New approach to characterise physicochemical properties of solid substrates by inverse gas chromatography at infinite dilution

Hamieh, Tayssir; Schultz, J.

doi:10.1016/s0021-9673(02)00368-0

Cited by 79 publications

(75 citation statements)

References 24 publications

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“…Although the adsorbed polymer layers are likely to be non homogeneous over the total thickness. The acid-base properties (K A and K D ) of PMMA adsorbed on alumina and silica for various surface recovery rates h were also determined [45][46][47][48][49][50].…”

Section: Methodsmentioning

confidence: 99%

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

2011

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Inverse gas chromatography (IGC) at infinite dilution is a powerful technique to characterize the superficial and interfacial properties of solid substrates as oxides, polymers or polymers adsorbed on oxides. It can also be used to determine the physicochemical properties and the transition phenomena of polymers. In this paper, IGC was used to determine the changes, as a function of temperature, of the specific free enthalpy DG a SP and deduce the specific entropy DS a SP of poly (methyl methacrylate) (PMMA) adsorbed on alumina or on silica for different tacticities of PMMA. The study of the surface properties of PMMA/SiO 2 and PMMA/Al 2 O 3 , revealed an important difference in the physicochemical behaviour of oxides covered by various concentrations of PMMA. This study also highlighted an important effect of the tacticity of the polymer on the specific entropy of PMMA adsorbed on oxides.

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Section: Methodsmentioning

confidence: 99%

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

2011

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“…On the other hand, if polar probes are injected into the column instead of n-alkanes, the adsorption of the adsorbate molecules on the stationary phase involves not only dispersive but also specific interactions [32][33][34][35]. Thus, -G 0 a is assumed to be the sum of two independent contributions accounting for both types of molecular interaction:…”

Section: Thermodynamic Parameters and Adsorption Measurementsmentioning

confidence: 99%

Surface modification of high-performance polymeric fibers by an oxygen plasma. A comparative study of poly(p-phenylene terephthalamide) and poly(p-phenylene benzobisoxazole)

Tamargo-Martı́nez

Martı́nez-Alonso

Villar–Rodil

et al. 2011

Journal of Chromatography A

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“…In previous papers, the surface properties and local and second order transition temperatures of poly(a-n-alkyl) methacrylate (Cn) and when it was adsorbed on silica or alumina were determined by Hamieh et al [57][58][59][60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Determination of Lewis Acid Base Properties of Poly(α-n-alkyl) Methacrylates Adsorbed on Silica by Inverse GC

Hamieh

2011

Chromatographia

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In this paper, the acid base properties in the Lewis terms of poly(a-n-alkyl) methacrylates and when they are adsorbed on silica, were determined. The acid base constants K A and K D of various polymers were calculated by testing the classical model and proposed a new model giving K A and K D and a third constant K reflecting the amphoteric character of our solid substrates and obtaining more precise and quantified results. When the length of alkyl group in side chain of poly(a-n-alkyl) methacrylates changes, the surface properties of such polymers also change and consequently affect all superficial characteristics and especially the acid base constants and the transition phenomena. It was also proved that the specific enthalpy was directly correlated to the acid base constants, the carbon atom number in the side chain of poly(a-n-alkyl) methacrylates and the acceptor AN and donor DN numbers of electrons of polar organic molecules, by the following relationship: DH sp = DH sp (AN, DN, K D , K A , n SC ).

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New approach to characterise physicochemical properties of solid substrates by inverse gas chromatography at infinite dilution

Cited by 79 publications

References 24 publications

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

Surface modification of high-performance polymeric fibers by an oxygen plasma. A comparative study of poly(p-phenylene terephthalamide) and poly(p-phenylene benzobisoxazole)

Determination of Lewis Acid Base Properties of Poly(α-n-alkyl) Methacrylates Adsorbed on Silica by Inverse GC

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