The role of organosilicon chemistry in the preparation of capillary columns for gas chromatography

Blomberg, Lars G.; Markides, Karin E.

doi:10.1002/jhrc.1240081002

Cited by 23 publications

(6 citation statements)

References 108 publications

(19 reference statements)

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“…The solvation parameter model in a form suitable for characterizing the solvation properties of stationary phases in gas chromatography is set out below [8,9] log k = c +/L + eE + sS + aA + bB (1) where k is the retention factor, c the model constant (which is dominated by the phase ratio), the lower case letters (l, e, s, a, b) are the system constants representing the stationary phase contribution to intermolecular interactions, and the capital letters (L, E, S, A, B) are the solute descriptors for the complementary interactions with the system constants of the stationary phase. Equation (1) has been written with the recent symbol set suggested by Abraham [13,14] to simplify model representation. No changes are implied in the interpretation of the model.…”

Section: Instrumentationmentioning

confidence: 99%

Influence of diphenylsiloxane composition on the selectivity of poly(dimethyldiphenylsiloxane) stationary phases for open-tubular column gas chromatography

Kiridena¹,

Koziol²,

Poole

et al. 2001

Chromatographia

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SummaryThe solvation parameter model is used to determine the system constants for four poly(dimethyldiphenylsiloxane) and a poly(cyanopropylmethylsiloxane) stationary phase at five equally spaced temperatures in the range 60-140 ~ Together with literature data for other poly(dimethyldiphenylsiloxane) stationary phases it is shown that the introduction of from 0 to 65% diphenylsiloxane groups into a poly(dimethylsiloxane) polymer influences selectivity through an increase in dipolarity/polarizabihty and hydrogen-bond basicity Changes in cohesion with variation in composition are small and electron lone pair interactions are weak and only significant at the higher end of the temperature range studied. The changes in system constants with composition are pseudo-linear for incorporation of less than 50% diphenylsiloxane groups. Higher incorporation of diphenylsiloxane groups as multimers results in a different contribution to selectivity The influence of temperature is to decrease the system constants with increasing temperature in an approximately linear manner. The poly(cyanopropylmethylsiloxane) stationary phase is significantly more cohesive, dipolar/polarizable and hydrogen-bond basic than the poly(dimethyldiphenylsiloxane) stationary phases.A notable feature of this stationary phase is the shallow change in the system constant for dipole-type interactions with temperature compared to the other system constants. A comparison of the properties of the poly(cyanopropylmethylsiloxane) stationary phasewith a poly(cyanopropylphenyldimethylsiloxane) stationary phase is made to provide a qualitative picture of the influence of the phenyl g rou p on the selectivity of cyanopropyl-containing stationary phases.

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Section: Instrumentationmentioning

confidence: 99%

Influence of diphenylsiloxane composition on the selectivity of poly(dimethyldiphenylsiloxane) stationary phases for open-tubular column gas chromatography

Kiridena¹,

Koziol²,

Poole

et al. 2001

Chromatographia

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“…Several column manufacturers now offer a second generation of low-bleed columns based on arylene-siloxane copolymer chemistries [3,20]. The arylene-siloxane copolymers have phenyl groups incorporated into the siloxane backbone to inhibit the formation of low-molecular-mass fragments by attack of terminal silanol groups on the polymer backbone.…”

Section: Resultsmentioning

confidence: 99%

Selectivity equivalence of poly(dimethyldiphenylsiloxane) stationary phases for open-tubular column gas chromatography

Poole

2001

J. Sep. Science

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“…All the glass parts were deactivated with decamethylcyclopentasiloxane (Petrarch Syst. Inc., Bristol, PA) [14,15]. The glass beads in the cold trap were HCI-leached and silanized in situ.…”

Section: Methodsmentioning

confidence: 99%

Dynamic headspace enrichment/reinjection for open tubular GC/FTIR analysis of volatiles in polymers

Schmidt

Blomberg

Wännman³

1988

J. High Resol. Chromatogr.

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An analytical system for the analysis of volatiles entrained in polymers is described. This system is based on a thermal desorption oven connected to a cold trap. After enrichment of headspace vapor, trapped material is reinjected and analyzed by open tubular gas chromatography/Fourier transform infrared spectroscopy, OTGC/FTIR. The thermal desorption oven is designed to provide different modes of sample introduction: use of a pyroprobe; insertion of a piece of quartz tubing with applied sample; or syringe injection. Headspace enrichment is carried out in a piece of fused silica capillary tubing filled with glass beads. The trap may be cooled either electrically using Peltier elements or with liquid nitrogen. A six‐port rotary valve is used for flow switching between enrichment and reinjection modes. All system parameters, temperatures, and timed events, are controlled from the gas chromatograph. Dynamic headspace analysis is demonstrated as a method for polymer characterization.

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The role of organosilicon chemistry in the preparation of capillary columns for gas chromatography

Cited by 23 publications

References 108 publications

Influence of diphenylsiloxane composition on the selectivity of poly(dimethyldiphenylsiloxane) stationary phases for open-tubular column gas chromatography

Influence of diphenylsiloxane composition on the selectivity of poly(dimethyldiphenylsiloxane) stationary phases for open-tubular column gas chromatography

Selectivity equivalence of poly(dimethyldiphenylsiloxane) stationary phases for open-tubular column gas chromatography

Dynamic headspace enrichment/reinjection for open tubular GC/FTIR analysis of volatiles in polymers

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