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CO 2 ‐ and O 2 ‐Sensitive Fluorophenyl End‐Capped Poly(ethylene glycol)
Author(s) -
Choi Jung Yoon,
Kim Jin Young,
Moon Hyo Jung,
Park Min Hee,
Jeong Byeongmoon
Publication year - 2014
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201300700
Subject(s) - lower critical solution temperature , ethylene glycol , aqueous solution , peg ratio , chemistry , polymer , polymer chemistry , carbon dioxide , materials science , organic chemistry , copolymer , finance , economics
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 °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 °C. 19 F NMR and 1 H NMR spectra of the PF‐PEG‐PF in D 2 O 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.