Onion-type morphology

Addition of a graft copolymers is much less frequent. Some blends of this type were reported to have unusual onion-like morphology. This observation is not universally valid — the com-patibilizing effect must depend on the structure and composition of the copolymer. Owing to complexity of the these structures the theoretical analysis has not been attempted. 

Let us note in addition that the layered sulfides M0S2 and WS2 have been found to form nanotubes and other fullerene-type structures, on account of their highly folded and distorted nature that favors the formation of rag and tubular structures. Such materials have been synthesized by a variety of methods [78] and exhibit morphologies, which were described as inorganic fiillerenes (IF), single sheets, folded sheets, nanocrystals, and nested IFs (also known as onion crystals or Russian dolls ). 

When such a soluble ABCP is mechanically blended with one of its components, unusual morphologies may arise. Eastmond and Phillips observed large spherical domains with an onion-ring-type structure in blends of a soluble polycarbonate/polychloroprene ABCP with polycarbonate. 

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