Separation of telechelic oligomers according to architecture by liquid chromatography.
Telechelic oligomers based on diethylene glycol or lower polyethylene glycols and caprolactone or butene oxide can be separated according to their architecture by means of liquid chromatography under adsorption conditions for the hydrophobic block and critical or exclusion conditions for PEG. This behavior, which is predicted by the theory, can be verified by the experiment for block copolymers of ethylene oxide with ɛ-caprolactone and butene oxide. The individual peaks were identified by matrix-assisted time-of-flight mass spectrometry (MALDI-TOF-MS) of fractions obtained by semipreparative liquid chromatography at critical conditions of center block (PEG) and adsorption conditions for outer blocks (PCL and PBO).
H.E.J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan; NAWI Graz, Central Polymer Laboratories (CePoL), Heinrichstrasse 28 and Stremayrgasse 16, A-8010 Graz, Austria; Institute of Chemistry, Karl-Franzens-University, Heinrichstrasse 28, A-8010 Graz, Austria. Electronic address: mimran.malik@iccs.edu.
Muhammad Imran
MI
Malik
Hasnat
H
Ahmed
Bernd
B
Trathnigg
D002853:Chromatography, Liquid / Q000379:methods*; D008962:Models, Theoretical; D011108:Polymers / Q000737:chemistry*
D011108:Polymers
Block copolymer; Interaction parameter; Liquid chromatography; MALDI-TOF-MS; Symmetry