| Abstract: | The use of polymeric materials with temperature‐dependent degrees of swelling (especially polymers that exhibit lower critical solution temperature (LCST) behaviour in aqueous solutions) in microsystems requires the preparation and patterning of layers in the µm range. Copolymers based on N‐isopropylacrylamide were modi‐fied with a stilbazolium salt chromophore to yield photocrosslinkable temperature‐sensitive polymers. The chromophore and the polymers were characterized by UV, IR, 1H‐NMR (nuclear magnetic resonance) and 13C‐NMR spectra. The resulting polymers showed LCST behaviour, which was measured by differential scanning calorimetry. The photocrosslinking properties were studied by UV irradiation of the thin films and measurement of the changes in the UV absorption spectra. By irradiation of thin films through a mask it was possible to obtain patterned networks in the µm range (20 µm space width and ≥50 µm line width). The resulting patterned networks showed temperature‐dependent swelling properties in aqueous media. Copyright © 1999 John Wiley & Sons, Ltd. |
