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Determination of the molecular-weight distribution of polyethylene glycols by thin-layer chromatography coupled with densitometry

✍ Scribed by L. Favretto; G.Pertoldi Marletta; L.Favretto Gabrielli

Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
604 KB
Volume
50
Category
Article
ISSN
1873-3778

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✦ Synopsis

Thin-layer chromatography with multiple one-dimensional elution was used to determine the molecular-weight distribution of polyethylene glycols of the general formula HO(CH2CHz0)nH after conversion into their dichloro derivatives. The adsorbent was silica gel, the developer was based on a mixture of z-butanone and water, and the spots were visualised with iodine vapour, and then evaluated with the aid of an optical densitometer. This method permitted the quantitative fractionation of polyethylene glycols with degrees of polymerisation (ut) of up to 21,

DISTRIBUTION OF POLYETHYLENE GLYCOLS -

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Gas chromatographic determination of the
Gas chromatographic determination of the molecular-weight distribution of polyethylene glycol products
✍ C. Calzolari; L. Favretto; B. Stancher πŸ“‚ Article πŸ“… 1969 πŸ› Elsevier Science 🌐 English βš– 318 KB

Notes CHROM. 3847 NOTES COMPARISON I3lZT\Vl~~N THE VAPOUR-I'R1BSURl.Z OSMOMl%TRIC (VI%) VALUIZS OF 1v~ FOR THE STARTING POLYETHYLENE GLYCOLS AND THE GAS-LIQUID CHROMhTOGRAPHIC (GTK) d?~ ORTAINRD FOR THE CHLORO AND THE TRIIMETHYLSILYL DBRIVATIVES3 I T. NAICAGAVA, ET. TNOUE AND I<. I<unrYhuA, Awd. CJw