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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 . State the effect of molecular weight change on the primary and secondary relaxations of polypropylene glycol

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