TY - CONF AU - Vadkerti, Bence AU - Lakatos, Csilla AU - Üneri, Haymana Serra AU - Rágyanszki, Anita AU - Farkas, Ödön AU - Juhász, Anett AU - Zsuga, Miklós AU - Kéki, Sándor AU - Nagy, Lajos ED - Majdik, Cornelia TI - Alifás diizocianátok és butan-1-ol reakcióinak kinetikai vizsgálata =$bKinetic study of the reactions between aliphatic diisocyanates and butan-1-ol T2 - XXIX. Nemzetközi Vegyészkonferencia / 29th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2023 SP - 61 UR - https://m2.mtmt.hu/api/publication/34274180 ID - 34274180 LA - English DB - MTMT ER - TY - JOUR AU - Juhász, Anett AU - Serra, Üneri Haymana AU - Lakatos, Csilla AU - Vadkerti, Bence AU - Rágyanszki, Anita AU - Farkas, Ödön AU - Kéki, Sándor AU - Nagy, Lajos TI - The kinetics of uncatalyzed and catalyzed urethane forming reactions of aliphatic diisocyanates with butan-1-ol JF - NEW JOURNAL OF CHEMISTRY J2 - NEW J CHEM VL - 47 PY - 2023 IS - 34 SP - 16096 EP - 16107 PG - 12 SN - 1144-0546 DO - 10.1039/D3NJ02747C UR - https://m2.mtmt.hu/api/publication/34104794 ID - 34104794 AB - The kinetics of the urethane forming reactions of hexamethylene diisocyanate (HDI), 4,4′-dicyclohexyl-methane-diisocyanate (HMDI) and isophorone diisocyanate (IPDI) with butan-1-ol were studied by electrospray ionization mass spectrometry (ESI-MS). LA - English DB - MTMT ER - TY - JOUR AU - Czifrák, Katalin AU - Lakatos, Csilla AU - Szabó, Gabriella AU - Vadkerti, Bence AU - Daróczi, Lajos AU - Zsuga, Miklós AU - Kéki, Sándor TI - Bisphenol A Diglycidyl Ether-Primary Amine Cooligomer-poly(ε-caprolactone) Networks: Synthesis and Characterization JF - POLYMERS J2 - POLYMERS-BASEL VL - 15 PY - 2023 IS - 13 SP - 1 EP - 15 PG - 15 SN - 2073-4360 DO - 10.3390/polym15132937 UR - https://m2.mtmt.hu/api/publication/34081525 ID - 34081525 AB - In this work, the preparation and systematic investigation of cross-linked polyurethane-epoxy (PU-EP) polymer systems are reported. The PU-EP polymers were prepared using a reaction of isocyanate (NCO)-terminated PU-prepolymer with diglycidyl ether of bisphenol A (DGEBA)-amine cooligomer. The oligomerization of DGEBA was carried out by adding furfurylamine (FA) or ethanolamine (EA), resulting in DGEBA-amine cooligomers. For the synthesis of NCO-terminated PU-prepolymer, poly(ε-caprolactone)diol (PCD) (Mn = 2 kg/mol) and 1,6-hexamethylene diisocyanate (HDI) were used. The cross-linking was achieved by adding DGEBA-amine cooligomer to PU-prepolymer, in which the obtained urethane bonds, due to the presence of free hydroxil groups in the activated DGEBA, served as netpoints. During cross-linking, ethanolamine provides an additional free hydroxyl group for the formation of a new urethane bond, while furfurylamine can serve as a thermoreversible coupling element (e.g., Diels–Alder adduct). The PU-EP networks were characterized using attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC), dynamical mechanical analysis (DMA) and scanning electron microscopy (SEM). The DMA curves of some PU-EPs (depending on the compositions and the synthetic method) revealed a plateau-like region above the melting temperature (Tm) of PCD, confirming the presence of a cross-linked structure. This property resulted in a shape memory (SM) behavior for these samples, which can be fine-tuned in the presence of furfurylamine through the formation of additional thermoreversible bonds (e.g., Diels–Alder adduct). LA - English DB - MTMT ER - TY - JOUR AU - Zavori, Laszlo AU - Molnár, Tihamér AU - Várnai, Réka AU - Kanizsai, Andrea AU - Nagy, Lajos AU - Vadkerti, Bence AU - Szirmay, Balázs AU - Schwarcz, Attila AU - Csécsei, Péter TI - Cystatin-c May Indicate Subclinical Renal Involvement, While Orosomucoid Is Associated with Fatigue in Patients with Long-COVID Syndrome JF - JOURNAL OF PERSONALIZED MEDICINE J2 - J PERS MED VL - 13 PY - 2023 IS - 2 PG - 11 SN - 2075-4426 DO - 10.3390/jpm13020371 UR - https://m2.mtmt.hu/api/publication/33647476 ID - 33647476 N1 - Salisbury NHS Foundation Trust, Salisbury, SP2 8BJ, United Kingdom Department of Anaesthesiology and Intensive Care, Medical School, University of Pecs, Pecs, 7624, Hungary Department of Primary Health Care, Medical School, University of Pecs, Pecs, 7624, Hungary Department of Dentistry, Medical School, University of Pecs, Pecs, Pecs, 7624, Hungary Department of Applied Chemistry, University of Debrecen, Debrecen, 4032, Hungary Department of Laboratory Medicine, Medical School, University of Pecs, Pecs, 7624, Hungary Department of Neurosurgery, Medical School, University of Pecs, Pecs, 7624, Hungary Export Date: 13 November 2023 Correspondence Address: Szirmay, B.; Department of Laboratory Medicine, Hungary; email: szirmay.balazs@pte.hu LA - English DB - MTMT ER - TY - CONF AU - Vadkerti, Bence AU - Nagy, Lajos AU - Kuki, Ákos AU - Nagy, Tibor AU - Erdélyi, Zoltán AU - Kárpáti, Levente AU - Zsuga, Miklós AU - Kéki, Sándor TI - Information coding by peg - aliphatic isocyanate reaction and decoding by maldi-tof ms T2 - International Mass Spectrometry Conference 2022 : Poster Abstract book. PY - 2022 SP - 51 PG - 1 UR - https://m2.mtmt.hu/api/publication/33722396 ID - 33722396 LA - English DB - MTMT ER - TY - CONF AU - Vadkerti, Bence AU - Juhász, Anett AU - Lakatos, Csilla AU - Zsuga, Miklós AU - Kéki, Sándor AU - Nagy, Lajos ED - Majdik, Cornelia TI - Polimer poliolok és fenil-izocianát reakcióinak kinetikai vizsgálata T2 - XXVIII. Nemzetközi Vegyészkonferencia = 28th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2022 SP - 43 PG - 1 UR - https://m2.mtmt.hu/api/publication/33721336 ID - 33721336 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Vadkerti, Bence AU - Juhász, Anett AU - Lakatos, Csilla AU - Zsuga, Miklós AU - Kéki, Sándor AU - Nagy, Lajos TI - Reactivity of multi-arm polyols towards isocyanates JF - NEW JOURNAL OF CHEMISTRY J2 - NEW J CHEM VL - 46 PY - 2022 IS - 20 SP - 9871 EP - 9879 PG - 9 SN - 1144-0546 DO - 10.1039/D2NJ01103D UR - https://m2.mtmt.hu/api/publication/32920077 ID - 32920077 AB - In this research, the kinetics of the reaction of various polymer polyol crosslinking agents with phenyl isocyanate is reported. Pentaerythritol (PE), trimethylol propane (TMP), ethoxylated (PEEO) and propoxylated (PEPO) pentaerythritol oligomers as well as Petol PA 500-5D (a propoxylated diethylenetriamine with 5 arms) were used as crosslinking agents. These polyols were applied in high molar excess to isocyanate to obtain pseudo first-order rate dependencies. The reaction products were separated by HPLC and detected by UV absorption. It was found that trimethylol propane (kTMP = 0.0819 min−1), due to its electron donating group, was slightly more reactive than pentaerythritol (kPE = 0.0700 min−1). Moreover, ethoxylated and propoxylated derivatives were found to be less reactive than PE, which can be explained by the electron withdrawing property of the alkoxy groups. In addition, Petol PA 500-5D was determined to be the most reactive polyol, which is ascribed to the fact that it carries some catalytic properties similar to other tertiary amine catalysts. Furthermore, the reactions were also carried out in high isocyanate molar excess to polyols in order to determine how the number of reacted hydroxyl groups influences the reactivity of unreacted hydroxyl groups. The separation of the products could be achieved by HPLC for PE and TMP; however, in the case of PEEO, PEPO and Petol PA 500-5D, due to the high number of products, MALDI-TOF MS was applied. The results clearly showed that the reactivity of the unreacted OH groups significantly changed upon reaction in the case of PE and TMP, while for the polymer polyols, steric and inductive effects slightly modified the relative reactivities of the OH groups in each crosslinking agent. LA - English DB - MTMT ER - TY - JOUR AU - Lakatos, Csilla AU - Kordován, Marcell Árpád AU - Czifrák, Katalin AU - Nagy, Lajos AU - Vadkerti, Bence AU - Daróczi, Lajos AU - Zsuga, Miklós AU - Kéki, Sándor TI - Synthesis of Sucrose-HDI Cooligomers: New Polyols for Novel Polyurethane Networks JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 23 PY - 2022 IS - 3 PG - 13 SN - 1661-6596 DO - 10.3390/ijms23031444 UR - https://m2.mtmt.hu/api/publication/32699605 ID - 32699605 N1 - Funding Agency and Grant Number: National Research, Development and Innovation Fund of Hungary [GINOP-2.3.3-15-2016-00021, TKP2021-EGA-20]; National Research, Development, and Innovation Office (NKFI)National Research, Development & Innovation Office (NRDIO) - Hungary [TKP2021-EGA] Funding text: FundingThis work was supported by the GINOP-2.3.3-15-2016-00021 project, project no. TKP2021-EGA-20 (BIOTECHNOLOGY) has been implemented with the support provided from the National Research, Development and Innovation Fund of Hungary, financed under the TKP2021-EGA funding scheme, and a grant (No. FK-128783) from the National Research, Development, and Innovation Office (NKFI). LA - English DB - MTMT ER - TY - CONF AU - Vadkerti, Bence AU - Nagy, Lajos AU - Batta, Gyula AU - Fehér, Péter Pál AU - Zsuga, Miklós AU - Kéki, Sándor TI - Determination of relative reactivity of hydroxyl groups in sucrose T2 - Young Researchers’ International Conference on Chemistry and Chemical Engineering (YRICCCE III) Program and Abstracts PY - 2021 SP - 31 PG - 1 UR - https://m2.mtmt.hu/api/publication/33721184 ID - 33721184 LA - English DB - MTMT ER - TY - CONF AU - Vadkerti, Bence AU - Nagy, Lajos AU - Lakatos, Csilla AU - FEHÉR, Péter Pál AU - Zsuga, Miklós AU - Kéki, Sándor ED - Majdik, Cornelia TI - Ipari térhálósítók kinetikai funkcionalitásának és reaktivitásának meghatározása T2 - XXVII. Nemzetközi Vegyészkonferencia / 27th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2021 UR - https://m2.mtmt.hu/api/publication/32909834 ID - 32909834 AB - A térhálósítószerek vizsgálata a poliuretán kémiában kiemelkedő fontosságú. Célunk volt, hogy olyan térhálósítók reaktivitását vizsgáljuk, melyeket a vegyiparban gyakran használnak. Fenil-izocianátot reagáltattunk el szacharózzal, glicerinnel és szorbittal először izocianát, majd pedig térhálósító feleslegben. A kapott sebességi együtthatók felhasználásával meghatároztuk az említett anyagok kinetikai funkcionalitását. LA - English DB - MTMT ER -