Dorota Czarnecka-Komorowska

Dorota Czarnecka-Komorowska
Poznan University of Technology · Department of Mechanical Eng. Institute of Materials Technology

Professor

About

52
Publications
12,336
Reads
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271
Citations
Introduction
Plastics wastes separations; plastics mechanical recycling and composting: technology; properties-structure relationship: mechanical properties, thermal properties (DSC, TGA), morphology (SEM, PLM) , etc. Polyoxymethylene (POM) modified by POSS nanoparticles.
Additional affiliations
October 1995 - present
Poznan University of Technology
Position
  • dr hab. inż.
Description
  • Plastics Division
October 1995 - August 2017
Poznan University of Technology
Position
  • Professor (Assistant)
Education
October 1990 - June 1995
Poznan University of Technology
Field of study
  • Faculty of Mechanical Eng. and Management

Publications

Publications (52)
Article
Full-text available
The paper presents an analysis of the aluminum porous structure serving as a structural material used in the auto- motive or marine industry. The subject of the research is the analysis of the mechanical properties of the aluminum porous structure, in particular its ability to absorb energy in comparison with quality of manufactured porous structur...
Article
The paper presents the results of the ageing resistance of automotive mudflaps made of recycled polyethylene blends. The mudflaps were manufactured by a plastic sheet extrusion-calendaring process in Novotech Kostrzyn nad Odrą company. The changes of the mechanical properties in the tensile test and impact toughness test as well as in Shore hardnes...
Article
This article describes the technology of organic recycling of polylactide/halloysite biocomposites using the sugar- protein condensation theory. For this purpose, polymer biocomposites were produced with a polylactic acid structure and reinforced in the form of halloysite nanoparticles by 1; 2.5; and 5% by mass. A new method of decomposition of the...
Article
The article presents results on the decomposition of polylactic acid (PLA)/halloysite nanotube (HNT) biocomposites. Experiments were carried out in laboratory conditions simulating composting in the industrial pile using the so-called short degradation method. In this paper, the effects of the composting process (duration from 30 to 90 days) on the...
Article
Simulation codes currently used in the foundry industry are primarily used to predict casting quality, quality tied mainly to the location of defects such as shrinkage (voids of shrinkage origin). The effective use of the simulation system requires identification and knowledge of, adapted to the reality, physical parameters (thermal) of the casting...
Article
Plastics recycling has become a key industry in developed countries, to reduce ecological damage and save non-renewable resources. This paper discusses the concept and the design of electrostatic separator as a test bench for the separation of different plastics in recycling applications. In the automotive recycling process, all these waste materia...
Article
Full-text available
This paper presents the contemporary problems of polymer waste recycling, mainly recycling cables from end-of-life vehicles. The authors developed a new material based on mixed polymer waste (ASR) modified with a ductile polymer, mainly recycled low-density polyethylene (rLDPE), to produce moisture-resistant boards with beneficial mechanical proper...
Article
Full-text available
The aim of this study was to develop a polyethylene/polyamide (R-PE/R-PA) regranulated product made from post-consumer wastes grafted with polyethylene-graft-maleic anhydride (PE-g-MAH) by reactive extrusion in a twin-screw extruder equipped with an external mixing zone. The compatibility effect of PE-g-MAH used as a modifier in R-PE/R-PA blends wa...
Article
Full-text available
Abstract. Many researchers in the developed countries have been intensively seeking effective methods of plastic recycling over the past years. Those techniques are necessary to protect our natural environment and save non-renewable resources. This paper presents the concept of an electrostatic separator designed as a test bench dedicated to the se...
Article
Full-text available
The article presents the results of the research related to the decomposition of polylactic acid (PLA)/halloysite nanotube (HNTs) biocomposites into a simple organic form. After manufacturing the nanocomposites, the evaluation of the composting process simulation was conducted using the biodegradation method. First, the selected properties of PLA/H...
Article
Full-text available
Machines and devices for the production, transport and segregation of products are placed in production and storage rooms. Flat conveyor and drive belts are very often used for their construction. Due to heavy loads and difficult operating conditions, these belts can catch fire and, as a result, become the main source of air contaminants harmful to...
Article
Full-text available
The paper presents the procedure of generating geometrical features on the contours of non-circular pulleys through the selection of materials and technological parameters for easy and efficient production of these parts. Based on the models designed in the computer aided design (CAD) system, several prototype non-standard pulleys were made, which...
Article
Full-text available
The aim of this study was to investigate and analyze the impact of selected parameters during the tribocharging process of shredded poly(ethylene terephthalate) (PET) and high-density polyethylene (PE-HD) plastics on accumulated electric charge and electrostatic separation effectiveness. The accumulation of electric charge on surfaces of polymer pa...
Article
Full-text available
In this research, the quality of manufactured cast metal-ceramic foams (manufactured using blowing gas) was tested. The causes responsible for defect formation in the composite foams and their consequences were analyzed using the FMEA (Failure Mode and Effects Analysis) method, which is a useful tool for minimizing losses caused by low product qual...
Article
Full-text available
The work presented here describes the first results of an effective method of assessing the quality of electrostatic separation of mixtures of polymer materials. The motivation for the research was to find an effective method of mechanical separation of plastic materials and a quick assessment of the effectiveness of the method itself. The proposed...
Article
Full-text available
This article presents the conditions and factors influencing the performance and requirements of brake disc materials. The wear resistance of brake discs must be as high as possible since the reliability of brakes is a fundamental factor affecting the safety of the object in motion. The influence of temperature on the materials was also analyzed, a...
Article
Full-text available
The article presents the potential impact of flat drive and transport belts on people’s safety during a fire. The analysis distinguished belts made of classically used fabric–rubber composite materials reinforced with cord and currently used multilayer polymer composites. Moreover, the products’ multilayers during the thermal decomposition and comb...
Article
Full-text available
This paper presented a new approach to decision making support of defects assessment in metal matrix composites (MMC). It is a continuation of the authors’ papers in terms of a uniform method of casting defects assessment. The idea of this paper was to design an open-access application (follow-up system called Open Atlas of Casting Defects (OACD))...
Article
Full-text available
In this paper, the influence of bentonite (BNT) on rheological properties, linear shrinkage, hardness, and structure of polyethylene wax (PE-wax) used in the lost-wax casting process are studied. Experiments were conducted with PE-wax with different contents of bentonite (from 0.1 to 5 wt.%). The structural changes of modified polyethylene wax were...
Article
Full-text available
This article proposes thermography as a non-contact diagnostic tool for assessing drive reliability. The application of this technique during the operation of the belt transmission with a heat-welded thermoplastic polyurethane V-belt was presented. The V-belt temperature changes depending on the braking torque load at different values of the rotati...
Article
Full-text available
Abstract: The article presents contemporary problems on the plastic packaging market, resulting from changes in the legislation of the European Union, introducing a new approach to the management of polymer materials at every stage of the life cycle. The idea of a Circular Economy (CE) has been described and issues related to packaging materials. P...
Poster
Full-text available
The aim of study was to compare properties of pure and recycled PE blends with different filler content. Talc was compounded with: rLDPE and rLLDPE using a twin-screw extruder. The composites were blown moulded and the effect of the filler content on the end-use properties of blown films were investigated. The effect of talc on crystallization and...
Chapter
Full-text available
The aim of study was to compare properties of pure and recycled polyethylene blends with different filler content. Talc was compounded with two types of recyclable polyethylene: rLDPE and rLLDPE using a twin-screw extruder. The composites were blown moulded and the effect of the filler content on the end-use properties of blown films were investiga...
Conference Paper
Full-text available
The tests were based on biodegradable flexible films for food packaging: aliphatic-aromatic copolyester (AA), aliphatic-aromatic copolyester with chitosan and starch (AA-CH-S), aliphatic-aromatic copolyester with thermoplastic starch (AA-S). The irradiation process of materials was conducted with doses: 0, 5, 10, 20 and 40 kGy. The following tests...
Article
Full-text available
The paper presents the results of the investigation into the themo-mechanical, rheological and structural properties of films made from recycled polyethylenes in the "foil-to-foil" system, the comparative material were films made from primary raw materials. The films were prepared by melt mixing technique in a single screw extruder. Primary polyeth...
Preprint
Based on COMMISSION REGULATION (EC) No 282/2008 of 27 March 2008 on recycled plastic materials and articles intended to come into contact with foods and amending Regulation (EC) No 2023/2006.
Article
Full-text available
The effects of octakis[(3-glycidoxypropyl)dimethylsiloxy]octasilsesquioxane (GPOSS) on the crystallinity, crystal structure, morphology, and mechanical properties of polyoxymethylene (POM) and POM/GPOSS composites were investigated. The POM/GPOSS composites with varying concentrations of GPOSS nanoparticles (0.05-0.25 wt. %) were prepared via melt...
Article
Full-text available
Abstract: Cellular extrusion is a method for manufacturing profiles, bars, low density cellular coatings and other cellular products that have no hollow cavities on the surface and show minimal processing shrinkage, while their properties are similar to those of products produced by conventional extrusion. The paper deals with cellular extrusion of...
Chapter
Full-text available
The subject of the study were selected biodegradable and/or compostable materials with proven market potential available on the European market and in the USA. The following materials were tested: AAC, CEL, PLA, PVAL, BLOG, BPAR, KUK, and PHB. The film samples were exposed to radiation in the air and in vacuum conditions with a dose of 10 kGy and 4...
Article
Full-text available
Abstract: Rheological and calorimetric studies of recycled polyethylene powders obtained by pulverization were performed. on the basis of the studies, the viscosity and flow curves of the recycled powders were determined which were compared to the virgin powder suitable for rotary molding. Viscosity measurements were made using a LCR 7000 Dynisco c...
Poster
Full-text available
Próbki zostały poddane procesowi przyspieszonego starzenia promieniowaniem UV o długości fali 340 nm. Ekspozycję prowadzono przez 30 dni w segmencie dziennym oraz nocnym. Dawka promieniowania UV odpowiadała ekspozycji w ciągu 1 roku w warunkach klimatu umiarkowanego. W wyniku przeprowadzonych badań DSC nie stwierdzono istotnych zmian strukturalnych...
Article
Polyoxymethylene composites with octakis (dimethylsiloxy, ethyl epoxycyclohexy)octasilsesquioxanes and octakis(dimethylsiloxy, vinyl)octasilsesquioxanes contents (0.5 and 1 wt.%) were studied. The effect of silsesquioxanes (POSS) on crystallization and melting behaviour of polyoxymethylene (POM) was investigated by polarized light microscope (PLM),...
Article
Full-text available
In this paper the influence of silsesquioxanes (POSS) on crystallization behaviour of polyoxymethylene (POM) during non-isothermal crystallization was investigated by polarized light microscope (PLM) and differential scanning calorimetry (DSC). The study concerns polyoxymethylene (POM) and nanocomposites containing POSS’s with different organic fun...
Article
Full-text available
This paper presents the results of thermal properties and linear shrinkage of jewelry waxes utilized in investment casting. Three types of jewelry waxes were cyclically processed (by heating, holding in a molten state and cooling) in the temperature range between 25 and 90 °C for about 7 hours. The samples were tested after 5th, 10th and 15th cycle...
Article
Full-text available
Nanoparticles of [3-(2-amlnoethyl)amlno]propyl-hepta-isobutyl-polysilsesquioxane were added (0.5 and 1% by mass) to polyamide 6 (PA 6) and polyoxymethylene (POM) to modify thermal stability of the nanocomposltes. The addn. resulted In an Increase In the decompn. temp of the polymers. The best result was achieved for the POM nanocomposltes. A color...
Article
Full-text available
Tworzywa termoutwardzalne, a zwłaszcza kompozyty wzmocnione włóknem szklanym, określane były przez długi czas jako nienadające się do recyklingu. Powodem tego były nieodwracalne procesy, które zachodzą podczas utwardzania tworzyw utwardzalnych i prowadzą do powstawania trwałych, przestrzennie usieciowanych struktur. Dodatkową wadą jest wysoka zawar...
Article
Full-text available
Wpływ warunków przetwórstwa na właściwości i strukturę regranulatu poli(tereftalanu etylenu)-rPET Wstęp Poli(tereftalan etylenu)-PET jest powszechnie stosowanym poli-merem do produkcji opakowań (butelki i folie) oraz taśm i włókien. Większość światowej produkcji PET obejmuje produkcję włókien syn-tetycznych (ponad 60%), kolejna część to produkcja b...
Article
Full-text available
Nanoparticles of [3-(2-aminoethyl)amino]propyl-heptaisobutyl- polysilsesquioxane were added (0.5 and 1% by mass) to modify mech. and thermal properties as well as morphology of polyamide 6 and polyoxymethylene nanocomposites. The addn. resulted in an improvement of melt flow index, tensile strength, elongation at break, Young modulus (tension) hard...
Article
Full-text available
Polyoxymethylene was reinforced with nano-sized inorg. vinyl group-contg. polyhedral oligomeric silsesquioxanes (winPOSS) 0.5 and 1.0% by mass in molten state by extrusion in a single screw extruder. Mech. properties and structural changes of the nanocomposite materials were detd. by dynamic mech. thermal anal. and scanning electron microscopy, equ...
Article
Full-text available
Zbadano wpływ dodatku różnego rodzaju i ilości POSS do trzech typów polimerów (PE-LD, iPP oraz POM), na krystalizację oraz właściwości reologiczne wytworzonych kompozytów. Zaobserwowano stosunkowo niewielki efekt zarodkowania heterogenicznego związków POSS, skutkujący wzrostem temperatury krystalizacji polimerowej osnowy. Zmiany lepkości wywołane p...
Article
Full-text available
Polyoxymethylene nanocomposites with octakis (dimethylsiloxy, ethyl epoxycyclohexy) octasilsesquioxanes (POSS) were ob-tained during melt blending. The influence of the POSS nanoparticles on the morphology and mechanical properties of polyoxymethylene (POM) nanocomposites properties was investigated. POM/POSS nanocomposites were produced by means o...
Chapter
Full-text available
Ionizing radiation interacting with animated or inanimate matter may cause multidirectional changes. The combination of ionization methods of food preservation with biodegradable packaging brings many benefits to the environment and consumers. From many biodegradable polymers the starch is the most common. Native starch is used as a filler but such...
Article
Polyoxymethylene nanocomposites with octakis (dimethylsiloxy, ethyl epoxycyclohexy) octasilsesquioxanes (POSS) were obtained during melt blending. The influence of the POSS nanoparticles on the morphology and mechanical properties of polyoxymethylene (POM) nanocomposites properties was investigated. POM/POSS nanocomposites were produced by means of...
Article
Full-text available
Kompozyty na bazie odpadów poliolefi n napełnianych popiołami lotnymi Wstęp Rozwój gospodarki przemysłowej i wzrost liczby ludności są czynni-kami sprzyjającymi powstawaniu różnego rodzaju odpadów produkcyj-nych i poużytkowych. Głównymi składnikami odpadów polimerowych gromadzonych na wysypiskach komunalnych (około 70%) są poliety-leny i polipropyl...
Article
Full-text available
W artykule przedstawiono wyniki badań wpływu zawartości montmorylonitu (MMT) na wybrane właściwości mechaniczne recyklatów gumowych. Analiza została oparta na wynikach badań uzyskanych w próbie statycznego rozciągania, rozdzierania, pomiaru twardości i elastyczności gumy. Badania wykazały, że dodatek niewielkiej ilości MMT spowodował polepszenie wł...
Article
Full-text available
The paper presents the influence of reprocessing on brittle-ductile transition (BDT) of the amorphous and semicrystalline polymers. We studied a virgin and recycled material: poly(ethylene terephthalate) and polycarbonate after 4-cycles and 6-cycles of processing. In this study, we compared the mechanical properties and structural, rheological prop...

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Projects

Projects (5)
Project
Development of the concept of polymer waste utilization technology from the automotive industry through separation processes and gasification. Project director: dr hab. eng. Dorota Czarnecka-Komorowska