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Nanoporous Polymer Films from Immiscible Polymer Blends: Pore Size and Composition Dependence

Published online by Cambridge University Press:  01 February 2011

Tong Liu,
Rahmi Ozisik and
Richard W. Siegel
Tong Liu
Affiliation:
Department of Materials Science and Engineering, and Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, Troy, NY 12180.
Rahmi Ozisik
Affiliation:
Department of Materials Science and Engineering, and Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, Troy, NY 12180.
Richard W. Siegel
Affiliation:
Department of Materials Science and Engineering, and Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, Troy, NY 12180.
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Abstract

Nanoporous polymer films have been prepared using immiscible blends of polyetherimide (PEI) and poly(caprolactone diol) (PCLD). The films were prepared by spin-coating from a common solvent — dichloromethane (DCM). To create the nanoporous films, PCLD was removed by immersing the films in acetone, which dissolves PCLD only. Field emission scanning electron microscopy was used to study the porous structure. The pore structure of the films was affected by many factors such as composition of the blend, molecular weight, and various processing parameters. The formation of nanometer size pores was mainly due to the fast phase separation process during spin-coating. The pore size and pore size distribution was found to depend on the blend composition.

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