0000000000340389

AUTHOR

G. Przybytniak

showing 4 related works from this author

E-beam cross-linking of LDPE-OMMT nanocomposites and their photo-oxidation behaviour

2010

polymer nanocompositephoto-chemical ageingclay
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High-energy radiation processing, a smart approach to obtain PVP-graft-AA nanogels

2014

Abstract Poly(N-vinylpyrrolidone)-grafted-acrylic acid biocompatible nanogels (NGs) were prepared using an exiting industrial-type electron accelerator and setups, starting from semi-dilute aqueous solutions of a commercial PVP and the acrylic acid monomer. As a result, NGs with tunable size and structure can be obtained quantitatively. Sterility was also imparted at the integrated dose absorbed. The chemical structure of the NGs produced was confirmed through Fourier Transformer Infrared Spectroscopy (FT-IR). The molecular and physico-chemical properties of NGs, such as the hydrodynamic dimensions and surface charge densities, for various polymer and monomer concentrations in the irradiate…

chemistry.chemical_classificationPoly(N-vinylpyrrolidone) Acrylic acid grafting Nanogels E-beam irradiationRadiationMaterials scienceAqueous solutionAbsorption spectroscopyInfrared spectroscopyPolymerchemistry.chemical_compoundMonomerchemistryChemical engineeringPolymer chemistrySettore CHIM/07 - Fondamenti Chimici Delle TecnologieSurface chargeSpectroscopyPoly(N-vinylpyrrolidone); acrylic acid grafting; nanogels; e-beam irradiation.Acrylic acidRadiation Physics and Chemistry
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Influence of the e-beam irradiation and photo-oxidation aging on the structure and properties of LDPE-OMMT nanocomposite films

2012

Abstract In this paper two systems, polyethylene (LDPE) and polyethylene/commercial organo-modified montmorillonite (LDPE/OMMT) nanocomposite, were subjected to e-beam irradiation at different doses and both the molecular modifications and mechanical properties have been investigated through solubility, FT-IR, calorimetric and tensile tests. Moreover, in some of the irradiated systems photo-oxidation aging was performed and its effects were studied. The results show an enhancement with irradiation of the positive effect of the nano-filler loading, related to the increase of the mechanical properties, due to the increase of the nano-filler polymer interaction. Nevertheless calorimetric and F…

RadiationMaterials scienceNanocompositeLDPE-OMMT nanocomposite film e-beam irradiation Photo-oxidation ageing Mechanical properties Carbonyl index Molecular modificationPolyethylenechemistry.chemical_compoundLow-density polyethyleneSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiMontmorillonitechemistryPolymer chemistryUltimate tensile strengthSettore CHIM/07 - Fondamenti Chimici Delle TecnologieIrradiationComposite materialE beam irradiationSolubilityRadiation Physics and Chemistry
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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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