Stabilizing the Ordered Bicontinuous Double Diamond Structure of Diblock Copolymer by Configurational Regularity
| Autor: | Takeshi Higuchi, Hiroshi Jinnai, Chih Hsuan Lin, Jing Cherng Tsai, Hsin-Lung Chen, Takeji Hashimoto |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry Diamond 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Inorganic Chemistry Crystal Crystallography Phase (matter) Tacticity Metastability 0103 physical sciences Materials Chemistry Melting point engineering Copolymer 010306 general physics 0210 nano-technology Gyroid |
| Zdroj: | Macromolecules. 51:4049-4058 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.7b02404 |
| Popis: | We investigate the formation of the ordered bicontinuous structures in a stereoregular diblock copolymer, isotactic polypropylene-block-polystyrene (iPP-b-PS), in which the minority PP block possessed isotactic configuration. This diblock displayed the conventional ordered bicontinuous double gyroid (OBDG) morphology upon heating above the crystal melting point of the iPP block from the as-cast state. The OBDG phase remained stable in the heating process up to the order–disorder transition. In the subsequent cooling process from the nearly disordered state, the OBDG phase first developed, but when the temperature was sufficiently low, an order–order transition from OBDG to the ordered bicontinuous double diamond (OBDD) phase occurred, and OBDD eventually became the dominant structure. The results attested that OBDD and OBDG represented the thermodynamically stable structure at the lower and the higher temperature, respectively, and the OBDG morphology formed in the as-cast state was metastable. The presen... |
| Databáze: | OpenAIRE |
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