Bicontinuous Microemulsions in Partially Charged Ternary Polymer Blends

Shim, Jimin; Bates, Frank S.; Lodge, Timothy P.

doi:10.1021/acsmacrolett.9b00554

Bicontinuous Microemulsions in Partially Charged Ternary Polymer Blends

Journal Article · Fri Aug 23 04:00:00 EDT 2019 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.9b00554· OSTI ID:1831779

Shim, Jimin ^[1]; ^[2]; ^[2]

Univ. of Minnesota, Minneapolis, MN (United States); University of Minnesota
Univ. of Minnesota, Minneapolis, MN (United States)

We describe the phase behavior of a partially charged ternary polymer blend model system, comprising a compositionally symmetric poly[(oligo(ethylene glycol) methyl ether methacrylate-co-oligo(ethylene glycol) propyl sodium sulfonate methacrylate)]-b-polystyrene (POEGMA23–PS) diblock polymer and the constituent POEGMA23 and PS homopolymers, along the volumetrically symmetric isopleth, where 23 denotes the percentage of charged monomers in the POEGMA chain. Small-angle neutron and X-ray scattering and dynamic mechanical spectroscopy measurements reveal morphological transitions from a layered superlattice to swollen lamellae to a bicontinuous microemulsion (BμE), followed by macroscopic phase separation, with increasing homopolymer content. The BμE channel occurs between 85 and 90% homopolymer addition, positioned approximately at the isotropic Lifshitz composition predicted by mean-field theory for neutral systems. The resulting BμE morphology exhibits a periodicity of 26 nm, yielding a mesoscopically structured but macroscopically disordered bicontinuous structure. That this structure can be achieved in a charged polymer system is surprising, given the huge asymmetries typically induced by adding charge to either diblock copolymers or binary polymer blends.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Minnesota, Twin Cities, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0017809

OSTI ID:: 1831779

Alternate ID(s):: OSTI ID: 1572537

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Journal Issue: 9 Vol. 8; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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