[Nat Chem] Highly ordered alignment of a vinyl polymer by host-guest cross-polymerization

25 Feb 2013

[Nature Chemistry, 2013] Chain alignment can significantly influence the macroscopic properties of a polymeric material, but no general and versatile methodology has yet been reported to obtain highly ordered crystalline packing of polymer chains, with high stability. Here, Susumu Kitagawa, Takashi Uemura at Kyoto University, and their colleagues disclose a strategy that relies on 'ordered crosslinks' to produce polymeric materials that exhibit a crystalline arrangement. Divinyl crosslinkers (2,5-divinyl-terephthalate) were first embedded, as substitutional ligands, into the structure of a porous coordination polymer (PCP), [Cu(terephthalate)triethylenediamine0.5]n. A representative vinyl monomer, styrene, was subsequently polymerized inside the channels of the host PCP. The polystyrene chains that form within the PCP channels also crosslink with the divinyl species. This bridges together the polymer chains of adjacent channels and ensures that, on selective removal of the PCP, the polymer chains remain aligned. Indeed, the resulting material exhibits long-range order and is stable to thermal and solvent treatments, as demonstrated by X-ray powder diffraction and transmission electron microscopy.[Read more]

These findings have received nationwide media coverage in Japan.

Publication information

  1. Department of Materials Science, University of Milano - Bicocca, Via R. Cozzi 53, 20125 Milan, Italy.
  2. Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
  3. Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University,
    Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.

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