Results 141 to 150 of about 9,399 (192)

Catalytic reduction of aldehydic and nitro groups of nitro-benzaldehyde derivatives by silver nanoparticle-containing smart alginate-poly(<i>N</i>-isopropylacrylamide-methacrylic acid) microgels. [PDF]

RSC Adv
Arif M, Tahir F, Hussain T, Alrokayan S, Akhter T.   +4 more
europepmc   +1 more source

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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, Fu-Jian Xu
exaly   +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
exaly   +2 more sources

The effect of pH on the LCST of poly(N-isopropylacrylamide) and poly(N-isopropylacrylamide-co-acrylic acid)

Journal of Biomaterials Science, Polymer Edition, 2004
Poly(N-isopropylacrylamide) (PNIPAAm) and poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAAm-co-AAc)) hydrogels are synthesized by irradiating the aqueous solutions of NIPAAm and NIPAAm/AAc with 60Co gamma-ray. The effects of pH on the swelling ratio and on the lower critical solution temperature (LCST) are studied by determining the dependence of ...
Yong, Pei, Jei, Chen, Liming, Yang, Lili, Shi, Qiong, Tao, Baojun, Hui, Jian, Li   +6 more
openaire   +2 more sources

Adsorption of poly(N-isopropylacrylamide) on glass substrata

Journal of Colloid and Interface Science, 2004
The adsorption of poly(N-isopropylacrylamide) (PNIPAAM), a well known thermosensitive polymer, on glass was investigated by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The polymer was dissolved in water at low (0.02 g/L) and high (2 g/L) concentration and the tested temperatures were below (25 degrees C) and above (50 ...
Callewaert, M., Grandfils, Christian, Boulange-Petermann, L., Rouxhet, P. G.   +3 more
openaire   +3 more sources

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

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
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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
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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