Solvent-driven evolution of block copolymer morphology under 3D confinement

Le Li, Kazuyuki Matsunaga, Jintao Zhu, Takeshi Higuchi, Hiroshi Yabu, Masatsugu Shimomura, Hiroshi Jinnai, Ryan C. Hayward, Thomas P. Russell

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)


Nanoparticles with concentric layered structures were generated from a lamellae-forming poly(styrene-b-isoprene) diblock copolymer using controlled precipitation from a tetrahydrofuran/water mixture. Chloroform, a good solvent for both blocks, was used to swell and anneal the nanoparticles suspended in aqueous media. The three-dimensional morphologies of particles were reconstructed by transmission electron microtomography throughout the process of solvent annealing. A transition from concentric lamellae to PI cylinders in a PS matrix occurred upon annealing, presumably due to a slight selectivity of chloroform for PS. These cylindrical microdomains were further divided into PS-core-PI-shell spherical structures in a PS matrix upon extended annealing, a structure that is unique among reported microphase separated morphologies of diblock copolymers.

Original languageEnglish
Pages (from-to)7807-7812
Number of pages6
Issue number18
Publication statusPublished - 2010 Sept 28


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