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Crystal Orientation Changes in Two-Dimensionally Confined Nanocylinders in a Poly(ethylene oxide)-b-polystyrene/Polystyrene Blend
Abstract
A lamella-forming poly(ethylene oxide)- b -polystyrene (PEO- b -PS) diblock copolymer has been blended with a low molecular weight polystyrene (PS) homopolymer to form a miscible polymer blend. The PEO volume fraction is 0.32, and the order−disorder transition temperature ( T ODT ) of this blend is 175 °C. Therefore, the PEO blocks form nanocylinders surrounded by a PS matrix below the T ODT . Since the glass transition temperature of the PS is 64 °C and the PEO crystal melting occurs at ∼50 °C, the PEO-block crystallization takes place in a two-dimensionally confined glassy environment. The cylinder diameter is determined to be 13.7 nm, based on small-angle X-ray scattering (SAXS) and transmission electron microscopy results. Using simultaneous two-dimensional SAXS and wide-angle X-ray scattering techniques, the crystal orientation (the c -axes of the PEO crystals) within the nanocylinders is found to change simply depending upon the crystallization temperature ( T c ). At very low T c (<−30 °C), PEO crystals are randomly oriented within the confined cylinders. Starting at T c = −30 °C, the crystal orientation changes to be inclined with respect to the cylinder axis, â . The tilt angle from â continuously increases with increasing T c, and finally it becomes 90° when T c ≥ 2 °C. Crystallographic analysis indicates that the crystal c -axis orientation at each T c corresponds to a uniform crystal orientation.
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Metadata
- Authors
- Huang, P., Zhu, L., Cheng, S. Z. D., Ge, Q., Quirk, R. P., Thomas, E. L., Lotz, B., Hsiao, B. S., Liu, L., & Yeh, F.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-08-14
- Volume
- 34
- Issue
- 19
- Pages
- 6649-6657
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2012834006
- Cited by
- 163
- References
- 3
- FWCI
- 7.57
- Type
- journal article
- Language
- en
- Open access
- closed
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