Search results for "Flow curve"

showing 3 items of 3 documents

A simple interpretation of the effect of the polymer type on the properties of PMBs for road paving applications

2018

Abstract The paper presents the results of the rheological characterisation of polymer-modified bitumen for paving applications. In order to find a simple interpretation of the influence of polymer type on the blends produced, in this study high density and low density polyethylene (PE) with different chemical properties were used, as well as ethylene-vinyl acetate. The chemical characteristics of the base bitumen and the polymers used were determined by means of SARA analysis and Fourier Transform Infrared Spectroscopy, FTIR, respectively. The morphology of the produced blends was investigated by means of fluorescent light optic microscopy, while the mechanical properties were investigated…

Materials sciencePolymer crystallinity0211 other engineering and technologies02 engineering and technologyCrystallinityViscosityRheology021105 building & constructionSettore ICAR/04 - Strade Ferrovie Ed AeroportiGeneral Materials ScienceFourier transform infrared spectroscopyComposite materialCivil and Structural Engineeringchemistry.chemical_classificationPolarityBuilding and ConstructionDynamic mechanical analysisPolymer021001 nanoscience & nanotechnologyShear rateLow-density polyethyleneSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryPolymer modified bitumenFlow curveMaterials Science (all)Road application0210 nano-technologyConstruction and Building Materials
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Processability and Properties of Re-Graded, Photo-Oxidized Post-Consumer Greenhouse Films

2005

The recycling of post‐consumer plastics leads, in general, to secondary materials having properties worse than those of the reclaimed material and certainly worse than those of the same virgin polymer. This is because of the degradation undergone by the objects during their use and because of the thermo‐mechanical degradation undergone during the reprocessing operations. The change of the molecular architecture is responsible for this worsening of properties. The use of stabilizing systems can slow the degradation during the melt processing but cannot give any improvement of the final properties of the material. In order to enhance the properties of the recycled plastics, some rebuilding of…

chemistry.chemical_classificationMaterials scienceFlow curvePolymers and PlasticsGeneral Chemical EngineeringOrganic ChemistryPolymermechanical properties post‐consumer greenhouse films processability regradation rheological propertiesBranching (polymer chemistry)Molten statechemistryRheologyMaterials ChemistryMolar mass distributionExtrusionPolymer blendComposite materialMacromolecular Materials and Engineering
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Re-gradation of Photo-oxidized Post-consumer Greenhouse Films

2005

The degradation undergone by the polymers during their use and because of the thermo-mechanical degradation undergone during the reprocessing operations provokes, among other effects, the decrease of the molecular weight. The change of the molecular architecture is responsable for the deterioration of all the properties. In order to restore the properties of post-consumer recycled plastics, some rebuilding of the molecular structure is necessary. In this work, photo-oxidized films for greenhouses were reprocessed in presence of additives able to react with the polyethylene in order to form branching and cross-linking, improving the properties of these post-consumer plastic.

chemistry.chemical_classificationMaterials scienceFlow curvePolymers and PlasticsOrganic ChemistryGreenhousePolymerPolyethylenechemistry.chemical_compoundChemical engineeringchemistryPolymer chemistryMaterials ChemistryGradationPolymer blend
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