Fluorine-Containing Polymers as Solid Supports in Gas Chromatography.

Abstract

b Certain fluorine-containing polymers have been critically evaluated as solid supports for gas (chromatography. The effects of flow rcte, temperature, sample size, type of polymer, and both kind and concertration of liquid phase were studied to establish conditions for optimum separations. Columns with fluorine-containing polymer supports can b e made almost as efficient as typical diatomaceous earth columns. In addition, superior peak symmetry can often be obtained for highly polar compounds by using fluorocarbon and chlorofluorocarbon supports. Columns made with fluorinecontaining polymer supports often show nonlinear specific retention volume vs. per cent liquid substrate plots. This phenomenon can he explained by the spreading behavior cf substrate liquid on the support. Differences in spreading are only encountered when the surface energy of the liquid is higher than that of the !surface.

Reaction network and kinetics of the vapor-phase catalytic hydrodenitrogenation of quinoline

“…As silicones wet Teflon, the SP-2310 (a cyanopropylsilicone) used previously with Supelcoport was tried with Chromosorb T -probably the best Teflon support (Kirkland, 1963 …”

New developments in affinity chromatography

“…Solid perfluorocarbon polymers such as poly(tetrafluoroethylene) (PTFE) thus could offer some advantages as sterilizable supports for affinity chromatography. Aggregates of powdered poly(tetrafluoroethy1ene) have been used as supports for gas/liquid chromatography (Kirkland, 1963) and as hydrophobic adsorbents for the separation of proteins and nucleic acids (Hjerten, 1978;Hjerten and Hellman, 1980;Williams eta/., 1986). However, to date, the intractable chemical inertness and hydrophobicity of solid perfluoropolymer supports have precluded their use in affinity chromatography where hydrophilicity and ease of derivatization are two key desirable features favouring the choice of an appropriate matrix (Groman and Wilchek, 1987).…”

Capillary gas adsorption chromatography

“…Considering capillary columns with aluminum oxide, mention should be made of the possibility of performing (2) ethane; (3) ethylene; (4) propane; (5) cyclopropane; (6) propylene; (7) (17) cyclopentane; (18) isopentane; (19) 1,2-butadiene + propyne + trans-1,2-dimethylcyclopropane; (20) 1,1-dimethylcyclopropane; (21) rc-pentane; (22) «s-l,l-dimethylcyclopropane + 1,3-butadiene; (23) ethylcyclopropane; (24) trimethyl-l-butene; (25) cyclopentane; (26) trans-2-pentene; (27) 2-methyl-2-butene; (28) 1-pentene + methylenecyclobutane; (29) 2-methyl-l-butene; (30) cis-2-pentene; (31) trimethyl-1,2-butadiene; (32) 2-butyne; (33) 2,2-dimethylbutane + 1,1,2-trimethylcyclopropane; (34) methylcyclopentane + 3,3-dimethyl-1-butene; (35) ethylcyclobutane; (36) cyclohexane; (37) 1-butyne + 2,3-dimethylbutane; (38) 2-methylpentane; (39) trimethylpentane; (40) 1,2-pentadiene + 2,3-pentadiene; (41) vinylcyclopropane; (42) n-hexane; (43) trans-4-methyl-2-pentene + isopropylcyclopropane; (44) 2-methyl-l,3-butadiyne; (45) 1-methylcyclopentene; (46) 4-methyl-l-pentene; (47) cis-1,3-pentadiene; (48) traris-l,3-pentadiene; (49) trimethyl-1-butyne; (50) isopropylacetylene; (51) 2-pentyne. (B) Column, 129 m X 0.25 mm; adsorbent, aluminum oxide (0.6 mg/m); temperature, 100 °C.…”

“…(B) Column, 129 m X 0.25 mm; adsorbent, aluminum oxide (0.6 mg/m); temperature, 100 °C. (1) n-Pentane; (2) 2-methylpentane; (3) 3-methylpentane; (4) n-hexane; (5) 2,2-dimethylpentane; (6) 2,2,3trimethylbutane; (7) 2-methylhexane; (8) triethylhexane; (9) cts-2,5-dimethyl-3-hexene; (10) 2,2,4-trimethylpentane + trans-2,2-dimethyl-3-hexene; (11) trans-2,5-dimethyl-3-hexane; (12) benzene + n-heptane; (13) 2,4,4-trimethyl-l-pentene; (14) 2,4,4-trimethyl-2-pentene + 2,2-dimethylhexene; (15) cts-2,2-dimethyl-3-hexene; (16) 2,5-dimethylhexane; (17) 2,4-dimethylhexane + 1,1,3-trimethylcyclopentane; (18) trans-2-methyl-3-heptene + 2,2,3-trimethylpentane; (19) trans-4-ethyl-2-hexene + 3,3-dimethylhexane + 2,5-dimethyl-l-hexene; (20) 3,4-dimethyl-l-hexene + trans-6-methyl-3-heptene; (21) trans-3,4,4-trimethyl-2-pentene; (22) trimethylheptane; (23) cis-4methyl-3-ethyl-2-pentene + 3,4-dimethylhexane; (24) 3-ethyl-3-hexane; (25) 2-methyl-l-heptene; (26) 3-methyl-3-ethylpentane; (27) 2-methyl-3-ethyl-2-pentene + 1-octene; (28) trans-3-octene; (29) 2-methyl-2-heptene; (30) n-octane; (31) toluene; (32) trans-2-octene + trans-1 -methyl-2-ethylcyclopentane; (33) 1,1-dimethylcyclohexane; (34) trans-1,3-dimethylcyclohexane; (35) isopropylcyclopentane; (36) ci's-l-methyl-2-ethylcyclopentane; (37) n-propylcyclopentane; (38) 4-vinylcyclohexane; (39) ethylcyclohexane; (40) ethylbenzene; (41) p-xylene; (42) m-xylene; (43) o-xylene. rapid analysis of hydrocarbon gases for 100 s. This is especially essential in industrial applications.…”