CO2‐ and O2‐Sensitive Fluorophenyl End‐Capped Poly(ethylene glycol). Issue 1 (24th November 2013)

• Record Type: Journal Article
• Authors: Choi, Jung Yoon; Kim, Jin Young; Moon, Hyo Jung; Park, Min Hee; Jeong, Byeongmoon
• Is Part Of: Macromolecular rapid communications. Volume 35:Issue 1(2014:Jan.)
• Page Start: 66
• Page End: 70
• Publication Date: 2013-11-24
• Subjects: Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201300700
• Languages: English
• ISSNs: 1022-1336

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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. ¹⁹F NMR and ¹H 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. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgg3zw8r974" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>