Bicontinuous Microemulsions in Partially Charged Ternary Polymer Blends
- Bicontinuous Microemulsions in Partially Charged Ternary Polymer Blends
- 심지민; Frank S. Bates; Timothy P. Lodge
- Issue Date
- ACS Macro Letters
- VOL 8, NO 9-1171
- 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 (POEG-MA23-PS) diblock polymer and the constituent POEG-MA23 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 (B mu E), followed by macroscopic phase separation, with increasing homopolymer content. The B mu E 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 B mu E 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.
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