Low-density microcellular foam and method of making same

Patent · Sat Jan 01 00:00:00 EST 1977

OSTI ID:862788

Rinde, James A ^[1]

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1. Livermore, CA

Low-density microcellular foam having a cell size of not greater than 2 .mu.m and method of making by dissolving cellulose acetate in an acetone-based solvent, gelling the solution in a water bath maintained at 0.degree.-10.degree. 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.times.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 applicable for encapsulation of laser targets.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 4012265
• OSTI ID: 862788
• Country of Publication: United States
• Language: English

Related Subjects

low-density
microcellular
foam
method
cell
size
dissolving
cellulose
acetate
acetone-based
solvent
gelling
solution
water
bath
maintained
degree
-10
selected
period
time
allow
impurities
diffuse
freezing
freeze-drying
solvents
sublime
structure
solidifies
density
065
times
10
kg
particularly
applicable
encapsulation
laser
targets
water bath
low-density microcellular
density microcellular
particularly applicable
cell size
cellulose acetate
laser targets
microcellular foam
bath maintained
acetone-based solvent
allow impurities
selected period
size foam
solvents sublime
structure solidifies
laser target
cellular foam
dissolving cellulose
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