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- W2052149500 abstract "Thermoresponsive hydrogel nanoparticles were prepared by self-assembly of two different hydrophobically modified polymers, namely a cholesterol-bearing pullulan (CHP) and a copolymer of N-isopropylacrylamide (NIPAM) and N-[4-(1-pyrenyl)butyl]-N-n-octadecylacrylamide] (PNIPAM-C18Py). The interactions between CHP and PNIPAM-C18Py were investigated by fluorescence spectroscopy, dynamic light scattering, and size exclusion chromatography. After ultrasonication of a mixture of CHP and PNIPAM-C18Py (5:1 by weight) at 25 °C, monodisperse nanoparticles (Dh = 45 nm) were obtained, consisting of self-assembly of the two polymers associated via their hydrophobic moieties. Evidence from fluorescence and dynamic light scattering demonstrated that, above 32 °C, the lower critical solution temperature (LCST) of PNIPAM-C18Py, the colloidal mixed nanoparticles increase in diameter (from 47 to 160 nm), but no macroscopic aggregation could be detected. This phenomenon was thermoreversible: upon cooling the particles recovered their original diameter." @default.
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- W2052149500 date "2000-04-06" @default.
- W2052149500 modified "2023-10-10" @default.
- W2052149500 title "Controlled Association of Amphiphilic Polymers in Water: Thermosensitive Nanoparticles Formed by Self-Assembly of Hydrophobically Modified Pullulans and Poly(<i>N</i>-isopropylacrylamides)" @default.
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- W2052149500 doi "https://doi.org/10.1021/ma991798d" @default.
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