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- W2031815030 abstract "We report dielectric normal-mode relaxation of probe cis-polyisoprenes (PI) in dilute blends of PI and polybutadiene (PB) with broad molecular weight distributions (MWD). The PB matrixes included two binary PB blends of narrow-MWD PBs and one mixture of seven narrow-MWD PB fractions. Results were compared with our previous results on narrow-MWD PI/PB blends (Macromolecules 1995, 28, 3588) in which the double-logarithmic plot of the longest relaxation time τ of PIs against their molecular weights, MI, conformed to a straight line with the slope varying from 2 (the Rouse behavior) to 3 (pure reptation) with increasing MW, MB, of the matrix PBs. The plots for the broad-MWD blends also conformed to straight lines, indicating that the broad-MWD matrix is equivalent to a narrow-MWD matrix of an equivalent molecular weight Mequiv. However, as compared with the same weight-averaged MB, the slopes are slightly smaller than those of the narrow-MWD blends, suggesting that the small MW matrix chains accelerate the rate of relaxation of the probe chain. The behavior cannot be explained quantitatively by the constraint-release model proposed by Graessley. We also examined the shape of the dielectric loss ε‘‘ versus frequency f curve. All ε‘‘ curves observed here are broader than the prediction of the Rouse and Doi−Edwards theories which predict that the slope of the log ε‘‘ vs log f curve is −0.5 on the high-frequency side of the loss peak." @default.
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- W2031815030 title "Dielectric Spectroscopy on Dilute Blends of Polyisoprene/Polybutadiene: Effect of the Matrix Polydispersity on the Dynamics of Probe Polyisoprene" @default.
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- W2031815030 doi "https://doi.org/10.1021/ma960222a" @default.
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