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- W2042188066 abstract "Segmental dynamics of relatively short linear polymers are discussed in terms of two distinct contributions, one related to the local segmental motion (α relaxation) and the other to polymer-specific effects that reflect Brownian dynamics of the polymer under chain connectivity constraints (Rouse relaxation modes). These two aspects of polymer dynamics are reflected, though differently, in relaxation spectra of different experimental techniques. Two contrasting cases of the (collective) dipolar response (dielectric techniques) versus the individual segmental response (e.g., NMR spin-lattice relaxation spectroscopy) are considered. The second-rank orientational correlation function of an elementary (Kuhn) segment, directly related to NMR observables, is derived in terms of Rouse normal modes. The effect of α dynamics is estimated under the assumption of a separation of time scales which, as it is argued, is a necessary precondition of the Rouse approach. The relative magnitude of the polymer-related dynamics is expressed through the number of elementary Rouse units in the chain and the number of Kuhn segments in a Rouse unit. The results are discussed in the context of recent literature." @default.
- W2042188066 created "2016-06-24" @default.
- W2042188066 creator A5091144158 @default.
- W2042188066 date "2008-03-10" @default.
- W2042188066 modified "2023-09-27" @default.
- W2042188066 title "Segmental versus chain dynamics of linear polymers" @default.
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- W2042188066 doi "https://doi.org/10.1063/1.2835603" @default.
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