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- W1541756090 abstract "Publisher Summary This chapter discusses the molecular properties that underlie the linear viscoelastic behavior of molten polymers. Properties are probed from proton magnetic dipoles attached to polymeric chains or to small molecules in concentrated polymeric solutions. The magnetic relaxation of protons linked to polymer molecules is sensitive to collective rotational isomerizations, which occur along one chain. Orientational correlations of monomeric units give rise to relaxation mechanisms specific to polymeric systems, studied above the glass transition temperature. A deep insight into dynamic properties is provided by observing the irreversible behaviour either of the proton transverse magnetization or of the longitudinal component. Most experimental results obey a time-scaling analysis; the time scale is governed by a friction coefficient for local observations or by the presence and the life-time of entanglements for semi-local observations. Both nuclear magnetic resonance (NMR) and viscoelastic responses of polymers manifest a dual behavior; this appears as liquid-like and solid-like magnetic relaxations while it corresponds to viscosity and elasticity for flowing systems. The general character of nuclear magnetic relaxation properties arises from the statistical average that applies to monomeric units along one chain." @default.
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- W1541756090 date "1996-01-01" @default.
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- W1541756090 title "Polybutadiene: NMR and temporary elasticity" @default.
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- W1541756090 doi "https://doi.org/10.1016/s0169-3107(96)80003-7" @default.
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