@article{MTMT:34676085, title = {Factors and processes determining the impact resistance of PP impact copolymers with multi-phase structure}, url = {https://m2.mtmt.hu/api/publication/34676085}, author = {Ferdinánd, Milán László and Jerabek, M. and Várdai, Róbert and Pregi, Emese and Lummerstorfer, T. and Gahleitner, M. and Faludi, Gábor and Móczó, János and Pukánszky, Béla}, doi = {10.3144/expresspolymlett.2024.30}, journal-iso = {EXPRESS POLYM LETT}, journal = {EXPRESS POLYMER LETTERS}, volume = {18}, unique-id = {34676085}, issn = {1788-618X}, abstract = {The impact resistance of four polypropylene impact copolymers (ICPs) with multi-phase structures and widely differing characteristics was related to their structure. Blends were prepared from one of them and a high-density polyethylene (HDPE) to improve impact strength further. The structure of the materials was characterized by microscopy and dynamic mechanical thermal analysis. Mechanical properties were determined by tensile and impact testing, while local deformation processes were followed by volume strain measurements. The results obtained in the study proved that the shear-yielding of the matrix contributes the most among local processes to the increase of impact strength, while cavitation has a small effect on this latter property since its energy absorption is negligible. Both increasing elastomer content and decreasing particle size favor shear-yielding, thus improving impact strength. Considering the importance of elastomer content and elastomer particle size, a simple but very good model was created describing the dependence of the impact strength of ICPs on these latter two factors by using linear regression analysis. Although the addition of HDPE increases the fracture resistance of ICPs further, the extent of improvement is moderate, and the approach is economically disadvantageous. © BME-PT.}, keywords = {COPOLYMERS; Regression Analysis; STRAIN; impact strength; particle size; ELASTOMER; injection molding; injection molding; Particle size analysis; Thermoanalysis; shear flow; Tensile testing; Elastomers; Polypropylenes; Deformation process; Particles sizes; Impact testing; High density polyethylenes; Local deformations; Impact behaviour; shear yielding; Impact behavior; Failure modeling; Failure modelling; High-density polyethylenes; Multi-phase structures; local deformation processes; Impact copolymers; Local deformation process}, year = {2024}, eissn = {1788-618X}, pages = {406-419} } @article{MTMT:33999330, title = {Levocetirizine-Loaded Electrospun Fibers from Water-Soluble Polymers: Encapsulation and Drug Release}, url = {https://m2.mtmt.hu/api/publication/33999330}, author = {Yi, Lan and Cui, Lu and Cheng, Linrui and Móczó, János and Pukánszky, Béla}, doi = {10.3390/molecules28104188}, journal-iso = {MOLECULES}, journal = {MOLECULES}, volume = {28}, unique-id = {33999330}, issn = {1420-3049}, abstract = {Electrospun fibers containing levocetirizine, a BCS III drug, were prepared from three water-soluble polymers, hydroxypropyl methylcellulose (HPMC), polyvinylpyrrolidone (PVP) and polyvinyl alcohol (PVA). Fiber-spinning technology was optimized for each polymer separately. The polymers contained 10 wt% of the active component. An amorphous drug was homogeneously distributed within the fibers. The solubility of the drug in the polymers used was limited, with a maximum of 2.0 wt%, but it was very large in most of the solvents used for fiber spinning and in the dissolution media. The thickness of the fibers was uniform and the presence of the drug basically did not influence it at all. The fiber diameters were in the same range, although somewhat thinner fibers could be prepared from PVA than from the other two polymers. The results showed that the drug was amorphous in the fibers. Most of the drug was located within the fibers, probably as a separate phase; the encapsulation efficiency proved to be 80–90%. The kinetics of the drug release were evaluated quantitatively by the Noyes–Whitney model. The released drug was approximately the same for all the polymers under all conditions (pH), and it changed somewhere between 80 and 100%. The release rate depended both on the type of polymer and pH and varied between 0.1 and 0.9 min−1. Consequently, the selection of the carrier polymer allowed for the adjustment of the release rate according to the requirements, thus justifying the use of electrospun fibers as carrier materials for levocetirizine.}, year = {2023}, eissn = {1420-3049}, orcid-numbers = {Yi, Lan/0000-0002-0551-3804} } @article{MTMT:33989559, title = {Comparison of the effect and efficiency of two impact modification approaches in polypropylene}, url = {https://m2.mtmt.hu/api/publication/33989559}, author = {Ferdinánd, Milán László and Várdai, Róbert and Lummerstorfer, Thomas and Pretschuh, Claudia and Gahleitner, Markus and Móczó, János and Pukánszky, Béla}, doi = {10.3144/expresspolymlett.2023.62}, journal-iso = {EXPRESS POLYM LETT}, journal = {EXPRESS POLYMER LETTERS}, volume = {17}, unique-id = {33989559}, issn = {1788-618X}, year = {2023}, eissn = {1788-618X}, pages = {837-849} } @article{MTMT:33870487, title = {Impact modification of wood flour reinforced PP composites: Problems, analysis, solution}, url = {https://m2.mtmt.hu/api/publication/33870487}, author = {Ferdinánd, Milán László and Jerabek, Michael and Várdai, Róbert and Lummerstorfer, Thomas and Pretschuh, Claudia and Gahleitner, Markus and Faludi, Gábor and Móczó, János and Pukánszky, Béla}, doi = {10.1016/j.compositesa.2023.107445}, journal-iso = {COMPOS PART A-APPL S}, journal = {COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING}, volume = {167}, unique-id = {33870487}, issn = {1359-835X}, year = {2023}, eissn = {1878-5840}, orcid-numbers = {Várdai, Róbert/0000-0002-9031-6724} } @article{MTMT:33698773, title = {Impact modification of PP with short PET fibers: Effect of heat setting on fiber characteristics and composite properties}, url = {https://m2.mtmt.hu/api/publication/33698773}, author = {Ferdinánd, Milán László and Várdai, Róbert and Lummerstorfer, Thomas and Pretschuh, Claudia and Gahleitner, Markus and Faludi, Gábor and Móczó, János and Pukánszky, Béla}, doi = {10.1016/j.compstruct.2023.116810}, journal-iso = {COMPOS STRUCT}, journal = {COMPOSITE STRUCTURES}, volume = {311}, unique-id = {33698773}, issn = {0263-8223}, year = {2023}, eissn = {1879-1085} } @article{MTMT:33330192, title = {A novel approach to the impact modification of PLA}, url = {https://m2.mtmt.hu/api/publication/33330192}, author = {Ferdinánd, Milán László and Várdai, Róbert and Móczó, János and Pukánszky, Béla}, doi = {10.1016/j.engfracmech.2022.108950}, journal-iso = {ENG FRACT MECH}, journal = {ENGINEERING FRACTURE MECHANICS}, volume = {277}, unique-id = {33330192}, issn = {0013-7944}, year = {2023}, eissn = {1873-7315} } @article{MTMT:33282145, title = {Poly(lactic acid) reinforced with synthetic polymer fibers: interactions, structure and properties}, url = {https://m2.mtmt.hu/api/publication/33282145}, author = {Ferdinánd, Milán László and Várdai, Róbert and Móczó, János and Pukánszky, Béla}, doi = {10.1016/j.compositesa.2022.107318}, journal-iso = {COMPOS PART A-APPL S}, journal = {COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING}, volume = {164}, unique-id = {33282145}, issn = {1359-835X}, year = {2023}, eissn = {1878-5840} } @article{MTMT:33212862, title = {Reinforcement of PP with a hybrid nanofiller; comparison to talc}, url = {https://m2.mtmt.hu/api/publication/33212862}, author = {Ferdinánd, Milán László and Várdai, Róbert and Móczó, János and Pukánszky, Béla}, doi = {10.1016/j.polymertesting.2022.107840}, journal-iso = {POLYM TEST}, journal = {POLYMER TESTING}, volume = {117}, unique-id = {33212862}, issn = {0142-9418}, year = {2023}, eissn = {1873-2348} } @article{MTMT:33272193, title = {Preparation and characterization of fibrous alumina and zirconia toughened alumina ceramics with gradient porosity}, url = {https://m2.mtmt.hu/api/publication/33272193}, author = {Bódis, Eszter and Molnár, Kolos and Móczó, János and Károly, Zoltán}, doi = {10.3390/nano12234165}, journal-iso = {NANOMATERIALS-BASEL}, journal = {NANOMATERIALS}, volume = {12}, unique-id = {33272193}, abstract = {This paper investigated a synthesis process for highly porous Al2O3, Y-ZTA, and Ce-ZTA ceramic nanocomposites with gradient microstructure and improved mechanical properties. Ceramic nanofibres were synthesized as the starting material. The gradient microstructure was developed during spark plasma sintering using an asymmetric graphite arrangement that generated significant temperature differences (80–100 °C) between the opposite sides of the samples. Structural and mechanical properties of the fibrous ceramic composites were investigated. The effect of the temperature gradient on properties was also discussed. While the asymmetric configuration resulted in a gradient porosity, reference samples fabricated in standard graphite configuration were uniformly porous. The gradient structure and the ZrO2 addition led to improved hardness and compression strength of the sintered samples. However, the opposite sides of the samples exhibited considerable variations in both microstructure and in terms of properties. The upper part of the Ce-ZTA ceramic showed a highly porous structure with 18.2 GPa hardness, while the opposite side was highly densified with 23.0 GPa hardness. Compressive strength was 46.1 MPa and 52.1 MPa for Y-ZTA and Ce-ZTA sintered at 1300 °C, respectively, despite their high porosity. The research provided a promising approach to prepare highly porous ZTA composites with high strength for a wide range of applications.}, year = {2022}, eissn = {2079-4991}, orcid-numbers = {Molnár, Kolos/0000-0002-9331-4652} } @article{MTMT:33189814, title = {Preparation of Biocomposites with Natural Reinforcements: The Effect of Native Starch and Sugarcane Bagasse Fibers}, url = {https://m2.mtmt.hu/api/publication/33189814}, author = {Józó, Muriel and Várdai, Róbert and Bartos, András and Móczó, János and Pukánszky, Béla}, doi = {10.3390/molecules27196423}, journal-iso = {MOLECULES}, journal = {MOLECULES}, volume = {27}, unique-id = {33189814}, issn = {1420-3049}, abstract = {Biocomposites were prepared from poly(lactic acid) and two natural reinforcements, a native starch and sugarcane bagasse fibers. The strength of interfacial adhesion was estimated by model calculations, and local deformation processes were followed by acoustic emission testing. The results showed that the two additives influence properties differently. The strength of interfacial adhesion and thus the extent of reinforcement are similar because of similarities in chemical structure, the large number of OH groups in both reinforcements. Relatively strong interfacial adhesion develops between the components, which renders coupling inefficient. Dissimilar particle characteristics influence local deformation processes considerably. The smaller particle size of starch results in larger debonding stress and thus larger composite strength. The fracture of the bagasse fibers leads to larger energy consumption and to increased impact resistance. Although the environmental benefit of the prepared biocomposites is similar, the overall performance of the bagasse fiber reinforced PLA composites is better than that offered by the PLA/starch composites.}, year = {2022}, eissn = {1420-3049} }