Abstract
The formation of spin-echoes in the Carr-Purcell-Meiboom Gill (CPMG) NMR experiment on rubbery polybutadiene (PBD) has been studied as a function of temperature and CPMG inter-pulse spacing. The influence of internal field gradients, and of diffusional motion of the polymer segments during the inter-pulse periods is demonstrated. The CPMG decays are well described by diffusion equations for the case of diffusion of particles through connecting cylinders. Microscopic voids of diameter of ∼ 0.5 nm adjacent to the reptating chain segments are suggested to be responsible for the magnetic field gradients.
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