The effect of liquid natural rubber as toughening agent in epoxy/LNR/CB composite

Liquid natural rubber (LNR) was used as the toughening agent to overcome the brittleness of epoxy thermoset matrix. The LNR were prepared by using depolymerization method. The experiment was consist of two parts of study, first, epoxy filled with carbon black to get the optimun 15 vol.% content of carbon black (CB). Second, epoxy with various amount LNR and at 15 vol.% CB content. This can be seen from the result of flexural properties testing, fracture toughness testing and SEM morphology. The best properties of LNR as toughening as 4 phr because it gave optimun performance compared to others LNR content.