Premium
Synthesis of polymeric topological isomers through electrostatic self‐assembly and covalent fixation with telechelic poly(THF) having cyclic ammonium salt groups
Author(s) -
Tezuka Yasuyuki,
Tsuchitani Akiko,
Oike Hideaki
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1342
Subject(s) - tetrahydrofuran , bifunctional , covalent bond , polymer , salt (chemistry) , polymer chemistry , chemistry , condensation polymer , size exclusion chromatography , polymerization , ammonium , macromolecule , organic chemistry , biochemistry , solvent , catalysis , enzyme
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