Találati lista | Tudóstér

001-es BibID:	BIBFORM116035
035-os BibID:	(WoS)001048397500001 (Scopus)85169565923
Első szerző:	Juhász Anett
Cím:	The kinetics of uncatalyzed and catalyzed urethane forming reactions of aliphatic diisocyanates with butan-1-ol / Anett Juhász, Üneri Haymana Serra, Csilla Lakatos, Bence Vadkerti, Anita Rágyanszki, Ödön Farkas,Sándor Kéki, Lajos Nagy
Dátum:	2023
ISSN:	1144-0546 1369-9261
Megjegyzések:	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 systematically studied by electrospray ionization mass spectrometry (ESI-MS) in the off-line mode. The reactions were performed in toluene solution in the temperature range of 50?80 ?C and perdeuterated butan-1-ol was used for quenching the reaction. The butan-1-ol was employed in high excess to diisocyanates to obtain pseudo first-order rate coefficients. For rendering the kinetics, a simple A ? B ? C consecutive model was applied and found to adequately describe the observed kinetic behaviors. The corresponding rate coefficients were determined and reactivities of the diisocyanates were found to decrease in the order HDI > IPDI > HMDI. Furthermore, it was observed that the second isocyanate group in HDI, due to the ring formation by intramolecular hydrogen bonds, reacted faster with butan-1-ol after the first isocyanate moiety had reacted. The formation of hydrogen bonding rings was also confirmed by DFT calculations. However, the reactivity of the second isocyanate moiety (after the first one has reacted) did not change significantly in the case of HMDI. From the temperature dependences the apparent activation parameters such as the pre-exponential factors and activation energies were determined. In addition, the reactions were also studied at 80 ?C in the presence of tin(II)-2-ethylhexanoate at different concentrations and a mechanism was proposed for the catalytic process.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk HDI, HMDI
Megjelenés:	New Journal Of Chemistry. - 47 : 34 (2023), p. 16096-16107. -
További szerzők:	Üneri, Haymana Serra Lakatos Csilla (1990-) (környezetmérnök) Vadkerti Bence (1994-) (okleveles vegyészmérnök) Rágyanszki Anita Farkas Ödön Kéki Sándor (1964-) (polimer kémikus) Nagy Lajos (1979-) (vegyész)
Pályázati támogatás:	FK-128783 Egyéb TKP2021-EGA-20 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: