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Fractionation of a diblock copolymer in a demixing-solvent system

✍ Scribed by Jir̆í Podes̆va; Jaroslav Stejskal; Pavel Kratochvíl

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
887 KB
Volume
49
Category
Article
ISSN
0021-8995

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✦ Synopsis

Phase behavior of a hydrogenated styrene / isoprene diblock copolymer in a dimethylformamide/methylcyclohexane demixing-solvent pair has been studied. At a fixed copolymer concentration (1% w/v), the scheme of phase behavior (temperature vs. mixed-solvent composition) of the system has been found to be complex, with several areas where various supramolecular structures are spontaneously formed. In a particular area of the scheme, a multistep demixing-solvent fractionation of the copolymer has been performed. The resulting fractions have been characterized and the data used to construct integral distribution functions of copolymer molar mass and copolymer composition. These functions have been compared with those obtained by a previously reported light-scattering characterization of the whole, unfractionated, nonhydrogenated precursor of the copolymer. 0 1993 John Wiley & Sons. Inc.

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