Morphology Reentry with a Change in Degree of Chain Asymmetry in Neat Asymmetric Linear A1BA2 Triblock Copolymers
| Autor: | Kenichi Tanida, Norihiro Shimizu, Hiroyuki Kurimura, Shunsuke Munakata, Kimiyuki Shirouchi, Jun Watanabe, Katsuhiro Yamamoto, Takeshi Oda, Shinichi Sakurai, Shigeru Suzuki |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Morphology (linguistics) Polymers and Plastics Small-angle X-ray scattering Organic Chemistry Thermodynamics 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Polybutadiene Lamella (surface anatomy) chemistry Transmission electron microscopy Polymer chemistry Materials Chemistry Copolymer Polystyrene 0210 nano-technology |
| Zdroj: | Macromolecules. 50:8647-8657 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | We report experimental results on relationship between polymer chain architecture and morphology of microdomains of asymmetric linear triblock copolymers, S1BS2 (S: polystyrene; B: polybutadiene). For this purpose, we synthesized various asymmetric triblock copolymers having different lengths of two end-blocks. The morphology was examined by small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). Although total molecular weight, composition, and thermal annealing temperature were kept constant, the morphology was found to change with a degree of chain asymmetry. One typical example exhibits a morphological change as cylinder → lamella → cylinder with a decrease in length of the shorter S2 end-block chains, while keeping the total molecular weight and the total polystyrene composition constant. This curious morphological behavior exhibiting a re-entrant type change is qualitatively in accord with the self-consistent field theory (SCFT) results by Matsen [J. Chem. Phys. 2000, 113, 55... |
| Databáze: | OpenAIRE |
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