speeding up Polymer Analysis英文文献资料.pdf

::: Application Report Speeding up Polymer Analysis The viscosity measurement of polymer solutions is a standard QC method in the polymer industry. Microwave-assisted dissolving can be very helpful in reducing dissolving times of certain polymers. Subsequent viscosity measurement with AMVn decreases the overall solvent consumption by a factor of 3. Additionally, both instruments are ready for automated operation. 1 Introduction One important issue in the dissolution process is the possible degradation of the polymers at increasing 1.1 General temperature. To ensure the integrity of the investigated polyamides (PA), standards were prepared according to Viscometry is a classic method for characterizing polymers conventionally applied methods. in solution. When dissolving polymers in a solvent, the solutions viscosity is higher than that of the pure solvent. By this increase of viscosity a polymers mass can be According to the ISO 307 standard the viscosity number specified. There is a definite relationship between average determination of polyamides has to be made after molar mass and the relative increase of viscosity in dilute dissolving 0.25 g polyamide in concentrated sulfuric acid to solution. obtain a 0.500 % solution. The samples are stirred with a