Please use this identifier to cite or link to this item:
Title: Effect of mixed solvents on characteristics of poly(N-isopropylacrylamide) gels
Authors: Zhang, X.-Z.
Yang, Y.-Y.
Chung, T.-S. 
Issue Date: 2-Apr-2002
Citation: Zhang, X.-Z., Yang, Y.-Y., Chung, T.-S. (2002-04-02). Effect of mixed solvents on characteristics of poly(N-isopropylacrylamide) gels. Langmuir 18 (7) : 2538-2542. ScholarBank@NUS Repository.
Abstract: A novel technique is proposed to modulate the matrix structure of poly(N-isopropylacrylamide) (PNIPAAm) hydrogel by using water and tetrahydrofuran as a mixed solvent during its polymerization and cross-linking reaction. SEM micrographs revealed that the resulting PNIPAAm hydrogels were highly porous and that the pores within the matrixes were interconnected. In addition, the hydrogels, especially those prepared in the mixed solvent with a high tetrahydrofuran content, were opaque. This indicates that the hydrogels exhibited heterogeneous structures. The porous and heterogeneous structures enabled the hydrogels to absorb large amounts of water and improved their temperature sensitivity. Interestingly, the heterogeneous hydrogels also exhibited very rapid deswelling as well as reswelling kinetics. The DSC thermograms showed that the hydrogels prepared with higher tetrahydrofuran contents had slightly greater LCSTs and enthalpies, which accounts for the increased deswelling rates. The structures and properties of the heterogeneous hydrogels were modulated by varying the tetrahydrofuran content in the mixed solvent.
Source Title: Langmuir
ISSN: 07437463
DOI: 10.1021/la011410j
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Oct 16, 2018


checked on Oct 16, 2018

Page view(s)

checked on Jul 27, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.