(5) 𝑰𝑬 𝟏,𝟐 = 𝑬(𝟏, 𝟐) -(𝑬 𝟏 + 𝑬 𝟐 ) Figure shows the comparison between the contact angle values of the bisphenol-F based epoxy systems. It can be clearly observed that the contact angle values decrease linearly with increases in temperature. The contact angle values for the bisphenol-F epoxy with the aromatic hardener are consistently lower than those with the aliphatic hardener. The difference in the contact angle values is consistent throughout the temperature range and is observed to be nearly 6 degrees. It is clear that the bisphenol-F epoxy with the aromatic hardener shows better wettability than the aliphatic hardener system on BNNT surface. The stoichiometric ratios of resin to hardener for the aromatic and aliphatic hardener systems is 2:1 and 5:2, respectively. The lower resin to hardener ratio of the aromatic hardener system allows for greater mobility of the epoxy monomers due to the relatively lower number of longer resin molecules. Conversely, the aliphatic hardener system with a relatively higher number of resin molecules is subjected to greater levels of steric hindrance. This variability in the mobility of the epoxy monomers allows the epoxy in the aromatic hardener system to more easily spread onto the BNNT surface, resulting in greater wettability. The IE contributed by the phenyl rings in the aromatic hardener system is 303 kcal/mol greater than that of the aliphatic hardener system at 147 °C. This shows that phenyl rings energetically favor the BNNT surface allowing monomers to spread onto the BNNT surface, resulting in lower contact angle values. Increases in the IE contributed by the epoxide groups in the aliphatic hardener system is because of the higher ratio of epoxy to hardener monomers. Figure shows the comparison of contact angle values of all the epoxy systems studied herein. Overall, the bisphenol-A epoxy systems show better wettability than the bisphenol-F epoxy systems at 87 °C, 117 °C, and 147 °C. The only exception is at 177 °C, where the bisphenol-F system with the aromatic hardener shows better wettability than the bisphenol-A system with the same hardener.