DILUENT EFFECT OF THE POLY(ETHYLENE-alt-PROPYLENE) (PEP) BLOCK UPON THE POLYETHYLENE (PE) THERMAL FRACTIONATION OF PE-block-PEP DIBLOCK COPOLYMERS

摘要

The diluent effect of the amorphous (rubbery) PEP block upon the SSA thermal fractionation of the PE component as compared with the PE homopolymer was evaluated. The shape and distribution of the melting peaks obtained after applying the SSA protocol is notably different in the PE-b-PEP diblock copolymers. It has been established how the presence of a diluent blended with the amorphous zones of this semicrystalline polymer trends to increase the molecular mobility of PE chains in such a way that fractions closer to thermodynamic equilibrium can be generated.