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Effect of the Casting Solvent on the Morphology of Poly(styrene-b-isoprene) Diblock Copolymer/Magnetic Nanoparticle Mixtures

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Authors
Park, Moon Jeong; Char, Kookheon
Issue Date
2006-01-13
Publisher
American Chemical Society
Citation
Langmuir, 2006, 22, 1375-1378
Abstract
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 γ-Fe2O3 nanoparticles. Notably, for the mixtures of PS-b-PI/γ-Fe2O3 nanoparticles cast with toluene, which is a neutral solvent for both PS and PI blocks, the latticelike aggregates of γ-Fe2O3 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.
ISSN
0743-7463 (print)
1520-5827 (online)
Language
English
URI
http://hdl.handle.net/10371/5755
DOI
https://doi.org/10.1021/la052218a
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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