01963nas a2200217   4500008004100000022001400041245011300055210006900168260010100237300001200338490000800350520108300358653002801441653002001469653003301489653002801522653002801550100002001578700002101598856012601619       2014                        eng d  a0974-362600aSolid, double-metal cyanide catalysts for synthesis of hyperbranched polyesters and aliphatic polycarbonates0 aSolid doublemetal cyanide catalysts for synthesis of hyperbranch  aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbCatalysis Soc IndiacMAR  a499-5090 v1263 a<p>Fe-Zn and Co-Zn double-metal cyanide (DMC) complexes exhibit highly efficient and selective catalytic activity for synthesis of hyperbranched polyesters (glycerol succinic acid (G-SA) and glycerol adipic acid (G-AA)) and aliphatic polycarbonates (via., alternative co-polymerization of cyclohexene oxide and CO2), respectively. The influence of method of preparation of DMC, in particular the mode of addition of reagents, on its physicochemical and catalytic properties was investigated. Co-Zn DMC was found highly selective for polycarbonate (than polyethers) formation. Catalysts prepared using tert-butanol and PEG-4000 as complexing and co-complexing agents, respectively, were found superior to those prepared without these agents. Apart from its role as a coordinating ligand, tert-butanol activated the Lewis acidic Zn2+ sites for reactions in polyester and polycarbonate formation. Hydrophobicity, micro-mesoporosity, acid strength and the amount of coordinated complexing agent are some of the crucial factors influenced the catalytic activity of DMC complexes.</p>10aaliphatic polycarbonate10aCO2 utilization10aDouble-metal cyanide complex10aheterogeneous catalysis10ahyperbranched polyester1 aSebastian, Joby1 aDarbha, Srinivas  uhttp://library.ncl.res.in/content/solid-double-metal-cyanide-catalysts-synthesis-hyperbranched-polyesters-and-aliphatic-0