期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 35, 期 1, 页码 66-70出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201300700
关键词
fluoropolymer; oxygen-sensitive; stimuli-sensitive
资金
- National Research Foundation of Korea - Korean Government (MSIP) [2009-0080447, 2012M3A9C6049784]
- National Research Foundation of Korea [2012M3A9C6049835, 2009-0080447] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Pentafluorophenyl end-capped poly(ethylene glycol) (PF-PEG-PF) aqueous solution shows a lower critical solution temperature (LCST), which is sensitive to the type of gases dissolved in the solution. LCST increases from 24.5 to 26 degrees C when dissolved carbon dioxide is replaced by oxygen. The transparent-to-turbid transition is reversibly observed when the dissolved carbon dioxide in the PF-PEG-PF aqueous solution is exchanged with oxygen, and vice versa, at 24.5 degrees C. F-19 NMR and H-1 NMR spectra of the PF-PEG-PF in D2O suggest that 1) dehydration of PEG is the main reason of developing LCST of the PF-PEG-PF aqueous solution, 2) minute differences in the intermolecular interactions, as demonstrated by changes in the chemical shift of the PF-PEG-PF peaks, induce such a difference in LCST. This paper provides a new insight in designing a stimuli-responsive polymer in that fine tuning of a phase transition can be controlled by the type of dissolved gas.
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