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- W2164769685 abstract "Summary: Solid-state 2H NMR spectroscopy was used to examine the chain dynamics of perdeuterated poly(oxyethylene) (d-POE) inside α-cyclodextrin (α-CD) nanotubes. The nanotubes were prepared by aqueous self-assembly of α-CD onto either low-molecular-weight (1.5 kg/mol) or high-molecular-weight (25.8 kg/mol) monodisperse d-POE. At a given temperature, POE chain segments exhibit faster dynamics when included inside the CD nanotubes as compared to the bulk. Even at 150 K, when no large-angle dynamics are detected in bulk POE, evidence for chain motions in the nanotube-confined POE is observed. The 2H line shapes representing this motion were modeled by a discrete 3-site jump using a ln-Gaussian distribution of correlation times. An activation energy of 15 ± 1 kJ/mol was determined and the motion envisioned as gauche defects propagating along the primarily trans chains included within CD nanotubes. As the nanotube length decreased, the jump angle became much less defined and more isotropic motions were observed for POE segments at elevated temperatures (>270 K)." @default.
- W2164769685 created "2016-06-24" @default.
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- W2164769685 date "2005-05-19" @default.
- W2164769685 modified "2023-10-17" @default.
- W2164769685 title "Chain Dynamics of Poly(oxyethylene) in Nanotubes ofα-Cyclodextrin by Solid-State2H NMR" @default.
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- W2164769685 doi "https://doi.org/10.1002/macp.200500095" @default.
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