Low-density microcellular foam and method of making same. [cellulose acetate, less than 2. mu. m cell size]
Patent
·
OSTI ID:7255040
Low-density microcellular foam having a cell size of not greater than 2 ..mu..m and method of making it are described. The method consists of dissolving cellulose acetate in an acetone-based solvent, gelling the solution in a water bath maintained at 0/sup 0/--10/sup 0/C for a selected period of time to allow impurities to diffuse out, freezing the gel, and then freeze-drying, wherein water and solvents sublime and the gel structure solidifies into low-density microcellular foam. The foam has a density of 0.065 to 0.6 x 10/sup 3/ kg/m/sup 3/ and a cell size of about 0.3 to 2 ..mu..m. The small cell size foam is particularly applicable for encapsulation of laser targets. 3 tables.
- Assignee:
- Energy Research and Development Administration
- Patent Number(s):
- US 4012265
- OSTI ID:
- 7255040
- Resource Relation:
- Patent File Date: Filed date 2 Sep 1975; Other Information: PAT-APPL-609,641
- Country of Publication:
- United States
- Language:
- English
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