Journal ArticleDOI
Solution Properties of Poly(N-isopropylacrylamide)
M. Heskins,J. E. Guillet +1 more
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TLDR
In this paper, a lower critical solution temperature of poly(N-isopropyl acrylamide was found to be due to an entropy effect, which was attributed to the formation of nonpolar and intermolecular hydrogen bonds.Abstract:
Aqueous solutions of poly(N-isopropyl acrylamide) show a lower critical solution temperature. The thermodynamic properties of the system have been evaluated from the phase diagram and the heat absorbed during phase separation and the phenomenon is ascribed to be primarily due to an entropy effect. From viscosity, sedimentation, and light-scattering studies of solutions close to conditions of phase separation, it appears that aggregation due to formation of nonpolar and intermolecular hydrogen bonds is important. In addition, a weakening of the ordering effect of the water-amide hydrogen bonds as the temperature is raised contributes to the stability of the two-phase system.read more
Citations
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Temperature Induced Volume-Phase Transitions in Surface-Tethered Poly(N-isopropylacrylamide) Networks
TL;DR: In this paper, the swelling behavior of a surface-tethered poly(N-isopropylacrylamide) (polyNIPAAm) network in D2O was characterized with neutron reflection and compared to the demixing behavior of linear poly(nipaa) in solution.
Journal ArticleDOI
Thermoresponsive polymer brush surfaces with hydrophobic groups for all-aqueous chromatography
Kenichi Nagase,Mio Kumazaki,Hideko Kanazawa,Jun Kobayashi,Akihiko Kikuci,Yoshikatsu Akiyama,Masahiko Annaka,Teruo Okano +7 more
TL;DR: Results indicated that the copolymer-brush-grafted surface prepared by ATRP was an effective tool for separating hydrophilic analytes at low temperature through modulating the strong hydrophobic interaction.
Journal ArticleDOI
Hydrogel-driven paper-based microfluidics
Robert R. Niedl,Carsten Beta +1 more
TL;DR: It is demonstrated that multi-step sequences of chemical reactions can be implemented in a paper-based system and operated without the need for external precision pumps.
Journal ArticleDOI
Characterization of Cyanine Dye-Labeled Poly(N-isopropylacrylamide) Core/Shell Microgels Using Fluorescence Resonance Energy Transfer
TL;DR: In this paper, the swelling behavior of the core component in poly(N-isopropylacrylamide) (pNIPAm) core/shell microgels was investigated via fluorescence resonance energy transfer (FRET).
Journal ArticleDOI
Synthesis and Properties of Ionically Modified Polymers with LCST Behavior
TL;DR: In this paper, free radical copolymerization of N-isopropylacrylamide (NIPAM) with various cationic, anionic, and amphoteric comonomers, resulting in products with comparable molecular masses and charge concentrations.
References
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Mouvement Brownien d'un ellipsoide (II). Rotation libre et dépolarisation des fluorescences. Translation et diffusion de molécules ellipsoidales
TL;DR: In this article, the diffusion of molecules ellipsoidales dissoutes is analyzed in a mouvement brownien d'ensemble (rotation and translation) with respect to a set of molecules.
Journal ArticleDOI
The thermodynamic properties of aqueous solutions of polyethylene glycol, polypropylene glycol and dioxane
G. N. Malcolm,J. S. Rowlinson +1 more
Journal ArticleDOI
Thermodynamics of polyisobutylene-n-alkane systems
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