Abstract
Ionic liquids immobilized onto structurally modified polyethylene glycol (PEG) were prepared through the reaction of 1-(2-hydroxyl-ethyl)-3-alkyl-imidazolum chloride and PEG-succinic acid. Elemental analysis, SEM, C-13 NMR and FT-IR showed that the immobilized ionic liquid groups were well incorporated onto the PEG support. The PEG-supported ionic liquids (PEG-IL) proved to be an effective heterogeneous catalyst for the solventless synthesis of cyclic carbonate from allyl glycidyl ether (AGE) and carbon dioxide. PEG of lower molecular weight had higher conversion of AGE. High temperature and carbon dioxide pressure and the presence of zinc halide co-catalyst were favorable for AGE conversion. PEG-IL can be reused for the reaction through up to three consecutive runs without significant loss of its catalytic activity. (C) 2012 Elsevier Ltd. All rights reserved.