Results 231 to 240 of about 29,427 (254)

Glucose sensitive poly (N-isopropylacrylamide) microgel based etalons

Analytical and Bioanalytical Chemistry, 2012
Thermoresponsive microgels have been shown to be an excellent platform for designing sensor materials. Recently, poly (N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgel based etalon materials have been described as direct sensing materials that can be designed to have a single, unique color.
Courtney D, Sorrell, Michael J, Serpe
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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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Guanidinylated allylamine-N-isopropylacrylamide copolymer nonviral transgene vectors

International Journal of Pharmaceutics, 2007
N-Isopropylacrylamide and allylamine copolymers (PNIALM) were prepared by radical polymerization method. To endow them with arginine-like cell membrane penetrating function, the aminos in PNIALMs were transformed to guanidinium groups by chemical modification. The formation and guanidinylation PNIALM were confirmed by NMR; the composition of copolymers
Bingqi, Zhang, Weihang, Ji, Wenguang, Liu, Kangde, Yao   +3 more
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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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Properties of Poly(N-isopropylacrylamide)-Grafted Colloidal Silica

Journal of Colloid and Interface Science, 2000
Poly(N-isopropylacrylamide-co-3-trimethoxysilylpropyl methacrylate) was prepared by radical polymerization and was grafted onto the surface of spherical colloidal silica. The copolymer, which had on average 1 silyl group per chain, condensed on the silica dispersed in THF at 60 degrees C. The resulting particles had a critical coagulation concentration
, Liu, , Pelton, , Hrymak
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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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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
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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 ...
Houluo Cong, Jingang Li, Lei Li, Sixun Zheng   +3 more
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Vibrational heat capacity of Poly(N-isopropylacrylamide)

Polymer, 2015
Abstract The heat capacity of poly(N-isopropylacrylamide) (PNIPA) has been measured from (1.8–460) K using a quantum design PPMS (Physical Property Measurement System) and differential scanning calorimeters. The low-temperature experimental heat capacity below the glass transition temperature 415 K (141.85 °C) was linked to the vibrational molecular ...
A. Czerniecka-Kubicka, I. Zarzyka, J. Schliesser, B.F. Woodfield, M. Pyda   +4 more
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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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