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Formation of a Polypseudorotaxane via Self‐Assembly of γ‐Cyclodextrin with Poly( N ‐isopropylacrylamide)
Author(s) -
Wang Jin,
Li Shuo,
Ye Lin,
Zhang AiYing,
Feng ZengGuo
Publication year - 2012
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/marc.201200017
Subject(s) - cyclodextrin , poly(n isopropylacrylamide) , aqueous solution , supramolecular chemistry , molecule , polymer , polymer chemistry , self assembly , chemistry , materials science , nanotechnology , copolymer , organic chemistry
A polypseudorotaxane (PPR) comprising γ‐cyclodextrin (γ‐CD) as host molecules and poly( N ‐isopropylacrylamide) (PNIPAM) as a guest polymer is prepared via self‐assembly in aqueous solution. Due to the bulky pendant isopropylamide group, PNIPAM exhibits size‐selectivity toward self‐assembly with α‐, β‐, and γ‐CDs. It can fit into the cavity of γ‐CD to give rise to a PPR, but cannot pass through α‐CD and β‐CD under the same conditions. The ratio of the number of γ‐CD molecules to entrapped NIPAM repeat units is kept at 1:2.2 or 1:2.4, determined by 1 H NMR spectroscopy and TGA analysis, respectively, indicating that there are more than 2 but less than 3 NIPAM repeat units included by one γ‐CD molecule. This finding opens new avenues to PPR‐based supramolecular polymers to be used as solid, stimuli‐responsive materials.