Small-Angle X-ray Scattering of Concentration Dependent Structures in Block Copolymer Solutions
- Authors
- Choi, Soo-Hyung; Bates, Frank S.; Lodge, Timothy P.
- Issue Date
- Nov-2014
- Publisher
- American Chemical Society
- Citation
- Macromolecules, v.47, no.22, pp.7978 - 7986
- Journal Title
- Macromolecules
- Volume
- 47
- Number
- 22
- Start Page
- 7978
- End Page
- 7986
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16525
- DOI
- 10.1021/ma5016819
- ISSN
- 0024-9297
- Abstract
- The concentration and temperature dependence of the structure of a poly(styrene-b-ethylene-alt-propylene) (PSPEP) diblock copolymer in squalane, a highly selective solvent for the PEP block, was investigated using small-angle X-ray scattering (SAXS). With decreasing concentration, between 100% and 10% by weight, a nearly monodisperse PSPEP (block molecular weights of 42 000 g/mol and 62 000 g/mol for PS and PEP, respectively) exhibited lamellae (LAM), hexagonally packed cylinders (HEX), body-centered cubic spheres (BCC) and disordered spherical micelles. The results show that squalane (C30H62) is essentially completely segregated into the PEP domains, and thus it behaves like a short PEP homopolymer. With increasing amounts of squalane the conformation of the PS block changes from stretched to nearly fully relaxed at the lowest polymer concentrations.
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