Ein Beitrag zur Temperaturabhängigkeit der Viskosität wäßriger Polyethylenglykollösungen

Abstract

ZUSAMMENFASSUNG:Mit SUMMARY:An automatic falling ball viscosimeter of the HOppler type with pneumatic rotary actuator and electrical time measuring was used to determine the viscosity of aqueous polyethylene oxide solutions between the temperature range of 20 to 8OOC. For these investigations polyethylene oxide fractions were used having molecular weights of 600 t o 20000 g/mol. The concentration of the solutions was up to 5 base mol-% of polymers.Parameters according to Eyring-and Vogel-equations were evaluated by the measured viscosity data. This evaluation led to the result, that the parameter T, decreased linearly with increasing molecular weight and concentration. The effect was explained by the water-structure-breaking by means of the polymer molecules.The logarithmic intrinsic viscosity in the solutions containing water and polyethylene oxide of a molecular weight of 6000 g/mol decreased rapidly with the temperature and led to a value of -8.6.