Halogen-bonded mesogens direct polymer self-assemblies up to millimetre length scale

Nikolay Houbenov (), Roberto Milani, Mikko Poutanen, Johannes Haataja, Valentina Dichiarante, Jani Sainio, Janne Ruokolainen, Giuseppe Resnati, Pierangelo Metrangolo () and Olli Ikkala ()
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Nikolay Houbenov: Aalto University (formerly Helsinki University of Technology)
Roberto Milani: Process Chemistry and Environmental Engineering, VTT Technical Research Centre of Finland
Mikko Poutanen: Aalto University (formerly Helsinki University of Technology)
Johannes Haataja: Aalto University (formerly Helsinki University of Technology)
Valentina Dichiarante: Laboratory of Nanostructured Fluorinated Materials (NFMLab), Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano
Jani Sainio: Aalto University (formerly Helsinki University of Technology)
Janne Ruokolainen: Aalto University (formerly Helsinki University of Technology)
Giuseppe Resnati: Laboratory of Nanostructured Fluorinated Materials (NFMLab), Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano
Pierangelo Metrangolo: Process Chemistry and Environmental Engineering, VTT Technical Research Centre of Finland
Olli Ikkala: Aalto University (formerly Helsinki University of Technology)

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Aligning polymeric nanostructures up to macroscale in facile ways remains a challenge in materials science and technology. Here we show polymeric self-assemblies where nanoscale organization guides the macroscopic alignment up to millimetre scale. The concept is shown by halogen bonding mesogenic 1-iodoperfluoroalkanes to a star-shaped ethyleneglycol-based polymer, having chloride end-groups. The mesogens segregate and stack parallel into aligned domains. This leads to layers at ~10 nm periodicity. Combination of directionality of halogen bonding, mesogen parallel stacking and minimization of interfacial curvature translates into an overall alignment in bulk and films up to millimetre scale. Upon heating, novel supramolecular halogen-bonded polymeric liquid crystallinity is also shown. As many polymers present sites capable of receiving halogen bonding, we suggest generic potential of this strategy for aligning polymer self-assemblies.

Date: 2014
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DOI: 10.1038/ncomms5043

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