Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 54, Issue 5, Pages 544-551Publisher
WILEY
DOI: 10.1002/polb.23943
Keywords
block copolymers; conjugated polymers; rod-coil; solvent blending; self-assembly
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Funding
- National Natural Science Foundation of China [21274029]
- National Basic Research Program of China [2011CB605700]
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The use of mixed solvents provided an effective way to control the self-assembly behavior and photophysical properties of a conjugated rod-coil block copolymer, poly(3-hexylthiophene)-b-poly(ethylene oxide) (P3HT-b-PEO). It was shown that the balance between the - stacking of the P3HT and microphase separation of the copolymer could be dynamically controlled and shifted by solvent blending. Depending on the mixed solvent ratio (i.e., chloroform/methanol, anisole/chloroform, or anisole/methanol), the copolymer chains experienced different kinetic pathways, yielding a series of nanostructures such as disordered wormlike pattern, densely packed nanofibrils, and isolated nanofibrils. With the varying solvent selectivity, the P3HT-b-PEO chains displayed a hybrid photophysical property depending on the competition between intrachain and interchain excitonic coupling, resulting in the transformation between J- and H-aggregation. Overall, this work offered an effective way to demonstrate the correlation and transformation between - stacking of P3HT and microphase separation, and how the conformation of P3HT chains influenced the photophysical properties of the copolymer during solvent blending. (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 544-551
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