Influence of Carbon Fibre Addition, Ultrasonication and Vacuum Processing on the Mechanical and Conductive Properties of Expanded Graphite Polyester Resin Composites.

A multiple linear regression of resistivity versus CF wt% and EG wt% within the hybrid family yields a very strong overall fit (R 2 ~ 0.94), with a highly significant negative coefficient for EG wt% (about −0.63 decades per 1 wt% EG) and a near-zero, non-significant coefficient for CF wt%.

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The CF-only composites exhibited high max loads; although the difference relative to the neat resin did not reach statistical significance at α = 0.05 in the Tukey test, the mean max load was numerically lower by ~400 N, indicating a substantial practical reduction.

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