Alignment of Cylindrical Microdomains on a Grating Substrate by Binary Blends of Polystyrene-Poly(methyl methacrylate)

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  • Chen Feng
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Asaka Satoshi
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Inoue Tomohiro
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Takenaka Mikihito
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Hasegawa Hirokazu
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Yoshida Hiroshi
    Materials Research Laboratory, Hitachi Ltd.

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We have investigated the effect of blending on the orientation of cylindrical domains in binary mixture of asymmetric polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) block copolymers. Thin films of PMMA-cylinder-forming block copolymer were prepared on flat substrate with silicon oxide surface. Atomic force microscope observation reveals that the PMMA cylinders orient perpendicular to the substrate by tuning the film thickness. Further, the grating substrate was used to guide the alignment of the perpendicular cylinders. As a result, an array of highly ordered, hexagonally-packed PMMA cylinders in PS matrix with domain spacing of less than 30nm has been produced.

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