dc.contributor.author |
Decortes, Antonello |
dc.contributor.author |
Haak, Robert M. |
dc.contributor.author |
Martín, Carmen |
dc.contributor.author |
Martínez Belmonte, Marta |
dc.contributor.author |
Martin, Eddy |
dc.contributor.author |
Benet-Buchholz, Jordi |
dc.contributor.author |
Kleij, Arjan W. |
dc.date.accessioned |
2019-05-24T09:56:59Z |
dc.date.available |
2019-05-24T09:56:59Z |
dc.date.issued |
2015-11-11 |
dc.identifier.uri |
http://hdl.handle.net/2072/356265 |
dc.format.extent |
8197 p. |
dc.language.iso |
eng |
dc.rights |
L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by-nc-nd/4.0/ |
dc.source |
RECERCAT (Dipòsit de la Recerca de Catalunya) |
dc.subject.other |
54 |
dc.title |
Copolymerization of CO2 and Cyclohexene Oxide Mediated by Yb(salen) Based Complexes |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/acceptedVersion |
dc.embargo.terms |
12 mesos |
dc.identifier.doi |
10.1021/acs.macromol.5b01880 |
dc.rights.accessLevel |
info:eu-repo/semantics/openAccess |
dc.description.abstract |
New catalysts based on Yb(salen) complexes active for the copolymerization of
cyclohexene oxide (CHO) and CO2 to give poly(cyclohexene)carbonate (PCHC) are reported. In combination with co-catalytic, nucleophilic chloride additives these new (binary) catalysts provided good conversion and selectivity for PCHC formation with average turnover frequencies of up to 35 h-1 and narrow molecular weight distributions. The best results were obtained with the binary catalyst system 1 (0.1 mol%)/NBu4Cl (0.05 mol%), and at 90 °C a conversion of 57% was reached after 18 h with a TOF of 31 h1, and the polycarbonate had an Mn of 10.2 Kg/mol and a PDI of 1.54. Comparative catalysis studies have also been performed with a series of literature systems based on transition metal/lanthanide salen complexes, and the newly presented catalysts show comparatively good activity as well as copolymerization selectivity. MALDI-ToF mass spectrometric analysis revealed that trace water contamination and/or traces of 1,2-cyclohexane- diol were responsible for chain transfer effects limiting to some extent the maximum molecular weights that can be achieved in the current reactor set up. |