Hierarchical self-assembled structures from POSS-containing block copolymers synthesized by living anionic polymerization

Tomoyasu Hirai, Melvina Leolukman, Sangwoo Jin, Raita Goseki, Yoshihito Ishida, Masa Aki Kakimoto, Teruaki Hayakawa, Moonhor Ree, Padma Gopalan

Research output: Contribution to journalArticlepeer-review

138 Citations (Scopus)

Abstract

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 welldefined 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 microphaseseparated 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.

Original languageEnglish
Pages (from-to)8835-8843
Number of pages9
JournalMacromolecules
Volume42
Issue number22
DOIs
Publication statusPublished - Nov 24 2009

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

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