Reentrant swelling behavior of thermosensitive N-isopropylacrylamide nano-sized gel particles
- Authors
- Jung, Sang Chul; Oh, Suk Yung; Bae, Young Chan
- Issue Date
- Jul-2009
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Modified double lattice model; Reentrant gel swelling behavior; N-isopropylacrylamide
- Citation
- POLYMER, v.50, no.14, pp.3370 - 3377
- Indexed
- SCIE
SCOPUS
- Journal Title
- POLYMER
- Volume
- 50
- Number
- 14
- Start Page
- 3370
- End Page
- 3377
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/176581
- DOI
- 10.1016/j.polymer.2009.05.011
- ISSN
- 0032-3861
- Abstract
- The closed-loop phase diagram of poly N-isopropylacrylamide (PNIPA) in a water-N,N-dimethyl formamide (DMF) system was measured by thermooptical analysis (TOA). The reentrant swelling behavior of N-isopropylacrylamide (NIPA) nano-sized gel particles in the water-DMF system was measured by using photon correlation spectroscopy (PCS) technique. Theoretically, a modified double lattice model (MDL) can be used to describe the closed-loop phase behavior of linear PNIPA in water-DMF systems. For crosslinked NIPA nano-sized gel particles in a water-DMF system, we combined MDL theory for the mixing contribution and Flory-Erman theory for the elastic contribution. Molecular interaction parameters obtained from the PNIPA solution were used to directly predict the swelling-ratio curves for the NIPA gel. Using our model, the calculated results were in good agreement with the experimental data using only one adjustable parameter.
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