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Influence of amide-containing side chains on the mechanical properties of diketopyrrolopyrrole-based polymers

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Abstract

An efficient strategy to modulate the mechanical properties of conjugated polymers has been developed through the incorporation of amide-containing alkyl chains in diketopyrrolopyrrole-based conjugated polymers. The side-chain engineering performed with hydrogen bonding moieties (up to 20 mol% of amide-containing side-chains) was found to reduce the crystallinity of the conjugated polymers in the solid state. Interestingly, this reduction in crystallinity drastically influenced the mechanical properties of the new DPP-polymers, by promoting their stretching ability, reducing the elastic modulus of the polymers, and facilitating the molecular alignment after stretch. The resulting polymers with 10% hydrogen bonding side chains showed a maximum stretchability of 75% elongation, without the appearance of nanoscale cracks, and a detailed investigation of the mechanical properties was performed by a combination of morphological characterization tools, including grazing-incidence X-ray diffraction, polarized UV-Vis spectroscopy and optical/atomic force microscopy to support our finding. Additionally, incorporation of amide-containing side-chains also enabled the regeneration of the conjugated polymer morphology after damage. Our results demonstrate that the introduction of amide-containing alkyl chains is an effective strategy to enhance the mechanical properties of π-conjugated polymers without disrupting the π-conjugation, and to enable new properties such as morphological healing.

Graphical abstract: Influence of amide-containing side chains on the mechanical properties of diketopyrrolopyrrole-based polymers

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Publication details

The article was received on 14 Aug 2018, accepted on 27 Oct 2018 and first published on 30 Oct 2018


Article type: Paper
DOI: 10.1039/C8PY01207E
Citation: Polym. Chem., 2018, Advance Article
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    Influence of amide-containing side chains on the mechanical properties of diketopyrrolopyrrole-based polymers

    M. U. Ocheje, M. Selivanova, S. Zhang, T. H. Van Nguyen, B. P. Charron, C. Chuang, Y. Cheng, B. Billet, S. Noori, Y. Chiu, X. Gu and S. Rondeau-Gagné, Polym. Chem., 2018, Advance Article , DOI: 10.1039/C8PY01207E

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