Journal
MACROMOLECULES
Volume 51, Issue 16, Pages 6352-6358Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.8b00898
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Funding
- NSF under CCI Center for Selective C-H Functionalization [CHE-1700982]
- State of Washington through the University of Washington Clean Energy Institute
- NSF NRT-DESE [1633216]
- National Science Foundation [1542101, 1337840, 0335765]
- National Institutes of Health
- Molecular Engineering & Sciences Institute
- Clean Energy Institute
- Washington Research Foundation
- M. J. Murdock Charitable Trust
- Altatech
- ClassOne Technology
- GCE Market
- SPTS
- [DMR-1533372]
- [DMR-1708317]
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A series of alkyl-substituted indacenodithiophene (alkyl-IDT) semiconducting donor-acceptor polymers were designed by DFT to have varying degrees of backbone planarity and synthesized via direct arylation polymerization (DArP). These polymers exhibit weak intermolecular interactions, a glass transition temperature (T-g) below room temperature, and low degrees of crystallinity from XRD measurements. Despite this, the field-effect mobilities (mu) of these polymers are relatively high (0.06-0.20 cm(2) s(-1)) with mobility increasing with increasing backbone planarity. Because of the weak intermolecular interactions, the polymers exhibit low elastic moduli (E-f) of less than 450 MPa. The polymer with the most twisted backbone exhibits high ductility with a crack-onset strain (CoS) over 100%. These structure-property relationship studies provide useful guidelines for designing semiconducting polymers with high mobility, low stiffness, and high ductility enabling applications in stretchable electronics.
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