Synthesis of polyethene–graft–polystyrene copolymers from linear polyethene-containing cyclopropane rings

Abstract

An efficient procedure to produce polyethene–graft–polystyrene (E-C3–graft–PS) copolymers by simple thermal treatment at 200 °C of polyethene (PE)-containing cyclopropane ring units (E-C3) in the presence of a high excess of styrene is reported. The high treatment temperature likely induces the breaking of the constrained cyclopropane rings, leading to the formation of radicals on the PE chains. The presence of styrene during the thermal treatment allows the formation of side polymer chains on the starting materials and, consequently, of graft copolymers. The graft copolymers that were obtained are efficient compatibilizers for polymer blends as was determined from scanning electron micrographs, which were used to examine the bulk morphologies of two blends: one composed of 50/50 PE and polystyrene (PS), and the other of 49/49/2 PE, PS and E-C3–graft–PS. An efficient procedure able to give polyethene–graft–polystyrene copolymers obtainable by simple thermal treatment at 200 °C of a polyethene-containing cyclopropane ring units in the presence of a high excess of styrene is reported. The high treatment temperature likely induces the breaking of the constrained cyclopropane rings leading to the formation of radicals on the polyethene chains. The presence of styrene during the thermal treatment allows the formation of side polymer chains on the starting materials and, consequently, of graft copolymers. The graft copolymers obtained resulted to be efficient compatibilizers.