The molecular dynamics of polyrotaxane consisting of poly (ethylene glycol) and a-cyclodextrins, hydroxypropylated polyrotaxane with a-cyclodextrins partially modified by hydroxylpropyl groups with different modification ratios are investigated by two-dimensional 1H-13C wide-line separation (WISE) NMR, 13C spin-lattice relaxation time in the rotating frame (T1?c) measurement, and center band-only detection of exchange (CODEX) NMR. The chemical modification on pendant hydroxyl groups significantly suppresses hydrogen bonding interactions between cyclodextrin molecules and lead to unique cyclodextrins molecular dynamics and viscoelastic properties.

Chemical modification effects on molecular dynamics of complex poly(rotaxane) investigated by solid-state NMR

245th National Meeting (2013)

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