Three-Layer Micelles of an ABC Block Copolymer: NMR, SANS, and LS Study of a Poly(2−ethylhexyl acrylate)-block-poly(methyl methacrylate)-block-poly(acrylic acid) Copolymer in D2O
| Autor: | Zdeněk Tuzar, H. Pospíšil, Jaroslav Kříž, D. Doskočilová, Bohumil Masař, Josef Pleštil |
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| Rok vydání: | 1998 |
| Předmět: |
Acrylate
Materials science Polymers and Plastics Organic Chemistry technology industry and agriculture Micelle Poly(methyl methacrylate) Inorganic Chemistry chemistry.chemical_compound Dynamic light scattering chemistry visual_art Polymer chemistry Materials Chemistry visual_art.visual_art_medium Copolymer Static light scattering Methyl methacrylate Acrylic acid |
| Zdroj: | Macromolecules. 31:41-51 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma9708003 |
| Popis: | A poly(2-ethylhexyl acrylate)-block-poly(methyl methacrylate)-block-poly(acrylic acid) (PEHA−PMMA−PAAc) triblock copolymer was prepared by group transfer polymerization (GTP) and subsequent acidolysis. When transferred from a molecular solution into water or D2O, the copolymer is shown, by static light scattering (SLS) and dynamic light scattering (DLS), to form spherical micelles of a narrow size distribution. According to NMR line shape and signal intensity analysis, and SANS measurements using contrast variation by a selective swelling of PEHA blocks with cyclohexane-d12, the three block types are mostly segregated in a micelle, PEHA forming the inner and PMMA the outer layer of the core. Both methods indicate an existence of mixed layers in which the blocks PEHA−PMMA (in the core) and PMMA−PAAc (at the outer rim of the core) are entangled. NMR data point to the temperature-dependent conflict of the influence between the PEHA compression resistance and the core−shell interface tension. Solvents general... |
| Databáze: | OpenAIRE |
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