Search results for "NMR spin-lattice relaxation"

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Studies of network organization and dynamics of e-beam crosslinked PVPs: From macro to nano

2012

Abstract In this work the influence of poly(N-vinyl pyrrolidone) (PVP) concentration in water on the organization and dynamics of the corresponding macro-/nanogel networks has been systematically investigated. Irradiation has been performed at the same irradiation dose (within the sterilization dose range) and dose rate. In the selected irradiation conditions, the transition between macroscopic gelation and micro-/nanogels formation is observed just below the critical overlap concentration (∼1 wt%), whereas the net prevalence of intra-molecular over inter-molecular crosslinking occurs at a lower polymer concentration (below 0.25 wt%). Dynamic–mechanical spectroscopy has been applied as a cl…

chemistry.chemical_classificationRadiationMaterials scienceAqueous solutionNMR spin–lattice relaxationSpin–lattice relaxationNanogelsPolymerDynamic mechanical analysise-Beam irradiation; PVP aqueous solutions; Nanogels; Dynamic mechanical spectroscopy; NMR spin–lattice relaxationDynamic mechanical spectroscopyNanogelPVP aqueous solutionsPolymerizationChemical engineeringchemistryNano-Polymer chemistrye-Beam irradiationElectron beam processingPVP aqueous solutionSettore CHIM/07 - Fondamenti Chimici Delle TecnologieNMR spin-lattice relaxationNanogelRadiation Physics and Chemistry
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