Abstract
For three high molecular weight samples of poly(dimethylsiloxane), polybutadiene, and polyisoprene the self-diffusion for times smaller than the reptation time T rep was investigated using field gradient NMR in the stray field of a cryomagnet. A time-dependent apparent self-diffusion coefficient D app is observed with time exponents b of the power law D app ∼ t b between -0.57 and -0.73. These values are at variance with the strict reptation picture and support more recent theoretical concepts and computer simulations
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