Synthesis of polymeric topological isomers through electrostatic self-assembly and covalent fixation with telechelic poly(THF) having cyclic ammonium salt groups

• Published in: Polymer international Vol. 52; no. 10; pp. 1579 - 1583
• Main Authors: Tezuka, Yasuyuki, Tsuchitani, Akiko, Oike, Hideaki
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.10.2003; Wiley
• Subjects: Applied sciences; Chemical modifications; Chemical reactions and properties; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; polymeric topological isomers; ring polymers; self-assembly; telechelics; Intramolecular reaction; Self assembly; Molecular structure; Telechelic polymer; ring polymers; Experimental study; Tetrahydrofuran polymer; Pyrrolidine derivatives; polymeric topological isomers; Quaternary ammonium compound; Structure processing relationship; Topological structure; telechelics; Anion exchange; self-assembly; Cyclization; Cyclic polymer; Preparation; Carboxylate; Counter ion
• ISSN: 0959-8103; 1097-0126
• DOI: 10.1002/pi.1342

A pair of macromolecular constitutional isomers having topologically distinctive constructions, ie θ‐shaped and manacle‐shaped polymers, has been synthesized through covalent conversion of an electrostatic polymer self‐assembly comprised of bifunctional linear poly(tetrahydrofuran) [poly(THF)] having N‐phenylpyrrolidinium salt end groups carrying tricarboxylate counteranions (1) under various dilutions. The presence of the two constitutional polymeric isomers was revealed by means of a reverse‐phase liquid chromatography (RPLC) technique. Moreover, size‐exclusion chromatography (SEC) confirmed that one major component possesses notably larger hydrodynamic volume than another, and is assigned as a manacle‐shaped isomer while a minor component as a θ‐shaped isomer. Further details of this unique process were investigated by RPLC analysis of topological isomer products obtained from a series of poly(THF) precursors, 1, having different molecular weights. Copyright © 2003 Society of Chemical Industry