Effect of Ion Concentration on the Formation of Bicontinuous Microemulsions in Partially Charged Ternary Polymer Blends

Title
Effect of Ion Concentration on the Formation of Bicontinuous Microemulsions in Partially Charged Ternary Polymer Blends
Authors
심지민Shuyi XieFrank S. BatesTimothy P. Lodge
Issue Date
2019-12
Publisher
Macromolecules
Citation
VOL 52, NO 23-9424
Abstract
We describe the formation of bicontinuous microemulsions (B mu E) from a series of three model charged ternary polymer blends comprising an AB diblock copolymer and the constituent A and B homopolymers, where A is a partially charged poly[(oligo(ethylene glycol) methyl ether methacrylate-co-oligo(ethylene glycol) propyl sodium sulfonate methacrylate)] (POEGMA) block with systematically tuned ion concentration and B is a neutral polystyrene (PS) block. The mole fraction of charged groups in the POEGMA block and the corresponding POEGMA homopolymer was 7, 23, or 36%. The phase diagrams of ternary blends with variable ion concentrations have been mapped out along the volumetrically symmetric isopleth by using a combination of rheology, small-angle neutron and X-ray scattering, and cloud point measurements. A well-defined B mu E channel is found over an unusually wide range of homopolymer compositions (2-7%), in the proximity of the Lifshitz multicritical point anticipated by mean-field theory. While the ion concentration significantly impacts both the morphological length scale and the extent of the B mu E phase over a wide range of compositions and temperatures, it is remarkable that the B mu E persists over a significant range of segregation strength. This study provides new insight into the rational design of charged ternary polymer blends to tune the structural characteristics of the B mu E by modulating ion concentration.
URI
http://pubs.kist.re.kr/handle/201004/71118
ISSN
0024-9297
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KIST Publication > Article
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