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- W2087612912 abstract "The sol−gel transition and thermosensitivity of methylated polyrotaxane (Me−PR) aqueous solutions were investigated by means of small-angle neutron scattering (SANS) and dynamic light scattering (DLS). It is known that water-solubility of polyrotaxane (PR), consisting of poly(ethylene glycol) (PEG) and α-cyclodextrin (α-CD), is very low due to stacking of neighboring α-CD molecules on a PEG chain. Methylation of the hydroxyl groups on α-CD molecules resulted in a significant improvement of water-solubility, and Me−PR exhibited a thermoreversible sol−gel transition in water depending on the degree of methylation. For low degrees of methylation (≤30%), a Me−PR solution was transparent even up to 80 °C. On the other hand, for high degrees of methylation (≥60%), it became opaque with increasing temperature and a gelation took place at high temperature. The temperature dependence of the sliding motion of α-CD molecules along the PEG chains and the mechanism of sol−gel transition are discussed on the basis of SANS and DLS results." @default.
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- W2087612912 date "2006-12-01" @default.
- W2087612912 modified "2023-10-01" @default.
- W2087612912 title "Sol−Gel Transition of Hydrophobically Modified Polyrotaxane" @default.
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- W2087612912 doi "https://doi.org/10.1021/ma062203z" @default.
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