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Fractionation of a statistical copolymer in a demixing-solvent system: Theory and experiment

✍ Scribed by Jiří Podešva; Jaroslav Stejskal; Ondřej Prochǎzka; Pavel Špaček; Sabine Enders

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
763 KB
Volume
48
Category
Article
ISSN
0021-8995

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✦ Synopsis

It has been shown that, under specific conditions, a demixing-solvent fractionation according to chemical composition can be applied to statistical copolymers. Formally, identical expressions have been derived for the distribution of a copolymer between coexisting phases in precipitation (sol-gel) and demixing-solvent fractionations. Theory predicts that the effects of molar mass and chemical composition cannot be separated in either of the phaseequilibrium fractionations. With demixing solvents, the partition coefficient depends steeply on copolymer composition, which enables one, e.g., to separate homopolymers from a blend.

Multistep demixing-solvent fractionation of a copolymer may proceed only in specific cases, e.g., immediately below the maximum of the coexistence curve. A feasibility study was performed with a chemically heterogeneous statistical copolymer of styrene and 2-methoxyethyl methacrylate; the experimental results have confirmed the theoretical predictions.

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