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Low‐Temperature, Surface‐Mediated Foaming of Polymer Films

2004; Volume: 16; Issue: 12 Linguagem: Inglês

10.1002/adma.200306068

1521-4095

Sarada Siripurapu, Joseph M. DeSimone, Saad A. Khan, Richard J. Spontak,

Phase Equilibria and Thermodynamics

Ultraporous thin polymer films (see Figure) are generated using physical constraints imposed by external surfaces (hard plates) and internal surfaces (hard nanoparticles and soft micelles) via foaming with supercritical CO 2 . The constraints serve as diffusion barriers and/or heterogeneous nucleation sites. Use of CO 2 ‐philic copolymers further enables microcellular foaming at reduced pressures with liquid CO 2 .