poly(methyl methacrylate) (PMMA)/multiwall carbon nanotube (MWCNT) nanocomposite was synthesized by adding carbon nanotube before polymerization with bulk polymerization. Surface morphology of the PMMA/MWCNT nanocomposite and the PMMA/MWCNT nanocomposite with Chromosorb W was characterized by scanning electron microscopy (SEM). Surface and thermodynamic properties of the PMMA/MWCNT nanocomposite were investigated by inverse gas chromatography (IGC). The surface acid base character and dispersed surface energy γSD of the PMMA/MWCNT were determined at infinite dilution. The entropy of adsorption, ∆SS, the specific free energy of adsorption, ∆GS, and the enthalpy of adsorption, ∆HS, of selected polar solvents were determined on the PMMA/MWCNT nanocomposite. The values of ∆HS were correlated with both the acceptor and donor numbers of the solvents to determine the Lewis acidic constant KA and the Lewis basic constant KD of the PMMA/MWCNT nanocomposite. The PMMA/MWCNT nanocomposite selectivity was investigated using the acetate and alcohol isomers by IGC at temperatures between 393.2 and 403.2 K. Glass transition temperature (Tg) was determined using differential scanning calorimetry (DSC) and IGC method. The interactions between the PMMA/MWCNT nanocomposite and 12 solvents were propped at a temperature range (423.2–448.2 K). The Flory–Huggins interaction parameter, χ12∞, and the weight fraction activity coefficient, 0.25emΩ1∞, of the PMMA/MWCNT nanocomposite solvent system were estimated at temperatures between 423.2 and 448.2 K. The solubility parameter of the PMMA/MWCNT nanocomposite, δ2, was calculated as 14.0 (cal/cm3)1/2.

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“…The net retention volume, V N , was determined using 21–23

V_{N} = Q J_{3}^{2} ((), t_{R} - t_{A}) T / ((), T_{f}),

where t A is the retention time of the air through the column and t R is the retention time of the injected probe, Q is volumetric flow rate measured at column outlet at ambient temperature T f (K),

J_{3}^{2}

is James–Martin compression correction factor, and T is the column temperature. Gibbs free energy of adsorption ( ∆G A ) as given by 14,24

∆ G_{A} = - italicRT \ln ((), V_{N}) + K .

where R is the universal gas constant and K is a constant.…”

Section: Inverse Gas Chromatography Theorymentioning

confidence: 99%

Synthesis and thermodynamic characterization of poly(methyl methacrylate)/multiwall carbon nanotube nanocomposite

Çakar

2020

Surface & Interface Analysis

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“…In literature, it was possible to find the γ L D values from n-pentane up to n-decane. [33][34][35][36] The rest of the values (all of them displayed in Table 1) were obtained by logarithmic extrapolation of the previous ones. Previously, a linear extrapolation had also tested but the obtained results of the dispersive components of the surface free energy of clinoptilolite were quite different from those of Dorris-Gray method, which has proved to be a more accurate method, 18 although it has the major drawback of not As it can be seen, in the temperature range studied, it is difficult to ascertain the dependence of temperature on the values of γ S D .…”

Section: Dispersive Component Of the Surface Energymentioning

confidence: 99%

Characterization of a natural zeolite with inverse gas chromatography to assess its feasibility as adsorbent

Díez

Gómez

Rodrı́guez

et al. 2020

Env Prog and Sustain Energy

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In this work, the dispersive and specific components of the surface energy of clinoptilolite have been obtained by means of IGC technique with the aim of assessing its potential as adsorbent to remove metallic cations from aqueous solutions. The obtained values of the dispersive component range from 22 to 36 mJ/m2, in agreement with the fact that clinoptilolite removal of metal ions takes place mainly due to physisorption. In relation to acid–base properties, the acidic and basic constants of clinoptilolite were found to be KA = 52.4 and KD = 1.5, indicating that this solid is adequate for the removal of metallic cations from aqueous solutions due its acidic surface character.

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“…Highlighted therein are reviews and original papers published in the journal during the last 2 calendar years. Should you have missed this e-mail, or should our e-mailing have (unforgivably) missed you, our readers can still find out about some of the diverse work published in Chromatographia in 2016 and 2017 in the area of polymer chromatography through the eight papers constituting the virtual issue [1][2][3][4][5][6][7][8].…”

mentioning

confidence: 99%

“…These publications exemplify the range of analytical techniques applicable to macromolecular separations, via original papers dealing with inverse gas chromatography [1], high-temperature multi-detector size-exclusion chromatography (SEC) [4], mass spectrometry and ion mobility separation [3], and asymmetric flow field-flow fractionation [5]; and in reviews dealing with off-line refractometry [7] and with SEC with on-line viscometry, in particular [2], and also covering hyphenated liquid chromatographic polymer analysis methods, in general [6].…”

mentioning

confidence: 99%

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Introducing the Inaugural Chromatographia Virtual Issue: Macromolecular Separations

Striegel

2018

Chromatographia

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Surface Characteristics and Physicochemical Properties of Polystyrene-b-Poly(Acrylic Acid) Determined by Inverse Gas Chromatography

Cited by 11 publications

References 32 publications

Synthesis and thermodynamic characterization of poly(methyl methacrylate)/multiwall carbon nanotube nanocomposite

Synthesis and thermodynamic characterization of poly(methyl methacrylate)/multiwall carbon nanotube nanocomposite

Characterization of a natural zeolite with inverse gas chromatography to assess its feasibility as adsorbent

Introducing the Inaugural Chromatographia Virtual Issue: Macromolecular Separations

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