Phase diagram for blends of styrene-butadiene diblock copolymer and styrene-butadiene random copolymer
SCIE
SCOPUS
- Title
- Phase diagram for blends of styrene-butadiene diblock copolymer and styrene-butadiene random copolymer
- Authors
- Lee, HK; Kim, DC; Yoo, SI; Sohn, BH; Zin, WC
- Date Issued
- 2003-10-07
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The phase behaviors of the blends of diblock copolymers and random copolymers were investigated with synchrotron small-angle X-ray scattering, light scattering, differential scanning calorimetry, and transmission electron microscopy techniques. The temperature, T-ODT, at which the order-disorder transition (ODT) takes place, was obtained as a function of the fraction of random copolymers. The phase diagram shows three regions: homogeneous liquid phase, ordered mesophase, and a two-phase region. When the fraction of random copolymer is lower than 0.15, T-ODT decreases linearly as the random copolymer fraction increases. Above 0.15, the macroscopic phase separation is dominant, and T-ODT is nearly constant in the middle range of the fraction. We discussed phase behavior on the basis of the free energy change on mixing of a diblock copolymer and a random copolymer.
- Keywords
- ORDER-DISORDER TRANSITION; X-RAY-SCATTERING; BLOCK-COPOLYMER; MOLECULAR-WEIGHT; MICROPHASE SEPARATION; HOMOPOLYMER MIXTURES; EQUILIBRIA; BEHAVIOR; POLYSTYRENE; SOLVENTS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29731
- DOI
- 10.1021/MA030020W
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 36, no. 20, page. 7740 - 7745, 2003-10-07
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- There are no files associated with this item.
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