Two Multiblock Copolymer Blends
I. INTRODUCTION The possibility o f obtaining a homogeneous (one-phase) structure o f blends o f two or more polymers is limited because most macromolecular components are im miscible. According to the classical Flory-Huggins-Scott theory, the high molec ular weights and the differences in chemical structures o f the polymers are the de ciding factors ( l ). A system is said to be compatible when one o f its components is a diblock (AB) or a triblock (ABA) copolymer in which one o f the blocks has the same structure as the other component (homopolymer A or B). Many experi mental and theoretical studies (2-4) have been devoted to the solution o f this prob lem (see also: Chapters 11 and 18).