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Issue 40, 2019
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Effect of a conjugated/elastic block sequence on the morphology and electronic properties of polythiophene based stretchable block copolymers

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Abstract

We report the synthesis, morphology, and electronic properties of intrinsically stretchable AB-type, ABA-type, and BAB-type block copolymers (BCPs) of poly(3-hexylthiophene) (P3HT: A block) and elastic poly(octylene oxide) (POO: B block). By incorporating the soft coils, all BCP thin films exhibited clear self-assembled fibrillary nanostructures and largely improved stretchable mechanical properties within the films. The results from the absorption spectra and AFM images indicated that the self-assembled structures of the P3HT blocks in the block copolymers were related to the backbone sequences. Also, the phased-separated morphology of the AB-, ABA-, and BAB-block copolymers from GI-SAXS showed the average nanofibril d-spacing ranging from 17.9, 21.6, and 13.9 nm, respectively, which led to the same order on the formed nanofibril density. Among all the BCPs, only the ABA-type BCP thin film remains perfectly smooth and no wrinkle or crack is observed even up to the strain of 100%. These results indicate the significance of the conjugated/elastic block sequence for the morphology and physical properties of the prepared block copolymers. The resistive memory devices fabricated in the configuration of PDMS (substrates)/CNTs (bottom electrode)/BCP thin films (active layer)/Al (top electrode) exhibited non-volatile flash characteristics. In particles, the as-fabricated resistive memory device with the ABA-type BCP could endure up to 80% strain and an excellent ON/OFF current ratio was also achieved after 500 continuous stretching/releasing cycles under 50% strain. This work highlights the importance of molecular architectures on the conjugated/elastic ratios of BCPs for stretchable devices.

Graphical abstract: Effect of a conjugated/elastic block sequence on the morphology and electronic properties of polythiophene based stretchable block copolymers

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Publication details

The article was received on 13 Aug 2019, accepted on 13 Sep 2019 and first published on 13 Sep 2019


Article type: Paper
DOI: 10.1039/C9PY01216H
Polym. Chem., 2019,10, 5452-5464

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    Effect of a conjugated/elastic block sequence on the morphology and electronic properties of polythiophene based stretchable block copolymers

    Y. Chiang, S. Kobayashi, T. Isono, C. Shih, T. Shingu, C. Hung, H. Hsieh, S. Tung, T. Satoh and W. Chen, Polym. Chem., 2019, 10, 5452
    DOI: 10.1039/C9PY01216H

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