Search results for "PVD"

showing 8 items of 18 documents

A Study on the Measurement Instrumentation for a Custom-Made Bipendulum Impact Testing Machine

2008

Experimental investigations of structures under impact loads are normally carried out by means of drop-weight testing rigs, which are often tailor made, and require sensors for fast transient measurement of mechanical quantities (namely, force, displacement, velocity, and absorbed energy). Since these tests are quite expensive, time consuming, and, often, not repeatable, the sensors must provide reliable and interpretable results in the first trial. In this paper, a thorough study on the measurement instrumentation suitable to carry out reliable low-velocity impact tests by means of a custom-made bipendulum impact testing machine is presented. Attention has been focused on the choice of the…

Piezoelectric transducersComputer scienceImpact measurements; Instrumented impact testing; Optical velocity sensors; PVDF force sensors; Piezoelectric transducers; Transient measurementsImpact measurementsMechanical engineeringAccelerometerLoad cellFriction lossDynamic load testingTransducerOptical velocity sensorsElectronic engineeringCalibrationPVDF force sensorsTransient measurementsInstrumentation (computer programming)Electrical and Electronic EngineeringImpactInstrumentationInstrumented impact testing
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Utilization of Poly(vinylchloride) and Poly(vinylidenefluoride) as Macroinitiators for ATRP Polymerization of Hydroxyethylmethacrylate. Electroanalyt…

2015

The utilization of poly(vinylchloride) (PVC) and poly(vinylidenefluoride) (PVDF) as macroinitiators for atom transfer radical polymerization (ATRP) of hydroxyethylmethacrylate (HEMA) was studied performing electroanalytical investigations and “grafting from” experiments in order to achieve information on the possibility of modifying such commercial polymers by this controlled free radical polymerization technique. This study was performed changing various operating parameters such as the nature of the copper salt, the ligand, the solvent, the temperature and the reaction time. Electroanalytical data suggest that PVC can be easily activated by both CuCl/ Tris(2-pyridylmethyl)amine (TPMA) and…

Polymers and PlasticsOrganic ChemistryPVDF(Hydroxyethyl)methacrylateATRPPVCchemistry.chemical_compoundchemistryPolymerizationElectroanalytical measurementPolymer chemistryMaterials ChemistryCopolymergrafting from
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SVILUPPO DI UN SISTEMA DI ENERGY HARVESTING DALLA PIOGGIA

2014

Settore ING-IND/31 - ElettrotecnicaEnergy Harvesting Piezoelectric transducers PVDF
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HARVESTING DALLE PRECIPITAZIONI

2013

Settore ING-IND/31 - ElettrotecnicaEnergy harvesting piezoelectric materials PVDF
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ENERGIA ELETTRICA DALLE PRECIPITAZIONI

2013

Settore ING-IND/31 - Elettrotecnicaenergy harvesting piezoelectric materials PVDF.
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Study of Atrp Process for the Grafting of Vinyl Monomers on PVC and PVDF

2014

STUDY OF ATRP PROCESS FOR THE GRAFTING OF VINYL MONOMERS ON PVC AND PVDF Sonia Lanzalaco, Onofrio Scialdone, Alessandro Galia, Rosalia Mauro, Flavia Lazzano Dipartimento di Ingegneria Chimica, Gestionale, Informatica, Meccanica, Viale delle Scienze, Palermo e-mail: sonia.lanzalaco@unipa.it ATRP (atom transfer radical polymerization) has been recently used to prepare graft copolymers with regularly-spaced polymer chains from polymeric macroinitiators that have pendant chemical groups containing radically transferable halogen atoms [1]. The halogen atom serves as initiation site for the polymerization of side chains. Furthermore, Matyjaszewsky and Gennaro showed that an externally applied ele…

atom transfer radical polymerization PVDF PVC
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Transport of amino acids through liquid membranes supported on novel poly(vinylidenefluoride) porous flat-sheet matrix

1997

Flat-sheet membranes from poly(vinylidenefluoride) (PVDF) were prepared by the phase inversion process. LiCl was used as a modifying agent. The porosity, maximum pore size and LEPW (liquid entry pressure of water) were determined. Three types of these membranes were tested as a support for n-decanol supported liquid membranes (SLM). Transport of eight amino acids, selected to cover a wide variety of side chains, and of phenylalanine methyl ester through n-decanol SLM were studied. The ability of amino acids to permeates through these membranes depends on the type of flat-sheet PVDF used as a support. An increase in porosity and pore size of the microporous matrix resulted in an increase of …

chemistry.chemical_classificationGeneral Chemical EngineeringGeneral ChemistryMicroporous materialPVDF flat-sheetAmino acidMatrix (chemical analysis)membrane stabilityMembraneFlux (metallurgy)chemistryChemical engineeringSide chainOrganic chemistrysupported liquid membranePhase inversion (chemistry)amino acids transportPorosity
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Modification of PVDF nanoparticles by controlled free radical graft copolymerization in supercritical carbon dioxide

2014

PVDF (polyvinylidenefluoride) membranes are widely used in microfiltration (MF) and ultrafiltration (UF) due to their excellent processability, chemical resistance, well-controlled porosity, and good thermal properties [1]. Moreover this polymer is also frequently adopted in bio-medical devices owing to its good biocompatibility [2]. On the other hand, the use of PVDF membranes in biomedical applications is limited to some extent by the hydrophobicity of their exposed area, which mainly arises from the nature of the pore surface. Prompted by these considerations in the present work we have studied the modification of PVDF nanoparticles with hydroxyethylmethacrylate (HEMA) thus obtaining a m…

pvdf nanoparticles supercritical carbon dioxide
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