Elution Behavior of Chemically Different Probes on the Evaluation of Surface Properties of Cellulose by Inverse Gas Chromatography

Czeremuszkin, G.; Mukhopadhyay, Prithu; Sapieha, S.

doi:10.1006/jcis.1997.5074

Cited by 13 publications

(5 citation statements)

References 30 publications

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“…The 1G AB A for benzene, methylene chloride and diethyl ether are not included in the analysis because of to large peak tailing in their chromatograms. This 'delayed' elution could be caused by preferential adsorption of these probes due to strong acid -base interaction with the adsorbent [73] and/or by its heterogeneity and surface roughness [57,58]. Based on the 1H AB A shown in Table 9, Fig.…”

Section: Acid -Base Properties Obtained By the Vocg And Cqc Modelsmentioning

confidence: 99%

Acid–base characterization of wood and selected thermoplastics

Wålinder¹,

Gardner²

2002

Journal of Adhesion Science and Technology

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The objective of this work was to study the acid-base properties of wood, poly(vinyl chloride) (PVC), nylon 6 and 6,6 by wetting and inverse gas chromatography (IGC) analyses. Information about the acid-base characteristics of these materials should be useful to improve the intermolecular bonding properties in wood-plastic composites. The acid-base properties of pine wood veneers, PVC and nylon 6,6 were determined by contact angle analysis using the work of adhesion (or Fowkes), van Oss-Chaudhury-Good (vOCG) and Chang-Qin-Chen (CQC) approaches. The IGC analysis was performed on maple wood, PVC and nylon 6 particles, and was carried out at in nite dilution using a series of both non-polar and polar acid-base probe gases. The contact angle analysis of the wood veneers using both the work of adhesion and the vOCG approaches showed that the presence of wood extractives was the dominant factor in uencing the acid-base properties of the veneers. Particularly, it was shown that aging of non-extracted veneers increased and decreased their acidic and basic properties, respectively. This is presumably due to reorientation of functional groups and oxidation at the wood extractives-air interface. In the vOCG model, considerably higher base/ acid ratios were obtained when using probe liquid parameters according to van Oss compared to those obtained by using liquid parameters according to Della Volpe and Siboni. Based on both the vOCG and the CQC models it was shown that nylon 6,6 had greater acid and base parameters than PVC. Additionally, the CQC model seems to be a promising tool to determine the acid-base characteristics of materials. The IGC analysis showed that nylon 6 had greater acid and base parameters than both wood and PVC which implies a strong ability to enter into acid-base interactions. The results also suggested that an increase in the basic character of wood could have the potential to improve its bonding with both PVC and nylon 6.

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Section: Acid -Base Properties Obtained By the Vocg And Cqc Modelsmentioning

confidence: 99%

Acid–base characterization of wood and selected thermoplastics

Wålinder¹,

Gardner²

2002

Journal of Adhesion Science and Technology

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“…Using IGC, the values of the dispersive component of the surface energy determined for cellulosic samples lie in the range 32 to 52 mJ/m 2 (18,48,(57)(58)(59). However, the results from these investigations into the surface chemistry of MCC by IGC may not be suitable for comparison with the results reported here, since many samples were heated to more than 80°C prior to analysis.…”

Section: The Use Of Surface Energy Measurements In Determining the Phmentioning

confidence: 99%

Surface Energy of Microcrystalline Cellulose Determined by Capillary Intrusion and Inverse Gas Chromatography

Steele

Moreton²,

Staniforth

et al. 2008

AAPS J

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Surface energy data for samples of microcrystalline cellulose have been obtained using two techniques: capillary intrusion and inverse gas chromatography. Ten microcrystalline cellulose materials, studied using capillary intrusion, showed significant differences in the measured surface energetics (in terms of total surface energy and the acid-base characteristics of the cellulose surface), with variations noted between the seven different manufacturers who produced the microcrystalline cellulose samples. The surface energy data from capillary intrusion was similar to data obtained using inverse gas chromatography with the column maintained at 44% relative humidity for the three samples of microcrystalline cellulose studied. This suggests that capillary intrusion may be a suitable method to study the surface energy of pharmaceutical samples.

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“…This delayed elution of polar probes is in agreement with the literature for cellulose. 17 Elution efficacy was calculated from the integration of peak area (from the start of a peak to 60 min, because 60 min was the time when the detector response returned to an apparent baseline) and this was found to almost always be complete for nonpolar probes, but incomplete for polar probes (Tables 7-10). It can be seen that the elution efficacy of polar probes was very low for HPMC samples (Table 7 for Methocel and Table 8 for Pharmacoat).…”

Section: Polar Probesmentioning

confidence: 99%