期刊
JOURNAL OF SEPARATION SCIENCE
卷 33, 期 14, 页码 2052-2059出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201000181
关键词
Block copolymer; Critical conditions; Gradient elution; LC; PEG; Polypropylene glycol; Ternary mobile phase
资金
- Higher Education Commission of Pakistan
In ternary mobile phases consisting of acetone, methanol, and water, the retention of PEG on reversed-phase columns is independent on molar mass at certain compositions of the mobile phase. Along this critical adsorption line, the retention of polypropylene glycol varies quite strongly, which can be utilized in the separation of block copolymers. Gradient elution along the critical line allows a baseline separation of all oligomers in polypropylene glycol up to approximately 25 propylene oxide units. The same resolution can be achieved in the separation of ethylene oxide-propylene oxide block copolymers, regardless of the length of the ethylene oxide block.
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