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Effect of the casting solvent on the morphology of polystyrene-b-isoprene) diblock copolymer/magnetic nanoparticle mixtures
Cited 45 time in
Web of Science
Cited 45 time in Scopus
- Authors
- Issue Date
- 2006-02
- Publisher
- American Chemical Society
- Citation
- Langmuir, Vol.22 No.4, pp.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 gamma-Fe(2)O(3) nanoparticles. Notably, for the mixtures of PS-b-PI/gamma-Fe(2)O(3) nanoparticles cast with toluene, which is a neutral solvent for both PS and PI blocks, the latticelike aggregates of gamma-Fe(2)O(3) 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
- Language
- English
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