I have incorporated five wt% of rGO filler within the DGEBA resin and all composition except one have higher modulus and lower elongation. But that 30 wt% composition has opposite characteristics.
Have you thought of phase composition? Is it possible that at lower rGO concentrations you have a homogeneous composite, and at high concentrations phase separation occurs (large rGO aggregates withing the polymer phase)?
Sir you are correct but with minimum conc. of rGO i found higher strength, lower modulus and higher elongation. What is the relation of phase separation with elongation of composites?
A low concentrations, rGO is homogeneously distributed withing the resin, and the composite has improved mechanical characteristics. At high rGO concentrations, phase separation can occur: rGO forms a separate phase ("grains") within the polymer. This composite breaks easier, since it lost homogeneity.
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