Highly ordered nanoporous thin films by blending of PSt-b-PMMA block copolymers and PEO additives as structure directing agents

Sung Chan Park, Hyun Jung, Ken Ichi Fukukawa, Luis M. Campos, Kyunghee Lee, Kyusoon Shin, Craig J. Hawker, Jeong Sook Ha, Joona Bang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Herein, we present a simple method for producing nanoporous templates with a high degree of lateral ordering by self-assembly of block copolymers. A key feature of this approach is control of the orientation of polymeric microdomains through the use of hydrophilic additives as structure directing agents. Incorporation of hydrophilic poly(ethylene oxide) (PEO) moieties into poly(styrene-6-methyl methacrylate) (PSt-b-PMMA) diblock copolymers gives vertical alignment of PMMA cylinders on the substrate after solvent annealing. Because of the miscibility between PEO and PMMA, PEO additives were selectively positioned within PMMA microdomains and by controlling the processing conditions, it was found that ordering of PSt-b-PMMA diblock copolymers could be achieved. The perpendicular orientation of PMMA cylinders was achieved by increasing the molecular size of the PEO additives leading to an increased hydrophilicity of the PMMA domains and consequently to control the orientation of microdomains in PSt-b-PMMA block copolymer thin films.

Original languageEnglish
Pages (from-to)8041-8048
Number of pages8
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume46
Issue number24
DOIs
Publication statusPublished - 2008 Dec 15

Keywords

  • Additives
  • Block copolymers
  • Star polymers
  • Thin films

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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