A new strategy to prepare temperature-sensitive poly(<Emphasis Type="Italic">N</Emphasis>-isopropylacrylamide) microgels |
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Authors: | Jian-Tao Zhang Xiang-Li Liu Alfred Fahr Klaus D Jandt |
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Institution: | 1.Institute of Materials Science and Technology (IMT),Friedrich-Schiller-University Jena,Jena,Germany;2.Department of Pharmaceutical Technology,Friedrich-Schiller-University Jena,Jena,Germany |
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Abstract: | In this study, a new method was developed to prepare temperature-sensitive poly(N-isopropylacrylamide) microgels by free radical precipitation polymerization using siloxane coupling agent as the new crosslinker.
Ammonium persulfate acted as the initiator for the radical copolymerization as well as the catalyst for the hydrolysis/condensation
of the siloxane groups. The particle diameter and polydispersity of the microgels were measured by photon correlation spectroscopy
and the results display that the microgels are monodisperse. The microgels exhibit temperature sensitivity and the phase transition
temperature is approximately 31 °C. Furthermore, the diameter of the microgels changes upon heating and cooling processes.
These were observed to be reversible. The novel crosslinking method described herein is the condensation of siloxane groups,
which is totally different from the traditional double-vinyl crosslinkers. This innovative approach offers an alternative
path to prepare functional core–shell particles and inorganic/organic hybrid materials. |
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Keywords: | Microgel Temperature sensitive Poly(N-isopropylacrylamide) Siloxane coupling agent |
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