Polymer degradation has been studied for a variety of degradation conditions using size exclusion chromatography (SEC) to monitor the progress of the degradation reactions. SEC measures the molecular size of polymer degradation products. Changes in polymer degradation result in the changes in the size of polymer degradation products. In this research, the study of hydroxypropyl guar (HPG) degradation has been emphasized since this polymer is most commonly used in fracturing fluids. The SEC studies have been used to help understand the mechanisms of polymer degradation and to suggest ways to design better breaker systems.

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