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Effect of the casting solvent on the morphology of polystyrene-b-isoprene) diblock copolymer/magnetic nanoparticle mixtures

  • Park, MJ
  • Char, K
  • Park, Jongnam
  • Hyeon, T
Publication Date
Feb 01, 2006
[email protected]
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We investigate the effect of the casting solvent on the phase behavior of a cylinder-forming poly (styrene-b-isoprene) (PS-b-PI) diblock copolymer mixed with marginally selective ??-Fe2U3 nanoparticles. Notably, for the mixtures of PS-b-PI/??-Fe2O3 nanoparticles cast with toluene, which is a neutral solvent for both PS and PI blocks, the latticelike aggregates of ??-F2O3 nanoparticles, originating from magnetic dipole interactions, induce an intriguing transition from hexagonal cylinders to body-centered cubic spheres via undulated cylinders whereas the neat block copolymer does not show such an order-order transition. In contrast, when PI-selective hexane is used, the nanoparticles are selectively incorporated into the PI domains, and the microphase-separated hexagonal cylinder morphology gradually loses its long-range order upon increasing the nanoparticle concentration. The structural information obtained from small-angle X-ray scattering is also in good agreement with transmission electron microscopy images and differential scanning calorimetry results. / close / 30 / 31

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