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Thermally Responsive Poly(ethylene oxide)‐Based Polyrotaxanes Bearing Hydrogen‐Bonding Pillar[5]arene Rings **
Author(s) -
Kato Kenichi,
Onishi Katsuto,
Maeda Koki,
Yagyu Masafumi,
Fa Shixin,
Ichikawa Takahiro,
Mizuno Motohiro,
Kakuta Takahiro,
Yamagishi Tadaaki,
Ogoshi Tomoki
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202005099
Subject(s) - ethylene oxide , hydrogen bond , materials science , pillar , polymer chemistry , oxide , polymer , melting point , rotaxane , poly ethylene , chemical engineering , ethylene , molecule , composite material , chemistry , organic chemistry , supramolecular chemistry , structural engineering , engineering , copolymer , metallurgy , catalysis
Poly(ethylene oxide)s (PEOs) are useful polymers with good water solubility, biological compatibility, and commercial availability. PEOs with various end groups were threaded into pillar[5]arene rings in a mixture of water and methanol to afford pseudopolyrotaxanes. Corresponding polyrotaxanes were also constructed by capping COOH‐terminated pseudopolyrotaxanes with bulky amines, in which multiple hydrogen bonds involving the pillar[5]arene OH groups were critically important to prevent dethreading. The number of threaded ring components could be rationally controlled in these materials, providing a simple and versatile method to tune the mechanical and thermal properties. Specifically, a polyrotaxane with a high‐molecular‐weight axle became elastic upon heating above the melting point of PEOs and exhibited temperature‐dependent shape memory property because of the topological confinement and crosslinked hydrogen bonds.