Abstract
A new technique for quantifying the amount of multimolecular microgel material in water-soluble polymers is described. The enhanced velocity of the large microgels during flow through a 25 μm capillary is the basis for a separation between the microgels and dissolved polymer. With the use of laser-excited fluorescence detection, the arrival of fluorescently-tagged polyacrylamide samples at a downstream location is recorded. The presence of small amounts of microgel has a deleterious effect on the ability to filter polymer solutions. Analysis of samples before and after filtration suggests that a significant amount of microgel material above 8 μm in diameter is present in samples that exhibit poor filterability characteristics. Treatment of a sample with base is found to improve filterability and to decrease the amount of microgel in the sample.
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