The interaction energy values carry a negative sign which indicates attraction to the aromatic surface of the flCNT. Therefore, higher negative values indicate greater polymer/surface affinity. Figure shows dramatic increases in interaction energy for all the three systems, both monomer and polymer, with increases in polymer mass fraction, except for the polymerized benzoxazine system. For the epoxy system, the data in Figure indicates the strengthening of interaction depends highly on the effective saturation of the polymer-flCNT interface. The initial increase is significant and is due to clustering of polymer molecules at the interface for lower mass fractions, which is evident from Figure .