Diffusion and flow across nanoporous polydicyclopentadiene-based membranes

William A. Phillip, Mark Amendt, Brandon ONeill, Liang Chen, Marc A. Hillmyer, Edward L. Cussler

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

We report gas and liquid transport measurements through membranes that have 40% voids made of 14 nm pores. A reactive polylactide- polynorbornenylethylstyrene block polymer is used as a structural template in the polymerization of dicyclopentadiene during the membrane formation process. After the membrane is cast, the pore structure is formed by etching the polylactide component using dilute aqueous base. The pore structure is isotropic; therefore, there is no need for special alignment techniques. Knudsen diffusion experiments and water flow experiments show pores with a tortuosity of 1.81 and a size of 14 nm, a diameter consistent with nitrogen adsorption and small-angle X-ray scattering measurements. These membranes are effective for ultrafiltration, with molecular weight cutoffs (MWCO) consistent with theoretical predictions with no adjustable parameters. These MWCOs can be tuned by changing the size of the constituent blocks in the templating copolymer.

Original languageEnglish (US)
Pages (from-to)472-480
Number of pages9
JournalACS Applied Materials and Interfaces
Volume1
Issue number2
DOIs
StatePublished - Feb 25 2009

Keywords

  • Knudsen diffusion
  • block copolymers
  • filtration
  • nanoporous membranes

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