Nanoporous thin films based on polylactide-grafted norbornene copolymers

  • Oh S
  • Lee J
  • Theato P
 et al. 
  • 21

    Readers

    Mendeley users who have this article in their library.
  • 27

    Citations

    Citations of this article.

Abstract

Thermally stable vinyl polymerized polynorbornene (PNB) is one of the challenging materials in porous low dielectric films for packaging applications. Nanoporous PNB thin films were obtained with poly(D,L-lactide) (PLA)-grafted norbornene copolymers. Thermally labile PLA chains act as pore generators in PNB films. Thermally stable PNB main chains were synthesized by Pd-catalyzed vinyl polymerization and PLA side chains were rafted onto the PNB main chains by ring opening polymerization. The brittle and poor processible properties of PNB could easily be controlled by the copolymerization with norbornene derivatives. In thin films, the PLA chains were found to thermally decompose at about 250 degrees C while the PNB matrix was stable during this pore generating process. The porosity of the porous PNB thin films could be controlled up to 18% with pore sizes below 5 nm range by varying the chain length of grafted PLA. Introduction of cross-linking epoxy groups onto the PNB main chains resulted in the formation of well-defined nanopores without any extensive pore collapse during the vitrification of the PNB matrix. Additionally, it is demonstrated that the photopatterning of the thin films could be achieved using photoinitiator.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

  • Patrick TheatoInstitute for Technical and Macromolecular Chemistry, University of Hamburg

    Follow
  • Sewon Oh

  • Jin Kyu Lee

  • Kookheon Char

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free