Liquid Chromatographic Separation of Mixtures of Polymers and Mineral Oil

Brewer, P. I.

doi:10.1038/188934a0

Cited by 16 publications

(2 citation statements)

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“…latex cross-linked by vulcanization with sulfur. Small pieces of rubber (milled surgical gloves) swell in organic solvents and act as molecular sieves [31]. In 1954$ Deuel and Neukom reported the first instance of a modified plant polysaccharide which, when swollen with water, was capable of desalting a protein solution [32].…”

Section: Gel Formersmentioning

confidence: 99%

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Chromatographic Separations on Porous Gels

Determann

1964

Angew. Chem. Int. Ed. Engl.

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the chain-transfer constant of dianisyl disulfide is greater than that of diphenyl disulfide. Among the aliphatic disulfides, only those with strained five-and six-mem-A. Pryor and P. K. Plait [J. Amer. chem. SOC. 85, 1496J have recently investigated the reaction between phenyl radicals and aliphatic disulfides. As the steric hindrance of the disulfide group increases, the free-radical displacement on the sulfur is suppressed in favor of a dehydrogenation by the phenyl radical. The effect of steric hindrance of aliphatic disulfides in a free-radical displacement reaction on the sulfur also manifests itself in the smaller chain-transfer constants of branched disulfides.bered rings react with the inert cyanoisopropyl radical [54]; the greater strain of the five-membered ring manifests itself clearly in the higher rate of reaction on freeradical attack. It should be mentioned that dibenzyl disulfide undergoes free-radical cleavage much more easily than the purely aliphatic disulfides ; the chaintransfer constant is also greater than for aliphatic disulfides.

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Section: Gel Formersmentioning

confidence: 99%

“…On the other hand, separations achieved on small pieces of rubber [31] appear to be based on the molecularsieve effect. The Kd values of polyisobutene (mol.…”

Section: Gel Chromatography On Lipophilic Gelsmentioning

confidence: 99%

Chromatographic Separations on Porous Gels

Determann

1964

Angew. Chem. Int. Ed. Engl.

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Stofftrennung durch Chromatographie an porösen Gelen

Determann

1964

Angewandte Chemie

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Tabelle 3. Homolytische Spaltung von Disulfiden durch Cyanisopropyl-Radikale oder durch Makroradikale be i der Styrol-Polyinerisation. Disulfid Spaltung [%I durch Cyanisopropyl-Radikale WI la1 K ( "C) [b] bei der Styrol-Polymerisation 117,181 11.8 16,s 31 13,3 S,8 1,2 5 3 I l 2 0,14(99) 0,06(50) 0,33(99) icl O,ll(SO) 0,01(99) 0,005(99) [d] [*I Erweiterte Fassung yon Vortragen: Farbwerke Hoechst, Frankfurt(Main)-Hochst, Dezember 1962; Osterreichische Gesellschaft fur Physiologische Chemie, Wien, Februar 1963 ; Kolloid-Gesellschaft, Bad Oeynhausen, Oktober 1963. [**I In dieser Arbeit werden Molekulgewichte und -groBen als proportional angenommen. [I] Zusammenfassungen iiber Teilgebiete: P. Flodin, Dissertation, Universitat Uppsala (Schweden), 1962 [zu erhalten bei A. B. Pharmacia, Uppsala (Schweden)] ; J. Porath, Advances Protein schon langer bekannte Molekularsiebe dar, in denen durch die Raumnetz-Struktur der SiO4-und A104-Tetraeder Hohlraume (etwa 50 % des Volumens) bestehen, die durch Poren verbunden sind. Solche heute synthetisch hergestellte Zeolithe werden z. B. bei der Gastrocknung oder der Abscheidung von Olefinen aus Gasgemischen verwendet, sie haben auch bei extremen Temperaturen eine spezifische Affinitat zu polaren Stoffen. Die erste allgemeiner anwendbare Methode zur Trennung groBer Molekule von kleinen Molekulen, die Di-

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Conventional Entropy-Controlled Methods of Polymer Liquid Chromatography

Malik,

Berek

2023

Physical Chemistry in Action

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Liquid Chromatographic Separation of Mixtures of Polymers and Mineral Oil

Cited by 16 publications

References 1 publication

Chromatographic Separations on Porous Gels

Chromatographic Separations on Porous Gels

Stofftrennung durch Chromatographie an porösen Gelen

Conventional Entropy-Controlled Methods of Polymer Liquid Chromatography

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