Physicochemical Measurements (Inverse Gas Chromatography)

Voelkel, Adam

doi:10.1016/b978-0-12-385540-4.00020-1

Cited by 18 publications

(15 citation statements)

References 196 publications

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“…Due to its applicability in determining the surface properties of solids in varied forms such as films, fibres and powders of both crystalline and amorphous structures, IGC has been extensively used for surface characterisation. The applicability of IGC in measurements of physicochemical properties of various materials has been thoroughly described in the literature [15][16][17][18]. Data obtained from IGC experiments may, in favourable cases, correlate directly with observed performance criteria, such as colour development, gloss, rheological properties, adhesion and mechanical properties [19][20][21].…”

Section: Tablementioning

confidence: 98%

Lewis acid/base character and crystallisation properties of poly(butylene terephthalate)

Santos

Guthrie

2015

Journal of Chromatography A

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Two grades of poly(butylene terephthalate) were analysed by means of inverse gas chromatography (IGC) and the results correlated with the respective crystallisation properties. The following parameters were determined by IGC: the dispersive component of the surface tension, the enthalpy and the entropy of adsorption of selected polar and apolar probes, and the Lewis acidity and basicity constants, Ka and Kb respectively. The interpretation of the values determined for Ka and Kb is in agreement with the FTIR spectra relating to the carboxyl end-group and the hydroxyl end-group concentrations in these polymers. The differences in the molecular weight values and in the end-group type and concentration, between the two grades of PBT, do not cause differences in the crystallisation activation energy. This observation suggests that there is a leading contribution of the Lewis basic sites to the crystallisation activation energy of the grades of PBT that were analysed. However, the lower value of Ka and the greater molar mass of one of the PBT grades lead to a corresponding lower crystallisation degree.

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Section: Tablementioning

confidence: 98%

Lewis acid/base character and crystallisation properties of poly(butylene terephthalate)

Santos

Guthrie

2015

Journal of Chromatography A

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“…according to Schultz-Lavielle procedure using n-alkanes as test compounds (hexane, heptane, octane, nonane, decane) [25,26].…”

Section: Inverse Gas Chromatographymentioning

confidence: 99%

Influence of Change of Si/Al Ratio on the Synthesis of Mesoporous Aluminosilicates and Flexural Strength of Novolac Composites

Strzemięcka

Sandomierski

Voelkel

2019

J Inorg Organomet Polym

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Fillers used in phenol-formaldehyde resins should have high thermal stability, be cheap and do not have a negative impact on the resin crosslinking process. These features have mesoporous aluminosilicates which are used in many industries. In this work, effective and simple synthesis of mesoporous materials (with a different Si/Al ratio) from a solid source of silicon has been presented. Materials were used as fillers for phenol-formaldehyde composites. Synthesized mesoporous aluminosilicates have been characterized using Scanning electron microscopy, Energy dispersive spectrometry, Transmission electron microscopy, X-ray Difractometry, Nitrogen adsorption/desorption measurements and Inverse gas chromatography. The properties of the obtained materials are closely related to the amount of aluminum and silicon in the tested materials. All synthesized materials have a larger specific surface area than the substrates used during the synthesis. The mechanical properties of the novolac composites were tested using three-point flexural test. The composite with aluminosilicate which have the lower surface area has the highest flexural strength and it is higher than the strength of the composites with substrates.

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“…The dispersive properties of the surface were described by use of the dispersive component of the surface energy, γ s d . The γ s d was determined according to the Schultz-Lavielle method [13][14][15][16]. Acid-base properties of the surface were described by K A and K D parameters, respectively [14][15][16].…”

Section: Dynamic Mechanical Thermal Analysismentioning

confidence: 99%

New ecological composites based on natural renewable resources

Strzemięcka¹,

Kłapiszewski²,

Jamrozik³

et al. 2017

Int. J. CMEM

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The use of the lignin-corundum hybrid fillers for phenolic resins was showed. The very important aspect of the use of lignin for phenolic resin composites is the reduction of phenol emission. The emission of phenol from the phenolic resin-hybrid filler composites were studied by headspace analysis. The physicochemical properties of the new hybrid fillers as well as the thermomechanical properties of the composites with them were examined. The surface properties of hybrid fillers were studied by inverse gas chromatography (IGC). The chemical structure of the new fillers was tested by Fourier transform infrared spectroscopy (FTIR). The dynamic mechanical thermal analysis (DMTA) was used to test the thermomechanical properties of the model composites for the use of abrasive tool production.

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Physicochemical Measurements (Inverse Gas Chromatography)

Cited by 18 publications

References 196 publications

Lewis acid/base character and crystallisation properties of poly(butylene terephthalate)

Lewis acid/base character and crystallisation properties of poly(butylene terephthalate)

Influence of Change of Si/Al Ratio on the Synthesis of Mesoporous Aluminosilicates and Flexural Strength of Novolac Composites

New ecological composites based on natural renewable resources

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