Universality of Block Copolymer Melts
| Autor: | Glaser, Jens, Medapuram, Pavani, Beardsley, Thomas M., Matsen, Mark W., Morse, David C. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.113.068302 |
| Popis: | Simulations of five different coarse-grained models of symmetric diblock copolymer melts are compared to demonstrate a universal (i.e., model-independent) dependence of the free energy on the invariant degree of polymerization $\overline{N}$, and to study universal properties of the order-disorder transition (ODT). The ODT appears to exhibit two regimes: Systems of very long chains ($\overline{N} \gtrsim 10^{4}$) are well described by the Fredrickson-Helfand theory, which assumes weak segregation near the ODT. Systems of smaller but experimentally relevant values, $\overline{N} \lesssim 10^4$, undergo a transition between strongly segregated disordered and lamellar phases that, though universal, is not adequately described by any existing theory. Comment: 5 pages, 4 figures, plus Supplemental Material |
| Databáze: | arXiv |
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