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Molecular weight distributions of block copolymers of poly(isoprene:styrene) by gel permeation chromatography

โœ Scribed by D.N. Cramond; J.M. Hammond; J.R. Urwin

Publisher
Elsevier Science
Year
1968
Tongue
English
Weight
392 KB
Volume
4
Category
Article
ISSN
0014-3057

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โœฆ Synopsis

Gel permeation chromatograms of block copolymers of cis 1:4 polyisoprene and polystyrene with narrow molecular weight and composition distributions have been examined by the normal -probability plot method. The parameters l~lw, 1~I, and standard deviation ~ have been evaluated and the results compared with IVIr~ obtained by high speed osmometry. Fractionation appears to be achieved according to chain length for a particular composition.

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Determination of molecular weight distributions of novolac resins by gel permeation chromatography
โœ Timothy R. Dargaville; Felix N. Guerzoni; Mark G. Looney; Devon A. Shipp; David ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 214 KB ๐Ÿ‘ 2 views

The number-and weight-average molecular weights of several statistical and high ortho novolac resins were determined using gel permeation chromatography (GPC). The standards used were pure compounds having between 2 and 12 phenol units bridged via methylene linkages. Three series of compounds were s