TY - JOUR AU - Hornyák-Mester, Enikő AU - Pecsmány , Dániel János AU - Varga, Miklós AU - Ibrahim, Al-omari AU - Román, Krisztina AU - Viskolcz, Béla TI - A Miskolci Egyetem FIEK Projekt keretein belül létesített Poliuretán Kísérleti Üzem és Laboratóriumok JF - MŰANYAG- ÉS GUMIIPARI ÉVKÖNYV J2 - MŰANYAG- ÉS GUMIIPARI ÉVKÖNYV VL - 19 PY - 2021 SP - 46 EP - 50 PG - 5 SN - 1589-6269 UR - https://m2.mtmt.hu/api/publication/32011188 ID - 32011188 LA - Hungarian DB - MTMT ER - TY - THES AU - Román, Krisztina TI - Növényi adalékanyagokkal töltött habosított PVC kompozitok PY - 2021 SP - 129 DO - 10.14750/ME.2021.006 UR - https://m2.mtmt.hu/api/publication/31876468 ID - 31876468 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Román, Krisztina AU - Szabó, Tamás AU - Marossy, Kálmán TI - Determination of Natural Filler Orientation in Foamed PVC Composites by Ultrasound Measurements JF - POLYMER-KOREA J2 - POLYM-KOREA VL - 45 PY - 2021 IS - 1 SP - 31 EP - 38 PG - 8 SN - 0379-153X DO - 10.7317/pk.2021.45.1.31 UR - https://m2.mtmt.hu/api/publication/31648155 ID - 31648155 LA - English DB - MTMT ER - TY - JOUR AU - Román, Krisztina AU - Szabó, Tamás AU - Marossy, Kálmán TI - Rheological characterization of PVC corncob composites. Effect of molecule weight of PVC JF - JOURNAL OF PHYSICS-CONFERENCE SERIES J2 - J PHYS CONF SER VL - 1527 PY - 2020 PG - 7 SN - 1742-6588 DO - 10.1088/1742-6596/1527/1/012024 UR - https://m2.mtmt.hu/api/publication/31338536 ID - 31338536 N1 - WoS:hiba:000593872300024 2024-02-20 18:36 típus nem egyezik LA - English DB - MTMT ER - TY - JOUR AU - Vanyorek, László AU - Sikora, Emőke AU - Balogh, Tamás AU - Román, Krisztina AU - Marossy, Kálmán AU - Pekker, Péter AU - Szabó, Tamás AU - Viskolcz, Béla AU - Fiser, Béla TI - Nanotubes as polymer composite reinforcing additive materials – A comparative study JF - ARABIAN JOURNAL OF CHEMISTRY J2 - ARAB J CHEM VL - 13 PY - 2020 IS - 2 SP - 3775 EP - 3782 PG - 8 SN - 1878-5352 DO - 10.1016/j.arabjc.2019.01.001 UR - https://m2.mtmt.hu/api/publication/30814407 ID - 30814407 N1 - Institute of Chemistry, University of Miskolc, Miskolc-Egyetemváros, 3515, Hungary Institute of Ceramics and Polymer Engineering, University of Miskolc, Miskolc-Egyetemváros, 3515, Hungary Wanhua BorsodChem Ltd., Vinyl Technology, 3700 Kazincbarcika, Bolyai tér 1, Hungary Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, 8200 Veszprém, Egyetem Str. 10, Hungary Ferenc Rákóczi II. Transcarpathian Hungarian Institute, Beregszász, Transcarpathia 90200, Ukraine Cited By :11 Export Date: 18 November 2022 Correspondence Address: Fiser, B.; Institute of Chemistry, Hungary; email: fiser@uni-miskolc.hu LA - English DB - MTMT ER - TY - GEN AU - Román, Krisztina AU - Szabó, Tamás AU - Marossy, Kálmán TI - Rheological Characterization of PVC Corncob Composites. Effect of Molecula Weight of PVC. Konferenciaelőadás TS - Konferenciaelőadás PY - 2019 UR - https://m2.mtmt.hu/api/publication/31334734 ID - 31334734 N1 - Poszter LA - English DB - MTMT ER - TY - CHAP AU - Román, Krisztina AU - Udvardi, Bella AU - Kurovics, Emese AU - Szabó, Tamás AU - Marossy, Kálmán ED - Hernández, S ED - Northwood, DO ED - De Hosson, J ED - Vilar, R TI - DETERMINING FRACTURE TOUGHNESS OF WOOD FLOUR/HEMP-REINFORCED PVC POLYMER COMPOSITES T2 - Materials and Contact Characterisation IX PB - WIT Press CY - Southampton SN - 9781784663315 PY - 2019 SP - 109 EP - 115 PG - 7 DO - 10.2495/MC190111 UR - https://m2.mtmt.hu/api/publication/30932740 ID - 30932740 AB - Rigid PVC wood flour composites were prepared with various volume fractions of wood flour to investigate the effect of the structure properties on the fractural and tensile behavior. During the mixture preparation the first question is the compatibility of the wood flour additive with the rigid PVC and the safe concentration range of the additive. The second question is the fractural behavior of the composites. Accordingly, the 300–400 micrometer particle size beech wood content was varied using 15, 20, 25 parts per weight of the polymer matrix. Since both the PVC and the major components of the beech wood (cellulose and lignin) are polar, we did not use a coupling agent between the polymer and the natural filler. Thus, the properties of the composites as function of concentration can be examined. The usual mechanical properties, such as tensile strength, elongation at break and so-called compact tensile fracture mechanical analysis was also performed. It has been found that the composites could be safely processed with up to 25 parts by weight wood content. However, the properties of 25 parts by weight filler content sample already showed a decrease in strength properties. We also tried to improve the fracture mechanical properties with fibrous (1 cm long) natural filler. In this case 20 parts by weight of wood flour content with one, three and five parts by weight hemp fiber were used in the PVC polymer matrix. The tests results showed that these fibrous fillers neither decrease nor improve the mechanical properties. The raw measurement results were evaluated according to the critical stress intensity factor (Kc) and the critical crack propagation energy (Gc). Ultrasound propagation measurements are in progress trying to determine the effect of structural changes and interactions at increased hemp fiber content. LA - English DB - MTMT ER - TY - CHAP AU - Kurovics, Emese AU - Udvardi, Bella AU - Román, Krisztina AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - Gömze, Antal László ED - S., Hernández ED - J., De Hosson ED - D.O., Northwood ED - R., Vilar TI - EXAMINATION OF THE CARBONIZATION PROCESS USING KAOLIN AND SAWDUST T2 - Materials and Contact Characterisation IX PB - WIT Press CY - Southampton SN - 9781784663322 T3 - WIT Transactions on Engineering Sciences, ISSN 1746-4471 ; 124. PY - 2019 SP - 17 EP - 24 PG - 8 DO - 10.2495/MC190021 UR - https://m2.mtmt.hu/api/publication/30800180 ID - 30800180 AB - Ceramics reinforced with carbon and silicon carbide particles are of great importance in the field of technical ceramics and ceramic composites. In this research, the possibilities of producing advanced ceramics from traditional, relatively inexpensive materials were studied. The authors have successfully developed mullite ceramic materials reinforced with carbon particles using kaolinite powder and sawdust. Powder mixtures with different compositions were prepared in a planetary ball mill using silica balls. The produced mixtures were compacted in a 100 kN pull-press to produce pellets using a pressure of 140 MPa. The prepared specimens were sintered in a laboratory chamber kiln under oxygen deficient conditions at 1250°C. After sintering of the specimens, considerable amounts of carbon content were incorporated into the material structure of produced ceramics, which were confirmed by energy-dispersive X-ray analysis. Using 10–20 m% sawdust in the mixtures, the carbon (C) content of sintered specimens was found to be more than 8 m%. Keywords: carbon, carbonization, ceramics, kaolinite, mullite, sawdust. LA - English DB - MTMT ER - TY - JOUR AU - Udvardi, Bella AU - Román, Krisztina AU - Kurovics, Emese AU - Géber, Róbert AU - Kocserha, István TI - PREPARATION AND INVESTIGATION OF GEOPOLYMERS GENERATED FROM CONSTRUCTION, DEMOLITION AND INDUSTRIAL WASTES JF - WIT Transactions on Engineering Sciences-Materials and Contact Characterisation IX. VL - 124 PY - 2019 SP - 49 EP - 59 PG - 15 SN - 1743-3533 DO - 10.2495/MC190051 UR - https://m2.mtmt.hu/api/publication/30754738 ID - 30754738 AB - Geopolymers are inorganic amorphous aluminosilicate materials, which can be produced by the alkali activation of materials with high aluminum and silicon content. In this research, we prepared geopolymer samples obtained from construction and demolition (C&D) waste materials (brick powder and concrete powder), as well as industrial waste material (aluminum dross), and we investigated them using different test methods. Density, particle size distribution and chemical elemental composition were determined on the dried powdered waste materials, and microstructural observations were also made using a scanning electron microscope (SEM) technique. To prepare the geopolymer sample mixtures of sodium-hydroxide and sodium silicate, we used an alkali activator solution at different concentrations (4 M, 8 M and 12 M). We used Fourier Transformation Infrared Spectroscopy (FTIR) to reveal new phases in geopolymer samples. Compression strength was determined after 7 days and after 28 days. In the cases when aluminum dross was used, a gas-forming reaction took place in the geopolymer pastes; therefore, foamed geopolymer was produced. According to these results, the used C&D and industrial wastes may be potential raw materials which could be used to prepare geopolymers. Keywords: carbon dioxide, geopolymers, foamed geopolymer, construction waste, demolition waste, aluminum dross, compression strength, material microscopy. LA - English DB - MTMT ER - TY - JOUR AU - Román, Krisztina AU - Zsoldos, Gabriella TI - PVC/LDPE Blends: Relationship between thermal/mechanical properties, structure and blend behaviour JF - INTERNATIONAL JOURNAL OF ENGINEERING AND MANAGEMENT SCIENCES / MŰSZAKI ÉS MENEDZSMENT TUDOMÁNYI KÖZLEMÉNYEK J2 - IJEMS MMTK VL - 4 PY - 2019 SP - 162 EP - 165 PG - 4 SN - 2498-700X UR - https://m2.mtmt.hu/api/publication/30699357 ID - 30699357 N1 - "A cikkben/előadásban/tanulmányban ismertetett kutató munka az EFOP-3.6.1-16-2016-00011 jelű „Fiatalodó és Megújuló Egyetem – Innovatív Tudásváros – a Miskolci Egyetem intelligens szakosodást szolgáló intézményi fejlesztése” projekt részeként – a Széchenyi 2020 keretében – az Európai Unió támogatásával, az Európai Szociális Alap társfinanszírozásával valósul meg" = “The described article/presentation/study was carried out as part of the EFOP-3.6.1-16-00011 “Younger and Renewing University – Innovative Knowledge City – institutional development of the University of Miskolc aiming at intelligent specialisation” project implemented in the framework of the Szechenyi 2020 program. The realization of this project is supported by the European Union, co-financed by the European Social Fund.” LA - English DB - MTMT ER -