A thermoset rubber composition includes a thermoset rubber having crystalized domains dispersed therein, the crystalized domains being formed of supramolecule building blocks forming a plurality of sheet-like structures through hydrogen bonding, the sheet-like structures interacting through non-covalent interactions to form the crystalized domains within the thermoset rubber. The supramolecular building blocks may be peptides, β-peptides, aramid oligomers, and bis-ureas.