The various levels of organisation which may be distinguished in non-crystalline block Copolymers are considered. An account is given of the application of lowangle X-ray diffraction and electron microscopy to the characterisation of the two-phase morphology and grain texture of some styrenelisoprene copolymers. The first group of copolymers to be considered contains two series of samples of the type S-I, (S-I-)2X, (S-I-)aY, and (S-I-)4Z where I is polyisoprene, S polystyrene and X, Y and Z are di-, tri-and tetra-functional coupling groups. The second group of copolymers which was subjected to a less detailed study than the first consists of just two polystyrene-g-polyisoprene samples.
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