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- W2023631434 abstract "The plateau zone in the dynamic modulus of large chain polymer melts characterizes most strikingly their viscoelasticity reflecting the rubber-like properties of entangled chains. In this paper we shall summarize neutron spin-echo experiments which unravel the underlying microscopic large scale chain motions. NSE thereby facilitates a space-time analysis of the density fluctuations in a labeled chain among equals. The experiments show the microscopic existence of an intermediate dynamic length scale, related to the rubbery plateau. Scaling models of entanglement formation are scrutinized by systematically varying the two length scales considered to be important. Diluting with oligomers changes the contour length density. A temperature variation changes the Kuhn length. The NSE results favour binary contact models and exclude packing models. Finally, the build-up of entanglements at the crossover from Rouse to entanglement behavior is addressed by varying the chain length." @default.
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- W2023631434 date "1993-01-01" @default.
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- W2023631434 title "Large scale motion in polymer melts, a neutron spin–echo study" @default.
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- W2023631434 doi "https://doi.org/10.1088/0031-8949/1993/t49a/041" @default.
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