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• W2034266905 endingPage "498" @default.
• W2034266905 startingPage "490" @default.
• W2034266905 abstract "13C NMR T1, NOE, and T1ρ were measured for two unentangled polyethylene melts (C44H90 and Mw = 2150 g/mol) at 5, 25, and 75 MHz 13C Larmor frequency from the melting points up to 260 °C. The data were fit with a model composed of a fast segmental relaxation and a long time tail described by Rouse modes. The fitting parameters are consistent with MD computer simulations on similar systems and independent experiments such as viscosity and self-diffusion coefficient measurements. Polyethylene is an unusual polymer in that it has a very pronounced long time tail in the C−H vector correlation function. This long time tail makes this experiment a sensitive tool with which to characterize the global dynamics of polyethylene melts. Rouse modes, with corrections suggested from MD simulation, were found to be an adequate description of the global dynamics in this molecular weight range. The activation energy for the conformational dynamics was found to be 4 kcal/mol, which is significantly less than the flow activation energy. Therefore, in contrast to some other well-studied examples, conformational transitions are not the fundamental motions for flow in polyethylene. MD computer simulations of C44H90 [Smith et al. Macromolecules 1995, 28, 5897] using an explicit atom model closely reproduce the experimental data." @default.
• W2034266905 created "2016-06-24" @default.
• W2034266905 creator A5013003564 @default.
• W2034266905 creator A5041667858 @default.
• W2034266905 date "1999-12-28" @default.
• W2034266905 modified "2023-09-27" @default.
• W2034266905 title "Local and Global Dynamics of Unentangled Polyethylene Melts by ¹³C NMR" @default.
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• W2034266905 doi "https://doi.org/10.1021/ma991086n" @default.
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