Demonstration: the specimens shown are (a) a piece of cured epoxy resin, (b) a rubber band, and (c) a strip of linear low density polyethylene (LDPE). Answer the followings: Specimen (a) is a rigid as a board and (b) is a very flexible elastomer, but they are both thermosets. What makes the difference in their mechanical behavior? Upon drawing pulling. specimens (b) and (c) will both (a) exhibit high levels of clongation. However, when the deforming force is removed, specimen (b) will instantly retract to its onginal shape and form, but specimen () will remain permanently deformed. Why? (b) (c)