Preparation of filled temperature-sensitive poly(N-isopropylacrylamide) gel beads |
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| Authors: | Dirk Kuckling Thomas Schmidt Genovéva Filipcsei Hans-Jürgen P Adler Karl-Friedrich Arndt |
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| Institution: | 1. Institut für Makromolekulare Chemie und Textilchemie, Technische Universität Dresden, D-01062 Dresden, Germany;2. Institut für Physikalische Chemie und Elektrochemie, Technische Universität Dresden, D-01062 Dresden, Germany;3. Department of Physical Chemistry, Budapest University of Technology and Economics, H-1521 Budapest, Hungary |
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| Abstract: | Temperature-sensitive filled poly(N-isopropylacrylamide) (PNIPAAm) gel beads with diameters in the range of millimeters were prepared using the alginate technique. The polymerization and cross-linking reaction of NIPAAm in the presence of inorganic filling particles was performed in spherical networks of Ca-alginate forming interpenetrating networks (IPN). Thermo-sensitive gel beads could be obtained by washing these IPN with EDTA solution. The PNIPAAm gel beads were analyzed by optical methods to observe there swollen diameter in dependence on the temperature. The diameters of the swollen gel beads were in the range of 0.1 - 2 mm. The influence of the monomer to cross-linker ratio (MCR) and the filling materials (ferrofluid, BaTiO3, TiO2, and Ni,) were studied. The phase transition temperature (Tpt) was only weakly influenced by the MCR and the filling material remaining at around 34°C. |
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| Keywords: | alginate technique ferrofluid filler gel beads PNIPAAm hydrogels temperature-sensitive polymers |
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