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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Liquid-liquid two-phase systems for the production of porous hydrogels and hydrogel microspheres for biomedical applications: A tutorial review.
TL;DR: In this review, the history, terminology and classification of liquid-liquid two-phase polymerization and crosslinking are described and Instructive examples of hydrogel microsphere and macroporous scaffold formation by precipitation/dispersion, emulsion and suspension polymerizations are used to illustrate the nature of these processes.
Journal ArticleDOI
Synthesis and characterization of pH-responsive copolymer microgels with tunable volume phase transition temperatures
Justin D. Debord,L. Andrew Lyon +1 more
Journal ArticleDOI
Comprehensive and Accurate Control of Thermosensitivity of Poly(2-alkyl-2-oxazoline)s via Well-Defined Gradient or Random Copolymerization
Joon Sik Park,Kazunori Kataoka +1 more
TL;DR: In this article, the lower critical solution temperature (LCST) of poly(2-alkyl-2-oxazoline)s (POx) was precisely tuned over a broad range of temperatures via the well-defined gradient or random copolymerization between 2-n-propyl-1-ox-azoline (nPrOx) and either 2-isopropyl- 2-oxoxylate (iPr Oxazoline), or 2-ethyl-2oxoxoline (EtOx), resulting in an extremely narrow molecular weight
Journal ArticleDOI
Control of cell cultivation and cell sheet detachment on the surface of polymer/clay nanocomposite hydrogels.
TL;DR: Cell cultivation on the surface of a novel poly(N-isopropylacrylamide) (PNIPA) hydrogel (N-NC gel), consisting of a specific type of organic (PNipA)/inorganic (clay) network, was studied using three cell types.
Journal ArticleDOI
Synthesis and thermoassociative properties in aqueous solution of graft copolymers containing poly(N-isopropylacrylamide) side chains
Alain Durand,Dominique Hourdet +1 more
TL;DR: In this article, the self-aggregation behavior induced by heating of the poly(N-isopropylacrylamide) (PNIPA)/water binary system was investigated.
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
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Thermodynamics of polyisobutylene-n-alkane systems
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