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Preparation of filled temperature‐sensitive poly( N ‐isopropylacrylamide) gel beads
Author(s) -
Kuckling Dirk,
Schmidt Thomas,
Filipcsei Genovéva,
Adler HansJürgen P.,
Arndt KarlFriedrich
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450641
Subject(s) - poly(n isopropylacrylamide) , materials science , monomer , polymerization , polymer chemistry , chemical engineering , phase (matter) , composite material , copolymer , polymer , chemistry , organic chemistry , engineering
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, BaTiO 3 , TiO 2 , and Ni,) were studied. The phase transition temperature (T pt ) was only weakly influenced by the MCR and the filling material remaining at around 34°C.