It can be seen from Figure 3 d that within the range of 7.5 g to 17.5 g of boric acid dosage, the viscosity showed a trend of first increasing and then decreasing, reaching a peak at 12.5 g (104 mPa·s).
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Synthesis and Performance Evaluation of Polyamine Boron Crosslinker for Gel Fracturing Fluid.
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The sentences
This indicated that the established second-order multiple regression model was highly significant.