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Discovery of a Frank-Kasper [sigma] phase in sphere-forming block copolymer melts.(REPORTS)(Author abstract)(Report)

Lee, Sangwoo ; Bluemle, Michael. J. ; Bates, Frank S.

Science, Oct 15, 2010, Vol.330(6002), p.349(5) [Tạp chí có phản biện]

ISSN: 0036-8075

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  • Nhan đề:
    Discovery of a Frank-Kasper [sigma] phase in sphere-forming block copolymer melts.(REPORTS)(Author abstract)(Report)
  • Tác giả: Lee, Sangwoo ; Bluemle, Michael. J. ; Bates, Frank S.
  • Chủ đề: Block Copolymers -- Properties
  • Là 1 phần của: Science, Oct 15, 2010, Vol.330(6002), p.349(5)
  • Mô tả: Sphere-forming block copolymers are known to self-assemble into body-centered cubic crystals near the order-disorder transition temperature. Small-angle x-ray scattering and transmission electron microscopy experiments on diblock and tetrablock copolymer melts have revealed an equilibrium phase characterized by a large tetragonal unit cell containing 30 microphase-separated spheres. This structure, referred to as the sigma ([sigma]) phase by Frank and Kasper more than 50 years ago, nucleates and grows from the body-centered cubic phase similar to its occurrence in metal alloys and is a crystal approximant to dodecagonal quasicrystals. Formation of the [sigma] phase in undiluted linear block copolymers (and certain branched dendrimers) appears to be mediated by macromolecular packing frustration, an entropic contribution to the interparticle interactions that control the sphere-packing geometry. 10.1126/science.1195552
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0036-8075

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