Advanced Materials

Cover image for Vol. 26 Issue 26

Editor-in-Chief: Peter Gregory, Deputy Editors: Martin Ottmar, Carolina Novo da Silva, Lorna Stimson

Online ISSN: 1521-4095

Associated Title(s): Advanced Energy Materials, Advanced Engineering Materials, Advanced Functional Materials, Advanced Healthcare Materials, Advanced Materials Interfaces, Advanced Optical Materials, Particle & Particle Systems Characterization, Small

July 19, 2002

Ultralow dielectric constants...

have been achieved for thin porous films of high-Tg polymers. Rapid solid-state polymer expansion applying supercritical carbon dioxide was used to create nanosized cavities in thin films of aromatic polyimides. Foamed films with spherical voids less than 10 nm in size as well as multilayered microstructures with interlayer distances of less than 20 nm were made with k values as low as 1.77. (N. F. A. van der Vegt et al., August 5, Adv. Mater. 2002, 14, 1041-1046)

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