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• W2021176258 abstract "We utilize NMR field cycling relaxometry to study the crossover from glassy dynamics ($tensuremath{gtrsim}{ensuremath{tau}}_{ensuremath{alpha}}$) through Rouse to reptation behavior in a series of monodisperse polybutadienes with molecular weights $M=355$ to $817text{ }000text{ }text{ }mathrm{g}/mathrm{mol}$. We separate characteristic polymer dynamics from the total spectrum dominated by glassy dynamics. The polymer dynamics show typical Rouse relaxation features that grow with $M$ and saturate at high $M$. Comparing to Rouse theory, we determine the Rouse unit size ${M}_{R}ensuremath{simeq}500$ and entanglement weight ${M}_{e}ensuremath{simeq}2000$; the Rouse spectrum saturates at ${M}_{mathrm{max}}ensuremath{simeq}4000$. The local order parameter $Sensuremath{approx}0.11$ is relatively large, indicating noticeable local packing already in the Rouse regime. The $M$ dependence of the glass transition temperature ${T}_{g}$, obtained from dielectric relaxation spectra, shows distinctive kinks at ${M}_{R}$ and ${M}_{e}$." @default.
• W2021176258 created "2016-06-24" @default.
• W2021176258 creator A5057499587 @default.
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• W2021176258 date "2006-11-17" @default.
• W2021176258 modified "2023-09-27" @default.
• W2021176258 title "From a Simple Liquid to a Polymer Melt: NMR Relaxometry Study of Polybutadiene" @default.
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• W2021176258 doi "https://doi.org/10.1103/physrevlett.97.207803" @default.
• W2021176258 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17155717" @default.
• W2021176258 hasPublicationYear "2006" @default.
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