Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Fabrication of Silicon Oxycarbide Foams from Extruded Blends of Polysiloxane, Low-Density Polyethylene (LDPE), and Polymer Microbead

Eom, Jung-Hye;Kim, Young-Wook

  • Published : 20071200
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Abstract

Silicon oxycarbide (SiOC) foams with porosities ranging from 77% to 90% and a cell density higher than 108 cells/cm3 were made from polysiloxane, low-density polyethylene (LDPE), and polymer microbead blends. The polysiloxane, LDPE, and polymer microbeads were compounded directly using a counter-rotated twin-screw extruder. The obtained blends were foamed with gaseous carbon dioxide, cross-linked, and subsequently pyrolyzed. The process resulted in the production of highly porous, open-cell SiOC foams with a bimodal distribution of pore morphology, small spherical pores derived from polymer microbeads and relatively large elongated or equiaxed pores derived from foaming using carbon dioxide and decomposition of LDPE.

Keywords

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