Direct observation of a diblock copolymer-induced microemulsion at a polymer/polymer interface
| Autor: | K. D. Jandt, Z. Xu, E. J. Kramer, B. D. Edgecombe, Jean M. J. Fréchet |
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| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Annealing (metallurgy) Polymer Condensed Matter Physics Surface tension chemistry.chemical_compound chemistry Chemical engineering Transmission electron microscopy Polymer chemistry Volume fraction Materials Chemistry Copolymer Microemulsion Polystyrene Physical and Theoretical Chemistry |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 33:2351-2357 |
| ISSN: | 1099-0488 0887-6266 |
| DOI: | 10.1002/polb.1995.090331706 |
| Popis: | We have studied the segregation of a block copolymer of poly(d8-styrene-b-2-vinylpyridine) (dPS-PVP) at the interface between polystyrene and a random copolymer of poly(styreneran-4-hydroxystyrene) (PS-r-PPHS). Forward recoil spectrometry (FRES) was used to measure the equilibrium excess (z*) of the dPS-PVP chains at the interface as a function of its volume fraction in the bulk PS phase (ϕ∞). It was found that there is a sharp increase in z* at a critical value of ϕ∞. This upturn indicates the formation of a microemulsion of PS and the random copolymer PS-r-PPHS due to a vanishing of the interfacial tension caused by the strong adsorption of the block copolymer. Cross-sectional transmission electron microscopy (TEM) of the interface shows that this microemulsion starts to form at the interface by forming a deeply corrugated structure where the “wavelength” of the corrugations is of the order of 50 nm. © 1995 John Wiley & Sons, Inc. |
| Databáze: | OpenAIRE |
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