TY - JOUR AU - Lendvai, László AU - Singh, Tej AU - Ronkay, Ferenc György TI - Thermal, thermomechanical and structural properties of recycled polyethylene terephthalate (rPET)/waste marble dust composites JF - HELIYON J2 - HELIYON VL - 10 PY - 2024 IS - 3 PG - 13 SN - 2405-8440 DO - 10.1016/j.heliyon.2024.e25015 UR - https://m2.mtmt.hu/api/publication/34523954 ID - 34523954 LA - English DB - MTMT ER - TY - JOUR AU - Singh, Tej AU - Fekete, Imre AU - Jakab, Sándor Kálmán AU - Lendvai, László TI - Selection of straw waste reinforced sustainable polymer composite using a multi-criteria decision-making approach JF - BIOMASS CONVERSION AND BIOREFINERY J2 - BIOMASS CONV BIOREFINERY VL - Előzetes kiadás / Early view PY - 2024 PG - 11 SN - 2190-6815 DO - 10.1007/s13399-023-04132-w UR - https://m2.mtmt.hu/api/publication/33748423 ID - 33748423 AB - The valorization of straw waste as a sustainable and eco-friendly resource in polymer composites is critical for resource recycling and environmental preservation. Therefore, many research works are being carried out regarding the development of wheat straw-based polymer composites to identify the reinforcing potential of these sustainable resources. In this study, three different sizes of wheat straw fibers (60–120 mesh, 35–60 mesh, and 18–35 mesh) were used, and their different ratios (0, 2.5, 5, 10, and 20% by weight) were systematically investigated for the physical and mechanical properties of polypropylene-based sustainable composites. The results indicated that the evaluated composites’ properties are strongly dependent on the quantity and size of the utilized wheat straw. Therefore, a preference selection index was applied to rank the developed sustainable polymer composites to select the best composition. Various properties of the composite materials were considered as criteria for ranking the alternatives, namely tensile strength and modulus, flexural stress at conventional deflection and flexural modulus, impact strength, density, water absorption, material cost, and carbon footprint. The decision-making analysis suggests the alternative with wheat straw content of 20 wt.% (35–60 mesh size) dominating the performance by maximizing the beneficial criteria and minimizing the non-beneficial criteria, making it the most suitable alternative. This study will significantly help formulation designers to deal with the amount and size issues when developing polymeric composites. LA - English DB - MTMT ER - TY - JOUR AU - Lendvai, László AU - Singh, Tej AU - Rigotti, Daniele AU - Pegoretti, Alessandro TI - Thermally conductive and electrically resistive acrylonitrile butadiene styrene (ABS)/boron nitride composites: Optimal design using a multi-criteria decision-making approach JF - JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY J2 - J MATER RES TECHN VL - 26 PY - 2023 SP - 8776 EP - 8788 PG - 13 SN - 2238-7854 DO - 10.1016/j.jmrt.2023.09.165 UR - https://m2.mtmt.hu/api/publication/34150897 ID - 34150897 LA - English DB - MTMT ER - TY - JOUR AU - Lendvai, László AU - Rigotti, Daniele TI - Thermal and thermomechanical properties of boron nitride-filled acrylonitrile butadiene styrene (ABS) composites JF - ACTA TECHNICA JAURINENSIS J2 - ACTA TECH JAURIN VL - 16 PY - 2023 IS - 3 SP - 123 EP - 128 PG - 6 SN - 1789-6932 DO - 10.14513/actatechjaur.00706 UR - https://m2.mtmt.hu/api/publication/34074450 ID - 34074450 AB - The present study aims at investigating the effect of hexagonal boron nitride (hBN) nanoplatelets on the properties of acrylonitrile butadiene styrene (ABS) polymer. Composites containing 0-30 vol% hBN were prepared through batchwise melt compounding, which was followed by compression molding. Subsequently, the thermal and thermomechanical properties of the fabricated samples were investigated. The dynamic mechanical analysis (DMA) revealed that the storage modulus of the samples was markedly improved in the entire examined temperature range, while the glass transition temperature also gradually increased as a function of hBN content. According to the thermogravimetric analysis (TGA), the incorporated boron nitride particles enhanced the thermal stability of ABS composites, exhibiting a notably higher decomposition onset temperature. Additionally, the thermal conductivity of the ABS/hBN composites significantly increased by 570% when the hBN content was 30 vol%. LA - English DB - MTMT ER - TY - JOUR AU - Lendvai, László TI - Lignocellulosic agro-residue/polylactic acid (PLA) biocomposites: Rapeseed straw as a sustainable filler JF - CLEANER MATERIALS J2 - CLEANER MATERIALS VL - 9 PY - 2023 PG - 11 SN - 2772-3976 DO - 10.1016/j.clema.2023.100196 UR - https://m2.mtmt.hu/api/publication/34048360 ID - 34048360 LA - English DB - MTMT ER - TY - JOUR AU - Drakopoulos, Stavros X. AU - Špitalský, Zdenko AU - Peidayesh, Hamed AU - Lendvai, László TI - The Effect of Drying of Glycerol-Plasticized Starch upon Its Dielectric Relaxation Dynamics and Charge Transport JF - JOURNAL OF POLYMERS AND THE ENVIRONMENT J2 - J POLYM ENVIRON VL - 31 PY - 2023 SP - 5389 EP - 5400 PG - 12 SN - 1566-2543 DO - 10.1007/s10924-023-02962-3 UR - https://m2.mtmt.hu/api/publication/34041253 ID - 34041253 LA - English DB - MTMT ER - TY - JOUR AU - Lendvai, László TI - Mechanical and morphological properties of PP/XNBR blends produced with rubber latex JF - JOURNAL OF POLYMER RESEARCH J2 - J POLYM RES VL - 30 PY - 2023 IS - 7 PG - 10 SN - 1022-9760 DO - 10.1007/s10965-023-03660-3 UR - https://m2.mtmt.hu/api/publication/34033644 ID - 34033644 N1 - Department of Materials Science and Engineering, Széchenyi István University, Egyetem tér 1, Győr, H-9026, Hungary Department of Polymer Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, H-1111, Hungary Export Date: 6 July 2023 CODEN: JPORE Correspondence Address: Lendvai, L.; Department of Materials Science and Engineering, Egyetem tér 1, Hungary; email: lendvai.laszlo@sze.hu AB - In this work, polypropylene (PP)/carboxylated acrylonitrile butadiene rubber (XNBR) binary blends were prepared with the elastomer component dosed in its suspension (latex) form into the polymer matrix during melt compounding. For this purpose, samples containing 0-20 wt.% rubber were prepared using two different PP grades as matrices with lower and higher viscosity. Analogous reference samples with the same composition were also fabricated using traditional melt mixing by introducing the rubber in its dry, bulk form in order to analyze the efficiency of the latex route. Mechanical, thermomechanical and morphological analyses were used to investigate the structure-property relationships of the blends. Based on the SEM images the average domain size of the dispersed XNBR domains became markedly smaller when the rubber was introduced in its suspension form into the PP. Based on the Charpy impact tests and the tensile test results, the decreased rubber domain size led to improved ductility and toughness. The improvement was more prominent when the difference between the viscosity of the PP matrix and the XNBR rubber was higher. LA - English DB - MTMT ER - TY - JOUR AU - Singh, Tej AU - Aherwar, Amit AU - Ranakoti, Lalit AU - Bhandari, Prabhakar AU - Singh, Vedant AU - Lendvai, László TI - Performance Optimization of Lignocellulosic Fiber-Reinforced Brake Friction Composite Materials Using an Integrated CRITIC-CODAS-Based Decision-Making Approach JF - SUSTAINABILITY J2 - SUSTAINABILITY-BASEL VL - 15 PY - 2023 IS - 11 PG - 18 SN - 2071-1050 DO - 10.3390/su15118880 UR - https://m2.mtmt.hu/api/publication/33939422 ID - 33939422 AB - A hybrid multicriteria decision-making (MCDM) framework, namely “criteria importance through inter-criteria correlation-combinative distance-based assessment” (CRITIC-CODAS) is introduced to rank automotive brake friction composite materials based on their physical and tribological properties. The ranking analysis was performed on ten brake friction composite material alternatives that contained varying proportions (5% and 10% by weight) of hemp, ramie, pineapple, banana, and Kevlar fibers. The properties of alternatives such as density, porosity, compressibility, friction coefficient, fade-recovery performance, friction fluctuation, cost, and carbon footprint were used as selection criteria. An increase in natural fiber content resulted in a decrease in density, along with an increase in porosity and compressibility. The composite with 5 wt.% Kevlar fiber showed the highest coefficient of friction, while the 5 wt.% ramie fiber-based composites exhibited the lowest levels of fade and friction fluctuations. The wear performance was highest in the composite containing 10 wt.% Kevlar fiber, while the composite with 10 wt.% ramie fiber exhibited the highest recovery. The results indicate that including different fibers in varying amounts can affect the evaluated performance criteria. A hybrid CRITIC-CODAS decision-making technique was used to select the optimal brake friction composite. The findings of this approach revealed that adding 10 wt.% banana fiber to the brake friction composite can give the optimal combination of evaluated properties. A sensitivity analysis was performed on several weight exchange scenarios to see the stability of the ranking results. Using Spearman’s correlation with the ranking outcomes from other MCDM techniques, the suggested decision-making framework was further verified, demonstrating its effectiveness and stability. LA - English DB - MTMT ER - TY - JOUR AU - Singh, Tej AU - Pattnaik, Punyasloka AU - Shekhawat, Deepika AU - Ranakoti, Lalit AU - Lendvai, László TI - Waste marble dust-filled sustainable polymer composite selection using a multi-criteria decision-making technique JF - ARABIAN JOURNAL OF CHEMISTRY J2 - ARAB J CHEM VL - 16 PY - 2023 IS - 6 PG - 13 SN - 1878-5352 DO - 10.1016/j.arabjc.2023.104695 UR - https://m2.mtmt.hu/api/publication/33658637 ID - 33658637 LA - English DB - MTMT ER - TY - JOUR AU - Lendvai, László AU - Omastova, Maria AU - Patnaik, Amar AU - Dogossy, Gábor AU - Singh, Tej TI - Valorization of Waste Wood Flour and Rice Husk in Poly(Lactic Acid)-Based Hybrid Biocomposites JF - JOURNAL OF POLYMERS AND THE ENVIRONMENT J2 - J POLYM ENVIRON VL - 31 PY - 2023 SP - 541 EP - 551 PG - 11 SN - 1566-2543 DO - 10.1007/s10924-022-02633-9 UR - https://m2.mtmt.hu/api/publication/33204048 ID - 33204048 AB - This study explores the possibility of developing a new class of hybrid particulate-filled biocomposites using wood flour and rice husk wastes as environmentally friendly additives to poly(lactic acid) (PLA) as matrix material. Samples were prepared with fillers of different concentrations (0, 2.5, 5, 7.5 and 10 wt %), while the ratio of wood flour and rice husk was fixed at 1:1 in all cases. The preparation of biocomposites was performed through extrusion using a twin-screw extruder. Subsequently, they were formed into specimens by injection molding. Mechanical, thermal, thermomechanical, and morphological properties were examined. The addition of natural waste particles resulted in a remarkable improvement both in tensile and flexural modulus; however at a cost of impact strength and tensile strength. Meanwhile, flexural stress at conventional strain values were barely affected by the presence of wood flour and rice husk. The SEM images confirmed that there is a limited interfacial adhesion between the components, which supports the results obtained during mechanical tests. Both the differential scanning calorimetry (DSC) and the dynamic mechanical analysis indicated that the glass transition temperature of PLA was not affected by the incorporation of filler particles; however, the crystalline structure was gradually altered with increasing filler loading according to the DSC. Additionally, the particles were observed acting as nucleating agents, thereby increasing the overall crystallinity of PLA. LA - English DB - MTMT ER -