| 초록 |
This study introduces an attractive nanoemulsion (ANE) system that is characterized by the polymer chain conformation-driven reversible dipolar interaction between nanoemulsion drops. For this, we synthesized amphiphilic triblock copolymers (ATCs), poly(ethylene oxide)-b-poly(ε-caprolactone)-b-poly(ethylene oxide) (PEO-b-PCL-b-PEO) via urethane condensation reaction, while controlling their molecular weights and block ratios. When the PEO chain of ATCs is associated with the lecithin head, the interdrop dipolar attraction across different droplet surfaces occurred to form a percolated drop network. From the dense suspension rheology studies, interestingly, we figured out that the enhanced shear modulus of ANE fluids at 25 °C originated from the interdrop dipolar attraction. Furthermore, we found that as the molecular weight of PEO is increased, the interdrop association occurred more favorably, while displaying the reversible sol-gel transition in response to the temperature change. |
