Journal
MACROMOLECULES
Volume 42, Issue 22, Pages 8835-8843Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma9018944
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Funding
- Argonne National Laboratories
- UW-NSF Nanoscale Science and Engineering Center [DMR-0425880]
- NSF-DMR CAREER [0449688]
- MEST
- POSCO
- Postech Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [832760, 0449688] Funding Source: National Science Foundation
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Two kinds of polyhedral oligomeric silsesquioxane (POSS)-containing block copolymers (BCPs), namely PS-b-PMAPOSS and PMMA-b-PMAPOSS, were synthesized by living anionic polymerization. A wide range of molecular weights were obtained with a very narrow polydispersity index of less than 1.09. The bulk samples prepared by slow evaporation from a polymer solution in chloroform exhibit well-defined microphase-separated structures with long-range order. Thermal annealing induced hierarchical structures consisting of a smaller length scale ordered crystalline POSS domains within the larger microphase-separated structures. We report detailed structural characterization of these hierarchical structures in bulk and thin films by transmission electron microscopy and grazing incidence wide-angle X-ray scattering (GIWAXS). On the basis of this structural analysis, we propose a model for the formation of an orthorhombic lattice structure through the aggregation of POSS segments which formed a helix-like structure.
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