Small‐Angle X‐Ray Scattering Studies of Block Copolymer Nano‐Objects: Formation of Ordered Phases in Concentrated Solution During Polymerization‐Induced Self‐Assembly

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  • Matthew J. Rymaruk
    Dainton Building Department of Chemistry The University of Sheffield Sheffield S3 7HF UK
  • Cate T. O'Brien
    Dainton Building Department of Chemistry The University of Sheffield Sheffield S3 7HF UK
  • Csilla György
    Dainton Building Department of Chemistry The University of Sheffield Sheffield S3 7HF UK
  • Bastien Darmau
    Dainton Building Department of Chemistry The University of Sheffield Sheffield S3 7HF UK
  • James Jennings
    Dainton Building Department of Chemistry The University of Sheffield Sheffield S3 7HF UK
  • Oleksandr O. Mykhaylyk
    Dainton Building Department of Chemistry The University of Sheffield Sheffield S3 7HF UK
  • Steven P. Armes
    Dainton Building Department of Chemistry The University of Sheffield Sheffield S3 7HF UK

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<jats:title>Abstract</jats:title><jats:p>We report that polymerization‐induced self‐assembly (PISA) can be used to prepare lyotropic phases comprising diblock copolymer nano‐objects in non‐polar media. RAFT dispersion polymerization of benzyl methacrylate (BzMA) at 90 °C using a trithiocarbonate‐capped hydrogenated polybutadiene (PhBD) steric stabilizer block in n‐dodecane produces either spheres or worms that exhibit long‐range order at 40 % w/w solids. NMR studies enable calculation of instantaneous copolymer compositions for each phase during the BzMA polymerization. As the PBzMA chains grow longer when targeting PhBD<jats:sub>80</jats:sub>–PBzMA<jats:sub>40</jats:sub>, time‐resolved small‐angle X‐ray scattering reveals intermediate body‐centered cubic (BCC) and hexagonally close‐packed (HCP) sphere phases prior to formation of a final hexagonal cylinder phase (HEX). The HEX phase is lost on serial dilution and the aligned cylinders eventually form disordered flexible worms. The HEX phase undergoes an order–disorder transition on heating to 150 °C and a pure HCP phase forms on cooling to 20 °C.</jats:p>

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