Mechanochromic Break Points Control the Toughness of Entangled Polyphenylenes

IF 5.1 Q1 POLYMER SCIENCE
Annina Missikewitsch, Hartmut Komber, Till Biskup, Michael Sommer
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Abstract

Toughness engineering of a kinked polyphenylene (PmmpP) is demonstrated by using mechanochromic molecular break points. Varying amounts of thermally stable yet mechanically labile difluorenylsuccinonitrile (DFSN) motifs incorporated into PmmpP allow to largely tune mechanical failure of the specimen. While strain at break values of pristine PmmpP reach up to 300%, an increasing concentration of DFSN break points leads to a strongly decreasing and predictable strain at break. Homolytic bond scission of DFSN and formation of colored DFSN radicals is characterized by in situ UV–vis spectroscopy, which allows us to discern regions of necking and strain hardening during tensile testing. The formation and lifetime of radicals is further probed by EPR spectroscopy, suggesting reversibility of bond scission and thus the possibility to design tough materials with predicted failure and self-healing properties.

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来源期刊
CiteScore
10.40
自引率
3.40%
发文量
209
审稿时长
1 months
期刊介绍: ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.
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