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Explain the effect of the molecular weight change from 400 to 4000 and more of polypropylene glycol on the normal mode and the structural relaxation

Explain the effect of the molecular weight change from 400 to 4000 and more of polypropylene glycol on the normal mode and the structural relaxation using a dielectric spectra and the effect of this on the relaxation time. Shown the relationship between the increase of molecular weight and the normal mode, structural relaxation and the relaxation time of polypropylene glycol

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