Copolymer

Its main mechanic property is resistance to shocks. Copolymer polypropylene can have random or crystalline organization. Block copolymers have an advantage over random copolymers in that a crystal- line polymer can be modified without significant reduction of its melting point, modulus, tensile strength, and elastic proper- ties, and by suitable selection of a second component it affords a means of “building in” a particular property.