Novel application of a Fe–Zn double-metal cyanide catalyst in the synthesis of biodegradable, hyperbranched polymers

Abstract

The use of Fe-Zn double-metal cyanide as a solid catalyst for synthesizing biodegradable, hyperbranched polymers from diacids and glycerol has been reported, for the first time, wherein acidity, micro-mesoporosity and hydrophobicity of the catalyst played an important role in controlling gelation.

Solid, double-metal cyanide catalysts for synthesis of hyperbranched polyesters and aliphatic polycarbonates

“…Inverse-gated 13 C nuclear magnetic resonance (NMR) spectroscopy was used to analyse DB of the hyperbranched polymer. 8,26 The measurements were done on a Bruker Avance 500 NMR spectrometer. The various branching and linear segments of the polymer were assigned with the help of distortionless enhancement polarization transfer (DEPT) experiments.…”

“…2.1a Hyperbranched polyesters: Polyesterification reactions were carried out in a glass reactor placed in a temperature-controlled oil bath. 8,26 No solvent was used during the polymerization step. Known quantities of diacid (SA or AA) and glycerol (G) were added to the reactor.…”

“…Recently, we demonstrated that Fe-Zn double-metal cyanide (DMC) is an efficient and reusable, solid acid catalyst for producing glycerol-succinic acid (G-SA) and glyceroladipic acid (G-AA) hyperbranched polyesters. 8 G-SA and G-AA polyesters with high DB at controlled gelation and high conversion of glycerol were obtained over the DMC catalyst.…”

Synthesis of fatty monoester lubricant base oil catalyzed by Fe-Zn double-metal cyanide complex

“…Nitrogen-physisorption and high resolution transmission electron microscopy (HRTEM) studies revealed that DMC is mostly microporous but has some mesoporosity of less ordered nature in its structure. 21 Diffuse reflectance Fourier transform infrared (DRIFT) spectra of adsorbed pyridine and temperatureprogrammed desorption of ammonia (NH 3 -TPD) pointed out that it is Lewis acidic. 19 ,22 Tetrahedrally coordinated Zn 2+ are the sites of Lewis acidity which were active in transesterification reactions.…”

Novel application of double metal cyanide in the synthesis of hyperbranched polyether polyols

“…But the hyperbranched polyether polyols catalyzed by DMC catalysts are still rarely reported. DMC catalyst in the synthesis of hyperbranched polyesters was first reported in 2011 by Sebastian and Srinivas [15]. According to the catalyst, the types and the amount of oxygen atoms coordinated to Zn play an important role in the polymerization of propylene oxide (PO), because oxygen atoms coordinated to zinc ions are believed to be real active centers [16].…”