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Fabrication of porous film based on poly(2,6-dimetyl-1,4-phenylene ether) block copolymer by supercritical carbon dioxide treatment

Authors
Journal
Reactive and Functional Polymers
1381-5148
Publisher
Elsevier
Publication Date
Volume
71
Issue
9
Identifiers
DOI: 10.1016/j.reactfunctpolym.2011.06.009
Keywords
  • Poly(2
  • 6-Dimethyl-1
  • 4-Phenylene Ether)
  • Polydimethylsiloxane
  • Block Copolymer
  • Supercritical Carbon Dioxide
  • Porous Material

Abstract

Abstract The block copolymer poly(2,6-dimethyl-1,4-phenylene ether)- b-polydimethylsiloxane (PPE- b-PDMS) was prepared via hydrosilylation between poly(2,6-dimethyl-1,4-phenylene ether) (PPE) and polydimethylsiloxane (PDMS) homopolymers. The formation of block copolymer was confirmed by 1H NMR and DSC analyses. The block copolymer films were treated by supercritical carbon dioxide (scCO 2) at moderate temperatures under high pressure of 25 MPa for 2 h followed by depressurization. The resulting films showed the microcellular structure by the formation of dense isolated pores, whereas few pores were observed in PPE homopolymer film after the same foaming process. The size of the pores was able to be controlled by varying the processing temperature or the depressurization rate.

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