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Cooperative Hydration, Chain Collapse, and Flat LCST Behavior in Aqueous Poly(N-isopropylacrylamide) Solutions
Abstract
Phase diagrams with very flat LCST phase separation line for aqueous poly( N -isopropylacrylamide) (PNIPAM) solutions are theoretically derived on the basis of sequential hydrogen bond formation between polymer chains and water molecules (cooperative hydration) and compared with experimental spinodal curves. The two-phase region systematically changes its shape with the cooperativity parameter σ, and the spinodals turned out to be almost independent of the polymer molecular weight for strongly cooperative hydration (small σ) as observed in PNIPAM solutions. Hydration takes place sharply within a very narrow temperature region. The number of hydrogen-bonded water molecules on a chain is calculated as a function of the temperature and the polymer concentration.
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Cites
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Theory of solvation-induced reentrant phase separation in polymer solutions
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Self-citationSolution behavior of polyethylene oxide in water as a function of temperature and pressure
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Stimuli-responsive polymers and their applications
Wei, M., Gao, Y., Li, X., & Serpe, M. J. (2017) · Polymer Chemistry · doi:10.1039/c6py01585a · Cited by 1,298
Poly(N‐isopropylacrylamide) Phase Diagrams: Fifty Years of Research
Halperin, A., Kröger, M., & Winnik, F. M. (2015) · Angewandte Chemie International Edition · doi:10.1002/anie.201506663 · Cited by 1,083
Qiu, X.-P., Tanaka, F., & Winnik, F. M. (2007) · Macromolecules · doi:10.1021/ma071359b · Cited by 320
Self-citationA review of polypeptide-based polymersomes
Zhao, L., Li, N., Wang, K., Shi, C., Zhang, L., & Luan, Y. (2014) · Biomaterials · doi:10.1016/j.biomaterials.2013.10.063 · Cited by 149
Metadata
- Authors
- Okada, Y., & Tanaka, F.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-04-20
- Volume
- 38
- Issue
- 10
- Pages
- 4465-4471
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W1994018222
- Cited by
- 405
- References
- 9
- FWCI
- 8.19
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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