A large number of DFT approaches, including classical GGA approximations, hybrid HF/DFT approaches, and more recent tau -dependent functionals, have been tested for olefin polymerization reactions at a cationic aluminum system, and their results have been compared with refined post-HF methods. The results show that hybrid density functional methods always outperform classical GGA approaches, and more recent tau -dependent functionals are not yet competitive, providing nonsystematic errors in the energy evaluations. The effect of the lengthening of the polymer chain from the "standard" ethyl group to a butyl group was found to be significant and hence has to be taken into account when predicting the molecular weight of polymers. A computational strategy to study olefin polymerization at Al systems is proposed
Modelling polymerisation reaction at aluminium based catalysts: is DFT a reliable computational tool? / Talarico, Giovanni; Barone, V; Budzelaar, Petrus Henricus Maria; Adamo, C.. - In: JOURNAL OF PHYSICAL CHEMISTRY. A, MOLECULES, SPECTROSCOPY, KINETICS, ENVIRONMENT, & GENERAL THEORY. - ISSN 1089-5639. - STAMPA. - 105:(2001), pp. 9014-9023. [10.1021/jp011334t]
Modelling polymerisation reaction at aluminium based catalysts: is DFT a reliable computational tool?
TALARICO, GIOVANNI;BUDZELAAR, Petrus Henricus Maria;
2001
Abstract
A large number of DFT approaches, including classical GGA approximations, hybrid HF/DFT approaches, and more recent tau -dependent functionals, have been tested for olefin polymerization reactions at a cationic aluminum system, and their results have been compared with refined post-HF methods. The results show that hybrid density functional methods always outperform classical GGA approaches, and more recent tau -dependent functionals are not yet competitive, providing nonsystematic errors in the energy evaluations. The effect of the lengthening of the polymer chain from the "standard" ethyl group to a butyl group was found to be significant and hence has to be taken into account when predicting the molecular weight of polymers. A computational strategy to study olefin polymerization at Al systems is proposedI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.