Phase-separated block copolymers are capable of self-assembling into a variety of interesting morphological structures, the nature of which is determined primarily by the copolymer composition. A number of potential applications for such structures may be envisioned. In this paper, we describe the use of phase-separated structures in a polyimide matrix to produce low dielectric constant, closed-cell polyimide nanofoams by thermal decomposition of a labile polymeric block. The morphology in the cured triblock polyimide copolymer is maintained in the nanofoam produced.
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