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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Ionic liquid modifies the lower critical solution temperature (LCST) of poly(N-isopropylacrylamide) in aqueous solution.
TL;DR: The results unambiguously reveal that the imidazolium based IL significantly affected the phase transition of PNIPAM and ruptured the hydrogen bonding between polymer and water molecules, and eventually the hydrated macromolecule structure was destabilized.
Journal ArticleDOI
Thermosensitive Phase-Separation Behavior of Poly(acrylic acid)-graft-poly(N,N-dimethylacrylamide) Aqueous Solution
Tetsuo Shibanuma,Takashi Aoki,Kohei Sanui,Naoya Ogata,Naoya Ogata,Akihiko Kikuchi,Yasuhisa Sakurai,Teruo Okano +7 more
TL;DR: In this paper, graft copolymers were synthesized by free radical copolymerization of AAc with PDMAAm macromonomer, and they were shown to be water-soluble at lower temperatures, while they showed a liquid−liquid phase separation from water above the characteristic transition temperatures.
Journal ArticleDOI
Dual thermo-responsive and ion-recognizable monodisperse microspheres
TL;DR: In this article, a novel type of dual stimuli-responsive microspheres that simultaneously exhibit ion-recognition property based on the supramolecular host-guest complexation of crown ether receptors (benzo-18-crown-6-acrylamide) with specific ions and thermo-sensitivity was fabricated.
Journal ArticleDOI
Extraction-like removal of organic dyes from polluted water by the graphene oxide/PNIPAM composite system
Meiwen Cao,Shen Yang,Zengshuai Yan,Wei Qiang,Tifeng Jiao,Yutan Shen,Yuchun Han,Yilin Wang,Shengjie Wang,Yongqing Xia,Tongtao Yue +10 more
TL;DR: In this article, a novel GO/PNIPAM composite system that has been rationally designed for removal of organic dyes from polluted water in a new mechanism, that is, an extraction-like mechanism.
Journal ArticleDOI
Temperature sensitization of liposomes using copolymers of N-isopropylacrylamide.
TL;DR: The close relationship between lower critical solution temperatures of thepolymers and temperature regions where enhancement of the release from the polymer-fixed liposomes demonstrates that the release was triggered by alteration of the polymers from a hydrophilic state to a Hydrophobic state occurring at their lowercritical solution temperatures.
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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