Block polymers. Characterization and use in polymer blends

Polymer blends, because of the well‐known immiscibility of polymers, generally show phase separation. Block polymers can be considered as simple models of two‐phase systems. Because unlike segments are connected by covalent bonds, the phase separation is on a smaller scale and takes rather unusual forms. The types of block polymers of commercial importance are described with a consideration of the morphologies which result from particular compositions. Their use as solubilizing agents to increase the compatibility of the corresponding homopolymers is also discussed.