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Method of making a cellulose acetate low density microcellular foam

Patent ·
OSTI ID:6170002
Los-density microcellular foam having a cell size of not greater than 2 ..mu..m and a method is described for making by dissolving cellulose acetate in an acetone-based solvent, gelling the solution in a water bath maintained at 0 to 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 cell size of about 0.3 to 2 ..mu..m. The small cell size foam is particularly adaptable for encapsulation laser targets.
Assignee:
Department of Energy
Patent Number(s):
US 4118449
OSTI ID:
6170002
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
ACETATES
ACETONE
CARBOHYDRATES
CARBOXYLIC ACID SALTS
CELLULOSE
COLLOIDS
DIFFUSION
DISPERSIONS
FOAMS
GELS
IMPURITIES
KETONES
LASERS
ORGANIC COMPOUNDS
POLYSACCHARIDES
PRODUCTION
SACCHARIDES
SOLVENTS
TARGETS