Results 201 to 210 of about 14,052,002 (251)

Synthesis and properties of poly (N-isopropylacrylamide) and poly (N-isopropylacrylamide-co-acrylamide) hydrogels

Journal of Shanghai University (English Edition), 2005
The thermosensitive poly (N-isopropylacrylamide) (PNIPAAm) and poly (N-isopropylacrylamide-co-acrylamide) [poly (NIPAAm-co-AAm)] hydrogels with different acrylamide molar percentage are prepared by radiation polymerization using Co60 γ-ray. Their swelling equilibrium data in the media of deionized water, NaCl aqueous solutions and different pH buffer ...
Yong Pei, Jie Chen, Li-ming Yang, Li-li Shi, Hao-jie Luo   +4 more
openaire   +1 more source

Swelling kinetics of poly(N-isopropylacrylamide) gel

Journal of Controlled Release, 1998
In many gel applications the swelling and shrinking kinetics are very important, e.g. in controlled/slow release, where the kinetics determined the rate of out-diffusion of the active component, and in gel extraction where the gel is swollen and shrunk several times.
M, Andersson, A, Axelsson, G, Zacchi
openaire   +2 more sources

Thermoresponsive Gelation Behavior of Poly(N-Isopropylacrylamide)-Block-Poly(N-Vinylpyrrolidone)-Block-Poly(N-Isopropylacrylamide) Triblock Copolymers

European Polymer Journal, 2014
Abstract In this contribution, we reported the synthesis of poly(N-isopropylacrylamide)- block -poly(N-vinylpyrrolidone)- block -poly(N-isopropylacrylamide) (PNIPAM- b -PVP- b -PNIPAM) triblock copolymers through sequential reversible addition–fragmentation chain transfer/macromolecular design via the interchange of xanthate (RAFT/MADIX) process ...
Sixun Zheng, Houluo Cong
exaly   +2 more sources

Micellization and Phase Transition Behavior of Thermosensitive Poly(N-Isopropylacrylamide)–Poly(ɛ-Caprolactone)–Poly(N-Isopropylacrylamide) Triblock Copolymers

Polymer, 2008
Abstract Thermosensitive triblock copolymers with two hydrophilic poly( N -isopropylacrylamide) blocks flanking a central hydrophobic poly(ɛ-caprolactone) block were synthesized by atom transfer radical polymerization. Core-shell micellization of the triblock copolymers was inferred from the 1 H NMR spectra derived in two different solvent ...
Yun-Long Wu, Xian Jun Loh, Fujian Xu
exaly   +2 more sources

Characterization of Poly(N-isopropylacrylamide) and Magnetic Poly(N-isopropylacrylamide) Latexes

2009
Monodisperse poly(N-isopropylacrylamide) (PNIPA) nanogel latexes with temperature and magnetic field sensitivity were prepared and characterized. The phase transition of the latex was characterized by dynamic light scattering. Electrokinetic measurements revealed that the particles have a negative surface charge, which depends on the pH of the swelling
Árpád Némethy, András Szilágyi, Genovéva Filipcsei, Etelka Tombácz, Miklós Zrínyi   +4 more
openaire   +1 more source

The viscosity of dilute poly(N-isopropylacrylamide) dispersions

Journal of Colloid and Interface Science, 2011
The viscosity of dilute aqueous dispersions of poly(N-isopropylacrylamide) microgel particles is measured by capillary viscometry. The viscosity increases with particle mass fraction and on reducing temperature, particularly below the volume phase transition temperature (VPTT) of 32 °C.
Anya J, Howe, Andrew M, Howe, Alexander F, Routh   +2 more
openaire   +2 more sources

Aggregation behavior of poly(N-isopropylacrylamide) microspheres

Colloids and Surfaces B: Biointerfaces, 2001
Electrophoretic mobility and aggregation in suspensions of three types of microspheres (Ms 1, Ms 2 and Ms 3) are studied at different pH, ionic strengths and temperatures of the medium. Here Ms 1 is a core particle composed of poly(N-isopropylacrylamide-co-styrene). Ms 2 is a core-shell microsphere consisting of Ms 1 as the particle core covered with a
K, Makino, H, Kado, H, Ohshima
openaire   +2 more sources

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 ...
Lopez-Leon, Teresa, Bastos-Gonzalez, Delfina, Ortega-Vinuesa, Juan Luis, Elaissari, Abdelhamid   +3 more
openaire   +2 more sources

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
openaire   +1 more source

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 ...
Sayil, Cigdem, Okay, Oguz
openaire   +2 more sources