Shear induced vortices in high molecular weight polyethylene oxide melt

Gałęski, Andrzej; Płoszajski, J.; Fajtelson, L. A.; Κryszewski, M.

doi:10.1007/bf00256794

Cited by 3 publications

(1 citation statement)

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“…Several other types of experimental studies − have been carried out to investigate the viscosity of PEO directly, but the macroscopic viscosity is not expected to be related to the structural (α) relaxation for a partly crystalline material, since the Maxwell relation is only valid for fully amorphous samples. Thus, although macroscopic viscosity measurements could still be interesting to perform, it is not likely that such measurements can be used to determine segmental polymer dynamics in the case of substantially crystalline polymers.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Poly(ethylene oxide) around Its Melting Temperature

Money

Swenson

2013

Macromolecules

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This study has focused on the ionic conductivity (of impurities) and the changes in relaxation behavior of semicrystalline poly(ethylene oxide) (PEO) around its melting temperature of the crystalline regions. Our main aim was to understand the implications of nucleation and growth of spherulitic structures on the general dynamical properties of the polymer chains and how these dynamical alterations affect the ionic conductivity. Impedance data have been scaled and analyzed under conductivity and modulus formalisms over wide ranges of frequency and temperature. The analysis of the scaled formalisms indicates that both the conductivity and the structural relaxation mechanisms are temperature independent above the melting point of PEO. However, below the melting point, the slow crystallization of PEO leads to growth of spherulites and also to the formation of "interphase" regions. These morphological changes result in a hindered long-range dc conductivity, which, in turn, leads to a decoupling of the dc conductivity and the structural relaxation below the melting point of PEO.

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Section: Introductionmentioning

confidence: 99%