Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1218, Issue 46, Pages 8370-8378Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2011.09.044
Keywords
Liquid chromatography at critical conditions (LCCC); Two-dimensional liquid chromatography (2D-LC); MALDI-TOF MS; ESI-Q-TOF MS; Cationic ring-opening polymerization (CROP); Poly(2-oxazoline)s
Funding
- Dutch Polymer Institute (DPI) [612]
- Thuringer Ministerium fur Bildung, Wissenschaft und Kultur [B515-07008, B715-08011]
- Landesgraduiertenforderung Thuringen (Germany)
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In this study liquid chromatography at critical conditions for poly(2-ethyl-2-oxazoline)s (PEtOx) has been performed for the first time in order to analyze functional PEtOx homopolymers and block copolymers. Besides the verification of the critical point of adsorption with two series of ester end group functionalized PEtOx homopolymers, to evaluate the effect of both the chain length dependence and the end group polarity, using a cyano column with a solvent combination of 2-propanol and water, also two-dimensional liquid chromatography (2D-LC) has been applied for a poly(2-oxazoline) block copolymer. The combined characterization techniques provided further information about the polymerization procedure with regard to the formation of side-products by separation of the block copolymer from the corresponding homopolymer impurities. In addition, hyphenation of LCCC with MALDI-TOF MS and ESI-Q-TOF tandem mass spectrometry verified the obtained results. (C) 2011 Elsevier B.V. All rights reserved.
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