| Autor: |
Bates, Morgan W., Lequieu, Joshua, Barbon, Stephanie M., Lewis III, Ronald M., Delaney, Kris T., Anastasaki, Athina, Hawker, Craig J., Fredrickson, Glenn H., Bates, Christopher M. |
| Předmět: |
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| Zdroj: |
Proceedings of the National Academy of Sciences of the United States of America; 7/2/2019, Vol. 116 Issue 27, p13194-13199, 6p |
| Abstrakt: |
The self-assembly of block polymers into well-ordered nanostructures underpins their utility across fundamental and applied polymer science, yet only a handful of equilibrium morphologies are known with the simplest AB-type materials. Here, we report the discovery of the A15 sphere phase in single-component diblock copolymer melts comprising poly(dodecyl acrylate)-block-poly(lactide). A systematic exploration of phase space revealed that A15 forms across a substantial range of minority lactide block volume fractions (fL = 0.25 - 0.33) situated between the σ-sphere phase and hexagonally close-packed cylinders. Self-consistent field theory rationalizes the thermodynamic stability of A15 as a consequence of extreme conformational asymmetry. The experimentally observed A15-disorder phase transition is not captured using mean-field approximations but instead arises due to composition fluctuations as evidenced by fully fluctuating field-theoretic simulations. This combination of experiments and field-theoretic simulations provides rational design rules that can be used to generate unique, polymer-based mesophases through selfassembly. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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