Abstract
A block copolymer is defined as a polymer comprising molecules in which there is a linear arrangement of blocks, a block being defined as a portion of a polymer molecule in which the monomeric units have at least one constitutional or configurational feature absent from the adjacent portions.1, 2 In a block copolymer, the distinguishing feature is constitutional, i.e. each of the blocks comprises units derived from a characteristic species of monomer. This definition excludes branched structures in which the branches are composed of blocks, i.e. star or radical block copolymers. This review will consider the synthesis, characterization and morphology of both linear and star block copolymers with well-defined structures.
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