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Cloud point of poly( N ‐isopropylacrylamide) synthesized in the presence of cyclodextrin
Author(s) -
Han Seung Jun,
Yoo Mi Kyong,
Sung Yong Kiel,
Lee Young Moo,
Cho Chong Su
Publication year - 1998
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.1998.030190801
Subject(s) - poly(n isopropylacrylamide) , cyclodextrin , aqueous solution , cloud point , polymerization , polymer chemistry , chemistry , proton nmr , lower critical solution temperature , copolymer , materials science , stereochemistry , organic chemistry , polymer
Polymerization of N ‐isopropylacrylamide (NIPAAm) was performed in the presence of β‐cyclodextrin (β‐CD) [or hydroxypropyl‐β‐cyclodextrin (HOP‐β‐CD)]. The formation of an inclusion complex between PNIPAAm and β‐CD was confirmed by FT‐IR, 1 H NMR and 2D‐NOESY NMR. It was found that the cloud point (CP) of poly( N ‐isopropylamide) (PNIPAAm) in the PNIPAAm/β‐CD complex in aqueous solution increased up to about 57°C whereas that in the PNIPAAm/β‐CD blend is about 33°C. The CP of PNIPAAm in the PNIPAAm/β‐CD complex is higher than that in the PNIPAAm/HOP‐β‐CD inclusion complex. IR and NMR results suggest that PNIPAAm chains are included in CD cavities.