Journal ArticleDOI
Solution Properties of Poly(N-isopropylacrylamide)
M. Heskins,J. E. Guillet +1 more
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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
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Smart electrospun nanofibers for controlled drug release: recent advances and new perspectives.
Lin Weng,Jingwei Xie +1 more
TL;DR: The mechanisms of various environmental parameters functioning as stimuli to tailor the release rates of smart electrospun nanofibers are reviewed.
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Aqueous Chromatography Utilizing pH-/Temperature-Responsive Polymer Stationary Phases To Separate Ionic Bioactive Compounds
TL;DR: Results show that elution of weakly charged bioactive compounds is readily regulated through the modulation of stationary-phase thermoresponsive hydrophilic/hydrophobic and charge density changes.
Journal ArticleDOI
Reversible Surface Properties of Glass Plate and Capillary Tube Grafted by Photopolymerization of N-Isopropylacrylamide
TL;DR: In this paper, a simple and effective method to modify the surface of glass plate and quartz capillary tube by ultraviolet photopolymerization of N-isopropylacrylamide (NIPAAm) has been developed.
Journal ArticleDOI
Preparation of monodisperse poly(N-isopropylacrylamide) microgel particles with homogenous cross-link density distribution.
TL;DR: The swelling and optical characteristics of the prepared homogenously cross-linked microgel particles were compared to the properties of inhomogenouslyCross- linked microgels prepared by the normal precipitation polymerization method and the degree of swelling of the homogeneous particles is significantly higher than that of the heterogeneousmicrogel particles.
Journal ArticleDOI
Rational design of thermoresponsive polymers in aqueous solutions: A thermodynamics map
TL;DR: In this paper, the authors proposed a thermodynamic map to guide the design of thermoresponsive polymers, which is drawn up based on the enthalpic and entropic contributions (ΔHm and ΔSm) to the free energy change of mixing.
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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