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- W1984849625 abstract "13C NMR T1, NOE, and T1ρ were measured for an atactic polypropylene (aPP) melt at 5, 25, 75, and 125 MHz 13C Larmor frequencies from 43 °C to 260 °C. The data were fit very well with a model for C–H vector reorientation composed of very fast librational relaxation, intermediate segmental relaxation, and a normal mode contribution described by Rouse dynamics modified for entanglement effects. The longest relaxation time calculated from this fit agrees reasonably well with the value obtained from viscoelastic measurements on similar systems. The amplitude of the normal mode contribution for aPP is much smaller than that found for polyethylene in a previous study. The temperature dependence of the segmental dynamics is very similar to that of the viscosity indicating that conformational transitions are the fundamental motions for flow for aPP. The width of the distribution of relaxation times of segmental dynamics remains unchanged at about 1.3 decades from Tg+45 to Tg+250 K." @default.
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- W1984849625 date "2000-08-15" @default.
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- W1984849625 title "Local and global dynamics of atactic polypropylene melts by multiple field 13C nuclear magnetic resonance" @default.
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- W1984849625 doi "https://doi.org/10.1063/1.1305889" @default.
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