Preparation of microcellular SAN foam using supercritical CO2

Kyung Nam Lee, Yong Joon Suh, Hae Joon Lee, Jung-Hyun Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Microcellular polymeric foam structures have been generated using a pressure induced phase separation in concentrated mixtures of supercritical CO2 and SAN. The process typically generates microcellular core structure encased by nonporous skin. Pore growth will occur through two mechanisms : diffusion of CO2 from polymer-rich regions into the pores and also through CO2 gas expansion. The effects of saturation pressure, temperature, and swelling time on the cell size, cell density, and bulk density of the porous materials have been studied. Higher CO2 pressure lowered polymer viscosity and interfacial tension between SAN and CO2 to produce cells with smaller average size but higher cell density, resulted from increase in swollen CO2 into SAN matrix. This trend was similar to what was observed in swelling time series. While the average cell size increased with increasing temperature, the cell density decreased. The trend of bulk density was similar to that of cell size.

Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalPolymer (Korea)
Volume23
Issue number2
Publication statusPublished - 1999 Dec 1

Fingerprint

Foams
Swelling
Polymers
Phase separation
Surface tension
Porous materials
Time series
Skin
Gases
Viscosity
Temperature

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Lee, K. N., Suh, Y. J., Lee, H. J., & Kim, J-H. (1999). Preparation of microcellular SAN foam using supercritical CO2. Polymer (Korea), 23(2), 181-188.
Lee, Kyung Nam ; Suh, Yong Joon ; Lee, Hae Joon ; Kim, Jung-Hyun. / Preparation of microcellular SAN foam using supercritical CO2. In: Polymer (Korea). 1999 ; Vol. 23, No. 2. pp. 181-188.
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Lee, KN, Suh, YJ, Lee, HJ & Kim, J-H 1999, 'Preparation of microcellular SAN foam using supercritical CO2', Polymer (Korea), vol. 23, no. 2, pp. 181-188.

Preparation of microcellular SAN foam using supercritical CO2. / Lee, Kyung Nam; Suh, Yong Joon; Lee, Hae Joon; Kim, Jung-Hyun.

In: Polymer (Korea), Vol. 23, No. 2, 01.12.1999, p. 181-188.

Research output: Contribution to journalArticle

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AU - Lee, Kyung Nam

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AU - Lee, Hae Joon

AU - Kim, Jung-Hyun

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AB - Microcellular polymeric foam structures have been generated using a pressure induced phase separation in concentrated mixtures of supercritical CO2 and SAN. The process typically generates microcellular core structure encased by nonporous skin. Pore growth will occur through two mechanisms : diffusion of CO2 from polymer-rich regions into the pores and also through CO2 gas expansion. The effects of saturation pressure, temperature, and swelling time on the cell size, cell density, and bulk density of the porous materials have been studied. Higher CO2 pressure lowered polymer viscosity and interfacial tension between SAN and CO2 to produce cells with smaller average size but higher cell density, resulted from increase in swollen CO2 into SAN matrix. This trend was similar to what was observed in swelling time series. While the average cell size increased with increasing temperature, the cell density decreased. The trend of bulk density was similar to that of cell size.

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