The influence of PEG macromonomers on the size and properties of thermosensitive aqueous microgels |
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Authors: | Andrij Pich Sebastian Berger Olga Ornatsky Vladimir Baranov Mitchell A Winnik |
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Institution: | 1. Department of Macromolecular Chemistry, Technische Universit?t Dresden, 01069, Dresden, Germany 2. Department of Chemistry, University of Toronto, M5S 3H6, Toronto, Canada
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Abstract: | We describe the preparation and thermal response of aqueous microgels based on poly(N-vinyl caprolactam) containing grafted poly(ethylene glycol) (PEG) chains. These microgels were synthesized by free radical
copolymerization of vinyl caprolactam and acetoacetoxyethyl methacrylate in the presence of methoxy-capped poly(ethylene glycol)methacrylate
macromonomers. We show that variation of the amount of PEG macromonomer or the length of the PEG chain provides effective
control of the microgel diameter in the range 60–220 nm. The presence of the grafted PEG chains improves the colloidal stability
of the microgels. The incorporation of the PEG macromonomers into microgel structure decreases the swelling degree and induces
a shift of the volume phase transition to higher temperatures.
This paper is dedicated to Professor Haruma Kawaguchi in honor of his many contributions to the field of polymer particle
synthesis and applications. |
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Keywords: | Microgel PEG macromonomer Temperature sensitive |
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