Method of making a cellulose acetate low density microcellular foam

Patent · Tue Oct 03 00:00:00 EDT 1978

OSTI ID:6170002

Rinde, J A

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
• Resource Relation: Patent File Date: Filed date 9 Dec 1976; Other Information: PAT-APPL-749,205
• Country of Publication: United States
• Language: English

Related Subjects

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