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Cationic Monomer (cationic + monomer)
Selected AbstractsMesoscopic Network Structure of a Semi-Rigid Polyion Complex Nested in a Polycationic HydrogelADVANCED MATERIALS, Issue 46 2009Zi Liang Wu A dual network gel, consisting of a micrometer-scaled network-like structure of a semi-rigid polyion complex nested in a nanometer-scaled polycationic network, has been developed by polymerization of a cationic monomer in the presence of a small amount of semi-rigid polyanion as dopant. Self-assembly and viscoelastic phase separation (see figure) compete with each other during the polymerization and render the micrometer-scaled network structure, which is permanently frozen by the subsequent gelation. [source] Collapse of acrylamide-based polyampholyte hydrogels in waterJOURNAL OF APPLIED POLYMER SCIENCE, Issue 3 2009Saadet Dogu Abstract The swelling behavior of balanced acrylamide (AAm)-based polyampholyte hydrogels in water and in aqueous salt (NaCl) solutions was investigated. Equimolar ratio of the ionic comonomers 4-vinylpyridine (cationic monomer) and acrylic acid (anionic monomer) were used together with the nonionic monomer AAm in the hydrogel preparation. The variations of the hydrogel volume in response to changes in pH were measured. It was found that the hydrogels are in a collapsed state not only at the pH of the isoelectric point pHIEP but also over a wide range of pH including pHIEP. The width of the collapsed plateau increased and the hydrogels assumed a more compact state as the ionic group content is increased. The antipolyelectrolyte behavior was observed along the collapsed plateau region, where the gel occupies a larger volume in salt solution. The experimental swelling data were compared with the predictions of the Flory-Rehner theory of swelling equilibrium including the ideal Donnan equilibria. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 [source] Precipitation polymerization of acrylamide with quaternary ammonium cationic monomer in potassium carbonate solution initiated by plasmaJOURNAL OF APPLIED POLYMER SCIENCE, Issue 6 2007Yangang He Abstract Precipitation polymerization of 2-(methacryloyloxyethyl) trimethyl ammonium chloride (DMC)- co -acrylamide (AM) [poly(AM-DMC)] has been successfully performed in potassium carbonate (K2CO3)-water media by plasma initiation. K2CO3 solution was selected because not only the higher solubility of AM and DMC comparing with that of poly(AM-DMC), but the higher intrinsic viscosity of poly(AM-DMC) could be obtained. A set of experiments was performed using different K2CO3 concentration (from 50 down to 10% (w/w)), thus the precipitation architecture was not obtained below 20% (w/w). And particles size, particles size distribution (7,120 ,m), and intrinsic viscosity of poly(AM-DMC) (ranging up to 455 cm3/g) were also summarized in this article. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 4060,4067, 2007 [source] Bis(1,3,5-triazine-2,4,6-triamine-,N1)silver(I) nitrateACTA CRYSTALLOGRAPHICA SECTION C, Issue 5 2009Al-shima'a A. Massoud The title compound, [Ag(C3H6N6)2]NO3, has an alternating two-dimensional bilayer structure supported by extensive hydrogen bonds. The [Ag(melamine)2]+ cationic monomers (melamine is 1,3,5-triazine-2,4,6-triamine) are connected via N,H...N hydrogen bonds to form two-dimensional sheets. Nitrate groups are sandwiched between two sheets through N,H...O hydrogen bonds. An almost perfectly linear coordination geometry is found for the AgI ions. The triazine ligands are slightly distorted due to ,,, interactions. [source] | ||||||||||