BCC Grain Formation Triggered by Miscibility Jump on Temperature Drop
| Autor: | Akifumi Matsushita, Eiko Tamura, Shigeru Okamoto, Tadashi Inoue |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Polymers and Plastics Small-angle X-ray scattering Scattering Induction period Organic Chemistry Thermodynamics Miscibility Inorganic Chemistry Crystallography chemistry.chemical_compound Grain growth Differential scanning calorimetry Rheology chemistry Materials Chemistry Polystyrene |
| Zdroj: | Macromolecules. 48:1813-1823 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.5b00024 |
| Popis: | Formation of a body-centered cubic (BCC) structure and grain growth process triggered by segregation-power jump on a temperature drop was studied by small-angle X-ray scattering (SAXS), rheology, and differential scanning calorimetry (DSC). Polystyrene-block-poly(ethylene-alt-propylene) (SEP) was dissolved in tridecyl-2,2,4-trimethyl hexanoate (salacos913) that was a practically neutral good solvent for both of polystyrene (PS) and PEP block chains at temperature above 84 °C (Tsol), while it was highly selective (good for PEP) below Tsol. Spherical microdomains in a short-range liquid-like order were formed above Tsol; the system was in the so-called “lattice disordered state”, designated as disordered sphere. The solution was annealed at a temperature (130 °C) above Tsol for 10 min and successively subjected to a temperature drop across Tsol. The system stayed in the lattice-disordered state for a certain induction period. During this induction period, stronger segregation power at the lower temperature ... |
| Databáze: | OpenAIRE |
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