Existence of fcc-packed spherical micelles in diblock copolymer melt

Yen Yu Huang, Jen Yung Hsu, Hsin Lung Chen*, Takeji Hashimoto

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

45 Scopus citations

Abstract

The existence of face centered close (fcc)-packed spherical micelles formed by an asymmetric diblock copolymer in the quiescent melt was investigated. The system under study was a poly(ethylene oxide)-block-poly(1,4-butadiene) (PEO-b-PB) with polydispersity index of 1.05. Temperature-dependent small-angle X-ray scattering (SAXS) experiments show that the bcc phase is transformed into disordered phase when the temperature is raised to 203°C, where the scattering profiles show a broad halo centering. Cooling of copolymer to 201°C, from the disordered micelles (DM) phase, show three diffraction peaks at 0.37, 0.61, and 0.76 nm-1. The large domain spacing in fcc is due to the presence of unimers and oligomeric micelles in the matrix phase. The results also show that the surface-to-volume (S/V) of the domains packed in the fcc lattice is 1.03 times that associated with bcc lattice.

Original languageEnglish
Pages (from-to)406-409
Number of pages4
JournalMacromolecules
Volume40
Issue number3
DOIs
StatePublished - 06 02 2007
Externally publishedYes

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