Formation of a polypseudorotaxane via self-assembly of γ-cyclodextrin with poly(N-isopropylacrylamide).
Macromol Rapid Commun
; 33(13): 1143-8, 2012 Jul 13.
Article
em En
| MEDLINE
| ID: mdl-22492506
ABSTRACT
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-, ß-, 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 ß-CD under the same conditions. The ratio of the number of γ-CD molecules to entrapped NIPAM repeat units is kept at 12.2 or 12.4, 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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Polímeros
/
Acrilamidas
/
Rotaxanos
/
Gama-Ciclodextrinas
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article