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Designing an “A‐Ring‐with‐Branches” Polymer Topology by Electrostatic Self‐Assembly and Covalent Fixation with Interiorly Functionalized Telechelics Having Cyclic Ammonium Groups
Author(s) -
Oike Hideaki,
Washizuka Masakazu,
Tezuka Yasuyuki
Publication year - 2001
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 - 10.1002/1521-3927(20011001)22:14<1128::aid-marc1128>3.0.co;2-h
Subject(s) - counterion , ring (chemistry) , polymer , topology (electrical circuits) , polymer chemistry , covalent bond , materials science , chemistry , ion , organic chemistry , composite material , mathematics , combinatorics
A novel and unusual polymer topology, i.e. a‐ring‐with‐two‐branches , has been constructed efficiently by making use of an interiorly functionalized poly(tetrahydrofuran) (poly(THF)) having two pyrrolidinium groups. The dicarboxylate counterion, i. e. terephthalate, was then introduced by an ion‐exchange reaction of the interiorly located pyrrolidinium group. Subsequent heat treatment under appropriate dilution caused an efficient polymer cyclization to produce an a‐ring‐with‐two‐branches polymer topology in high yield through the selective and quantitative ring‐opening of the pyrrolidinium groups by the dicarboxylate counterion.