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Title: Method of making a cellulose acetate low density microcellular foam

Abstract

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 0-10.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 adaptable for encapsulation of laser targets.

Inventors:
 [1]
  1. Livermore, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
863201
Patent Number(s):
US 4118449
Assignee:
United States of America as presprented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; cellulose; acetate; density; microcellular; foam; low-density; cell; size; dissolving; acetone-based; solvent; gelling; solution; water; bath; maintained; 0-10; degree; selected; period; time; allow; impurities; diffuse; freezing; freeze-drying; solvents; sublime; structure; solidifies; 065; times; 10; kg; particularly; adaptable; encapsulation; laser; targets; water bath; low-density microcellular; particularly adaptable; density microcellular; 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; /264/106/

Citation Formats

Rinde, James A. Method of making a cellulose acetate low density microcellular foam. United States: N. p., 1978. Web.
Rinde, James A. Method of making a cellulose acetate low density microcellular foam. United States.
Rinde, James A. 1978. "Method of making a cellulose acetate low density microcellular foam". United States. https://www.osti.gov/servlets/purl/863201.
@article{osti_863201,
title = {Method of making a cellulose acetate low density microcellular foam},
author = {Rinde, James A},
abstractNote = {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 0-10.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 adaptable for encapsulation of laser targets.},
doi = {},
url = {https://www.osti.gov/biblio/863201}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}