Results 161 to 170 of about 10,074 (199)

Poly(N-isopropylacrylamide) (PNIPAM) is never hydrophobic

Journal of Colloid and Interface Science, 2010
PNIPAM chains have hydrophobic and hydrophilic domains below and above the LCST. Temperature dependent interactions between PNIPAM and solutes arise because of changes in the local environment around the hydrophobic isopropyl domains. Below the LCST the isopropyl groups are surrounded by water, whereas above the LCST the hydrophobic groups are in ...
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Solution Properties of Poly(N-isopropylacrylamide)

Journal of Macromolecular Science: Part A - Chemistry, 1968
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.
M. Heskins, J. E. Guillet
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Rheological characterization of the thermal gelation of poly(N-isopropylacrylamide) and poly(N-isopropylacrylamide)co-Acrylic Acid

2009
Applied ...
FILIPE E. ANTUNES, LUIGI GENTILE, LORENA TAVANO, OLIVIERO ROSSI, Cesare   +3 more
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Manipulating the thermoresponsive behaviour of poly(N-isopropylacrylamide) 3. On the conformational behaviour of N-isopropylacrylamide graft copolymers

Soft Matter, 2009
The thermally triggered conformational change of poly(N-isopropyl acrylamide), PNIPAM, in aqueous media occurs at the lower critical solution temperature, LCST. Manipulation of the switch can be achieved via simple free radical copolymerisation, for example.
Choong-Kooi Chee, Barry J. Hunt, Stephen Rimmer, Ramune Rutkaite, Ian Soutar, Linda Swanson   +5 more
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Macroporous poly(N-isopropylacrylamide) networks

Polymer Bulletin, 2002
Summary Effects of the gel preparation temperature Tprep and the initial monomer concentration c on the swelling and the porosity properties of poly(N-isopropylacrylamide) (PNIPA) networks are described. PNIPA networks were prepared by free-radical crosslinking copolymerization of N-isopropylacrylamide and N,N’-methylene(bis)acrylamide (BAAm) in ...
Cigdem Sayil, Oguz Okay
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Dextran permeation through poly(N-isopropylacrylamide) Hydrogels

Journal of Biomaterials Science, Polymer Edition, 1994
The permeation of macromolecules such as fluoroescein-labeled dextran fractions through thermally reversible hydrogels has been investigated. A permeation model has been formulated, which takes into account hydrogel porosity and tortuosity as well as the combined effect of a geometric restraint for a relatively large solute molecule at a pore entrance ...
L C, Dong, A S, Hoffman, Q, Yan
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Salt Effects in the Cononsolvency of Poly(N‐isopropylacrylamide) Microgels

ChemPhysChem, 2010
AbstractPoly(N‐isopropylacrylamide) (PNIPAM) is well known to exhibit reentrant behavior or cononsolvency in response to the composition of a mixed solvent consisting of water and a low‐chain alcohol. Since the solvent structure plays an important role in this phenomenon, the presence of structure‐breaking/structure‐making ions in solution is expected ...
Teresa, López-León, Delfina, Bastos-González, Juan Luis, Ortega-Vinuesa, Abdelhamid, Elaïssari   +3 more
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Effects of thermosensitive poly(N-isopropylacrylamide) on blood coagulation

Journal of Materials Chemistry B, 2016
Thermosensitive poly( N -isopropylacrylamide) (PNIPAM), hydrophilic below its lower critical solution temperature (LCST) of 32 °C and hydrophobic above it, has been widely used as a drug and gene delivery system with intelligent temperature-responsivity.
Yi, Zhang, Jianzhou, Cai, Chenghua, Li, Jianye, Wei, Zonghua, Liu, Wei, Xue   +5 more
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Diffusion of glucose and insulin in a swelling N-isopropylacrylamide gel

International Journal of Pharmaceutics, 1997
The diffusional characteristics for poly(N-isopropylacrylamide) (NiPAAm) gel have been investigated. This gel is a critical gel which means that small changes in the environment influence the gel volume considerably. The effective diffusion coefficients for the solutes glucose and insulin were determined in batch experiments with the solutes diffusing ...
, Andersson, , Axelsson, , Zacchi
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Cytocompatible Performance of Thermosensitive Poly(N-Isopropylacrylamide) Nanoparticles

Journal of Biomaterials Science, Polymer Edition, 2012
The development of biomedical materials with biocompatibility, especially cytocompatibility, is the frontal research field for material science, biology, medicine, pharmacology and related interdisciplines. We have successfully synthesized a new biomedical material, PNIPAM-g-P(NIPAMco-St) (PNNS) core-shell nanoparticles, and investigated its ...
Guo-Hui, Zhang, Yi, Fang, Jian, Shen, Chun, Mao, Xiao-Hua, Huang   +4 more
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