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Microcellular Polymeric Foams (MPFs) Generated Continuously in Supercritical Carbon Dioxide

Published online by Cambridge University Press:  01 February 2011

Srinivas Siripurapu ,
Yvon J. Gay ,
Joseph R. Royer ,
Joseph M. DeSimone ,
Saad A. Khan  and
Richard J. Spontak
Srinivas Siripurapu
Affiliation:
Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27695
Yvon J. Gay
Affiliation:
Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27695
Joseph R. Royer
Affiliation:
Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27695
Joseph M. DeSimone
Affiliation:
Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27695 Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599
Saad A. Khan
Affiliation:
Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27695
Richard J. Spontak
Affiliation:
Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27695
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Abstract

Microcellular polymeric foams (MPFs) hold tremendous promise for engineering applications as substitutes to their solid analogs in light of reduced manufacturing/materials costs and improved properties. We present a two-part study addressing the generation of such materials in the presence of supercritical carbon dioxide (scCO2). The first part describes the production of polystyrene MPFs in a continuous extrusion process, as well as the effect of operating conditions such as temperature and CO2 concentration on foam morphology. The second part discusses microcellular foaming of poly (vinylidene fluoride) (PVDF), a semicrystalline polymer, via blending with the amorphous polymer poly (methyl methacrylate) PMMA. Foams of pure PVDF possess ill-defined morphologies, whereas those of PVDF-PMMA blends show an improvement with cell sizes on the order of 10 mm or less and cell densities in excess of 109 cells/cm3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 629: Symposium FF – Interfaces, Adhesion and Processing in Polymer Systems , 2000 , FF9.9
Copyright
Copyright © Materials Research Society 2000

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References

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