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  • Title: Self-assembly of all-conjugated poly(3-alkylthiophene) diblock copolymer nanostructures from mixed selective solvents.
    Author: He M, Zhao L, Wang J, Han W, Yang Y, Qiu F, Lin Z.
    Journal: ACS Nano; 2010 Jun 22; 4(6):3241-7. PubMed ID: 20469844.
    Abstract:
    The use of mixed selective solvents provides an effective means to control self-assembly of the all-conjugated diblock copolymer poly(3-butylthiophene)-b-poly(3-hexylthiophene) (P3BHT) into nanostructured morphologies. The solvent and temperature effects on the self-assembly of P3BHT during cooling and subsequent crystallization were explored for the first time. Depending on the poor/good solvent ratio (i.e., anisole/chloroform), P3BHT chains experience different kinetic pathways, yielding nanowires at a low anisole/chloroform ratio (< or =2:1), and nanorings coexisted with some nanowires at a high anisole/chloroform ratio (> or =6:1). The nanowires are formed as a direct consequence of strong interchain pi-pi stacking, while the formation of nanorings is governed by solvophobic interactions between conjugated blocks and the poor solvent anisole to minimize the unfavorable contacts between the P3BT block ( approximately 50 degrees C) and later P3HT (below 35 degrees C) block and anisole.
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