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Author

Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

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Phase transition behavior in thin films of block copolymers by use of immiscible solvent vapors

Cited 10 times inthomson ciCited 13 times inthomson ci
Title
Phase transition behavior in thin films of block copolymers by use of immiscible solvent vapors
Author
Kim, BokyungHong, Sung WooPark, SoojinXu, JiHong, Sung-KwonRussell, Thomas P.
Keywords
De-wetting; Immiscible solvents; Kinetic pathway; Lateral ordering; Micro-domains; Non-volatile; Transition behavior; Volatile solvents
Issue Date
201101
Publisher
ROYAL SOC CHEMISTRY
Citation
SOFT MATTER, v.7, no.2, pp.443 - 447
Abstract
The phase transitions in thin films of a block copolymer, BCP, that forms micelles when exposed to immiscible solvent vapors, were investigated at two different temperatures. Pre-swelling with a nonvolatile solvent was used to prevent dewetting prior to the addition of a volatile solvent used to affect the annealing. The temperature and, therefore, the vapor pressure of the solvent were varied, which gave rise to remarkably different kinetic pathways of lateral ordering of the BCP. At 22 degrees C, a rapid annihilation of defects occurred with exchange of BCP chains between domains. At 17 degrees C, a slow coalescence of two adjacent domains led to enhanced lateral ordering of the swollen BCP microdomains and also led to domains twice as large as those observed at 22 degrees C. These studies suggest that the large interfacial energy arising from the immiscibility of the components, coupled with an incommensurability of the swollen film thickness with the period of the BCP morphology, gave rise to the observed differences and subsequent lateral ordering of the BCP microdomains.
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DOI
http://dx.doi.org/10.1039/c0sm00422g
ISSN
1744-683X
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