Therefore, when MPA is introduced, the starting tree voltage initially shows a decreasing trend with a decrease in the free volume ratio.
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Electrical Tree Characteristics of Bisphenol A Epoxy Resin/Maleopimaric Anhydride Curing System.
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The sentences
The relevant experimental findings are as follows: With an increase in MPA content, the free volume percentage of the curing system showed a trend of initially increasing and then stabilizing.
With an increase in MPA content, the total energy and van der Waals force of the epoxy system both showed an increasing trend.