Microdomain orientation of PS-b-PMMA by controlled interfacial interactions

Sujin Ham, Changhak Shin, Eunhye Kim, Du Yeol Ryu, Unyong Jeong, Thomas P. Russell, Craig J. Hawker

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Abstract

The microdomain orientation in thin films of cylinder- and lamella-forming diblock copolymers, polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA), was investigated as a function of the film thickness and the composition of random copolymers composed of styrene (S) and methyl methacrylate (MMA), denoted as P(S-r-MMA), that were anchored to the substrate. Using scanning force microscopy (SFM) and grazing incidence small-angle X-ray scattering (GIS AXS), the dependence of the microdomain orientation on film thickness around lattice period (or d-spacing, L0), where the microdomain orientations normal to the film surface could be achieved, showed that the optimal condition for the balanced interfacial interactions (the so-called neutrality in random copolymer) was 0.64 of PS mole fraction (XPS) for the cylindrical microdomain having narrow compositional range of P(S-r-MMA) from 0.52 to 0.72 of XPS, whereas for the lamella microdomain it was observed at X PS = 0.55 ranging extensively from 0.48 to 0.78.

Original languageEnglish
Pages (from-to)6431-6437
Number of pages7
JournalMacromolecules
Volume41
Issue number17
DOIs
Publication statusPublished - 2008 Sep 9

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Ham, S., Shin, C., Kim, E., Ryu, D. Y., Jeong, U., Russell, T. P., & Hawker, C. J. (2008). Microdomain orientation of PS-b-PMMA by controlled interfacial interactions. Macromolecules, 41(17), 6431-6437. https://doi.org/10.1021/ma8007338