Tuning the Properties of Photonic Films from Polymer Beads by Chemistry

摘要: This paper describes the preparation of monodisperse colloids from various methacrylates. These sediment well on glass slides and formin dried statelarge three-dimensional face-centered cubic photonic crystal films with Bragg reflection in visible region. Depending crystallization conditions, domain sizes vary between 50 300 μm. By cross-linking polymer within colloids, it is possible to increase thermal stability polymeric structure tremendously (up 1 h at 200 °C). structures soften above Tg (rubbery structure), but they cannot fuse. Cross-linked poly(tert-butyl methacrylate) can either thermally or chemically be modified. During treatment (above °C) shrink, as isobutene split off. allows a change lattice constant color an already crystallized dry film. The acid-catalyzed cleavage ester bond conversion existing photoni...