0000000000548185

AUTHOR

Marek Grzymek

showing 4 related works from this author

Investigation of thermal stability of ethylene copolymers with POSS - Study under static and dynamic conditions

2018

Abstract In the paper there was studied thermal stability of a series of ethylene copolymers with monoalkenylsiloxy- or monoalkenylsilsesquioxanes (POSS) under dynamic and static conditions. The copolymers proved to be more thermally stable than neat polyethylene and neat silsesquioxane comonomers. The kind and the content of the POSS units significantly affected degradation of the copolymers. Thermal oxidation process resulted in structural changes of the (co)polymers as it was evidenced by the variations in the kind and content of carbonyl, as well as by unsaturated end groups. Depending on the structure of the POSS comonomer incorporated into the polymer chain, the silsesquioxane units o…

Thermal oxidationMaterials sciencePolymers and Plastics02 engineering and technology010402 general chemistry01 natural scienceslaw.inventionchemistry.chemical_compoundDegradationEthylenelawMaterials ChemistryCopolymerThermal stabilityCrystallizationchemistry.chemical_classificationThermal oxidationComonomerCopolymersPolymerPolyethylene021001 nanoscience & nanotechnologyCondensed Matter PhysicsPolyhedral oligomeric silsesquioxane (POSS)Silsesquioxane0104 chemical scienceschemistryChemical engineeringMechanics of Materials0210 nano-technologyPolymer Degradation and Stability
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The role of nanoparticles in decreased washout of underwater concrete

2019

Abstract The paper presents research results of the influence of SiO2 nanoparticles on the washout of underwater concrete and hardened concrete. Based on infrared spectroscopy (FTIR) and thermogravimetric (TGA) analyses of the applied anti-washout admixture (AWA), its chemical structure was determined. A beneficial effect of SiO2 nanoparticles on the reduction of the mix washout was demonstrated and the most probable reason for that phenomenon was given, taking into account the AWA chemical structure and its behaviour in the concrete mix environment. It was found that a dosing method of AWA and nanoparticles to the concrete influenced the washout.

Thermogravimetric analysisMaterials sciencefresh concreteChemical structure0211 other engineering and technologiesInfrared spectroscopyWashoutNanoparticle020101 civil engineering02 engineering and technologyBuilding and Construction0201 civil engineeringChemical engineeringfinenessSio2 nanoparticles021105 building & constructionadmixturenanoparticlesGeneral Materials ScienceFourier transform infrared spectroscopyCivil and Structural EngineeringConstruction and Building Materials
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Accelerated laboratory weathering of polypropylene composites filled with synthetic silicon-based compounds

2019

Abstract Non-functionalized and n-alkyl functionalized polyhedral oligomeric silsesquioxanes (POSS), siloxane-silsesquioxane resins and the sol-gel silicas were for the first time examined as possible UV-stabilizers and/or antioxidants in polypropylene (PP). The obtained composites were subjected to the accelerated laboratory weathering tests. The influence of the weathering conditions on the structure and properties of the PP materials was evaluated on the basis of the results from Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) studies. It was found that weathering resistance of the PP materials was strongly de…

Materials sciencePolymers and PlasticsSiliconScanning electron microscopepolyhedral oligomeric silsesquioxanesiloxane-silsesquioxane resinchemistry.chemical_element02 engineering and technology010402 general chemistry01 natural scienceslaw.inventionchemistry.chemical_compoundDifferential scanning calorimetrylawMaterials ChemistryCrystallizationFourier transform infrared spectroscopyPolypropylenechemistry.chemical_classificationPolymer021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical scienceschemistryChemical engineeringMechanics of Materialsaccelerated laboratory weatheringsilica0210 nano-technologyDispersion (chemistry)polypropylenePolymer Degradation and Stability
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Evaluation of wood-polyethylene composites biodegradability caused by filamentous fungi

2017

Abstract This study describes the impact of filamentous fungi on wood-polymer composites (WPCs) containing various types of fillers (coniferous, deciduous, cellulose) in the amount of 30 wt.% to 50 wt.%. The selection of fungal strain of filamentous fungi was performed prior to the study on the impact of the wood type on the progress of WPCs biodegradability. The changes associated with various water absorption of the examined WPCs, were observed using scanning electron microscopy (SEM). The impact of fungal mycelium, which had affected the changes in WPCs material, was examined using thermogravimetric analysis (TG). The results showed, that the growth of mycelium on WPCs, influenced mainly…

Thermogravimetric analysisAbsorption of waterwood-polymer compositeCarbonizationfilamentous fungi02 engineering and technology010501 environmental sciencesengineering.materialBiodegradation021001 nanoscience & nanotechnology01 natural sciencesMicrobiologyBiomaterialschemistry.chemical_compoundchemistryFiller (materials)engineeringAspergillus nigerComposite materialFourier transform infrared spectroscopyCellulose0210 nano-technologyWaste Management and DisposalMycelium0105 earth and related environmental sciencesInternational Biodeterioration & Biodegradation
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