期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 37, 期 19, 页码 1623-1628出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201600377
关键词
conjugated polymers; mechanical properties; structure-property relationships; bulk heterojunctions; stretchable electronics
资金
- Air Force Office of Scientific Research (AFOSR) [FA9550-16-1-0220]
- National Science Foundation Graduate Research Fellowship [DGE-1144086]
- Kaplan Dissertation Year Fellowship
- Office of Naval Research (ONR) Young Investigator Program [N00014-16-1-2551]
- Purdue University
- National Science Foundation [ECCS-1542148]
Increasing the flexibility of polymer chains is a common method of increasing the deformability of solid polymeric materials. Here, the effects of conjugation-break spacers (CBSs)-aliphatic units that interrupt the sp(2)-hybridized backbone of semiconducting polymers-on the mechanical and photovoltaic properties of a diketopyrrolopyrrole-based polymer are described. Unexpectedly, the tensile moduli and cracking behavior of a series of polymers with repeat units bearing 0%, 30%, 50%, 70%, and 100% of the CBS are not directly related to the percent incorporation of the flexible unit. Rather, the mechanical properties are a strong function of the order present in the film as determined by grazing-incidence x-ray diffraction. The effect of the CBSs on the photovoltaic performance of these materials, on the other hand, is more intuitive: it decreases with increasing fraction of the flexible units. These studies highlight the importance of solid-state packing structureas opposed to only the flexibility of the individual moleculesin determining the mechanical properties of a conjugated polymer film for stretchable, ultraflexible, and mechanically robust electronics.
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