期刊
MACROMOLECULAR CHEMISTRY AND PHYSICS
卷 211, 期 8, 页码 869-878出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200900466
关键词
amphiphiles; block copolymers; matrix-assisted laser desorption/ionization mass spectrometry (MALDI-TOF MS); N-vinyl pyrrolidone; reversible addition/fragmentation chain transfer (RAFT)
New amphiphilic block copolymers consisting of N-vinyl pyrrolidone and vinyl acetate were synthesized via controlled radical polymerization using a reversible addition/fragmentation chain transfer (RAFT)/macromolecular design via the interchange of xanthates (MADIX) system. The synthesis was carried out in 1,4-dioxane as process solvent. In order to get conclusions on the mechanism of the polymerization the molecular structure of formed copolymers was analysed by means of different analytical techniques. C-13 NMR spectroscopy was used for the determination of the monomer ratios. End groups were analysed by means of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. This technique was also used to determine possible fragmentations of the RAFT end groups. By means of a combination of size exclusion chromatography, C-13 NMR and static light scattering molar mass distributions and absolute molar masses could be analysed. The results clearly show a non-ideal RAFT mechanism.
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