Phase Behavior of Polystyrene-b-poly(methyl methacrylate) Diblock Copolymer
- Authors
- Ahn, Hyungju; Ryu, Du Yeol; Kim, Youngmin; Kwon, Kyung Wook; Lee, Jumi; Cho, Junhan
- Issue Date
- 27-Oct-2009
- Publisher
- AMER CHEMICAL SOC
- Citation
- MACROMOLECULES, v.42, no.20, pp.7897 - 7902
- Journal Title
- MACROMOLECULES
- Volume
- 42
- Number
- 20
- Start Page
- 7897
- End Page
- 7902
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/21783
- DOI
- 10.1021/ma901313a
- ISSN
- 0024-9297
- Abstract
- The phase behavior of polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) copolymers of various Molecular weights has been studied by using small-angle X-ray scattering (SAXS) and depolarized light scattering (DLS). The empirical Flory chi, determined from scattering intensity profiles for a fully disordered PS-b-PMMA copolymer, was shown to behave differently depending on temperature range. chi was described mostly by enthalpic contribution at higher temperatures, but a dominant entropic contribution appeared in chi at lower temperatures. The order-disorder transition (ODT) temperatures for the series of copolymers with the controlled molecular weights were directly measured through SAXS and DLS. The resultant ODTs were then compared with a compressible random-phase approximation theory to determine cross interactions between block components. It was found that effective chi from theory is also mostly described by enthalpic contribution, which yields a moderate change in ODT upon the increase of copolymer molecular weight. In addition, we discussed the pressure response of the copolymer using chi from theory.
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