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• W2048357564 startingPage "12664" @default.
• W2048357564 abstract "Thermosensitive polymer micelles are generally obtained with block copolymers in which one block exhibits a lower critical solution temperature in aqueous solution. We investigate a different design that is based on the use of one block bearing a thermally labile side group, whose hydrolysis upon heating shifts the hydrophilic−hydrophobic balance toward the destabilization of block copolymer micelles. Atom transfer radical polymerization was utilized to synthesize a series of diblock copolymers composed of hydrophilic poly(ethylene oxide) (PEO) and hydrophobic poly(2-tetrahydropyranyl methacrylate) (PTHPMA). We show that micelles of PEO-b-PTHPMA in aqueous solution can be destabilized as a result of the thermosensitive hydrolytic cleavage of tetrahydropyranyl (THP) groups that transforms PTHPMA into hydrophilic poly(methacrylic acid). The three related processes occurring in aqueous solution, namely, hydrolytic cleavage of THP, destabilization of micelles, and release of loaded Nile Red (NR), were investigated simultaneously using 1H NMR, dynamic light scattering, and fluorescence spectroscopy, respectively. At 80 °C, the results suggest that the three events proceed with a similar kinetics. Although slower than at elevated temperatures, the disruption of PEO-b-PTHPMA micelles can take place at the body temperature (∼ 37 °C), and the release kinetics of NR can be adjusted by changing the relative lengths of the two blocks or the pH of the solution." @default.
• W2048357564 created "2016-06-24" @default.
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• W2048357564 date "2008-10-02" @default.
• W2048357564 modified "2023-10-16" @default.
• W2048357564 title "Investigation of a New Thermosensitive Block Copolymer Micelle: Hydrolysis, Disruption, and Release" @default.
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• W2048357564 doi "https://doi.org/10.1021/la802522b" @default.
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