Abstract
Pulsed n.m.r. T 1, T 2 and T 1 ϱ results are reported for a macroscopic single crystal of styrene—butadiene—styrene copolymer, recorded as a function of the angle between the extrusion axis of the sample and the magnetic field direction. The data confirm the absence of molecular orientation in either component of the copolymer. T 1 and T 1 ϱ results indicate a coupling via spin diffusion, between the polystyrene and polybutadiene regions. These spin diffusion effects are analysed in terms of a simple model, presented earlier, which demonstrates a stronger spin diffusion coupling in the rotating frame than in the laboratory frame.
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