Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 212, Issue 12, Pages 1221-1228Publisher
WILEY-BLACKWELL
DOI: 10.1002/macp.201000711
Keywords
block copolymers; critical adsorption point; liquid chromatography at critical conditions; polydimethylsiloxane; polystyrene
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Funding
- Claude Leon Foundation
- University of Stellenbosch
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In this study, liquid chromatography at critical conditions (LCCC) is used to determine the block lengths and molar masses of polydimethylsiloxane-block-polystyrene copolymers synthesized via atom transfer radical polymerization (ATRP) techniques. In addition, the analysis allows for the determination of the presence of homopolymers in the samples. LCCC at the critical point of polydimethylsiloxane (PDMS) on a reversed phase column allows for the determination of PDMS homopolymer and the length of the polystyrene (PS) block in the block copolymer which elutes in the size exclusion chromatography (SEC) regime under these conditions. The PDMS block length and PS homopolymer can be obtained under normal phase conditions. The results of LCCC are compared with data from conventional SEC.
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