Synthesis of PEG200-di-acetate and its influence on the viscosity of PEG4000 in different organic solvents

الملخص EN

Polyethylene glycol (PEG) of molar mass 200g / mol.

was esterificated to polyethylene glycol di-acetate (PEG200DAc) .The esterification was obtained by the modification of a reported procedure through changing the reaction temperature, time, mixing rpm, and the reactants molar ratio.

The resulting product was identified by FTIR-spectra.

Ubbelohde viscometer was used to study the influence of different weight percentages (0.1- 1.0) g /dL of PEG200DAc on the viscosity of PEG4000 in three good solvents, ethanol, cyclopentanon, and benzene, for a constant concentration of PEG4000 (2.5) g / dL at ambient conditions.

The study observed an increase in the viscosity of the solutions under investigation up to a critical concentration of PEG200DAc.

Above this critical concentration the viscosity decreases gradually as the concentration of PEG200DAc increases.