期刊
POLYMER CHEMISTRY
卷 8, 期 34, 页码 5185-5193出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7py00435d
关键词
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资金
- NSF under the CCI Center for Selective C-H Functionalization [CHE-1205646, DMR-1533372, DMR-1708317]
- State of Washington through the University of Washington Clean Energy Institute
- NSF [NRT-DESE 1633216]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1205646] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1533987, 1533954] Funding Source: National Science Foundation
An alkyl-substituted indacenodithiophene-based donor-acceptor p-conjugated polymer (PIDTBPD) with low stiffness and high ductility is reported. The polymer was synthesized after DFT calculations predicted that it would have a kinked backbone conformation while showing strong intramolecular charge transfer (ICT), suggestive of the fact that it would be beneficial to the polymer's elasticity and charge mobility. Atom-efficient direct arylation polymerization (DArP) was exploited to synthesize the polymer. Mechanical studies indicate that PIDTBPD has relatively rapid stress-relaxation properties, which lead to a low elastic modulus of 200 MPa and high crack-onset strain of ca. 40% (lower limit). A moderate charge carrier mobility of 2 x 10(-3) cm(2) V-1 s(-1) with a current on/off ratio of 2.5 x 10(6) was obtained from the fabricated OFETs. Further experiments were performed to elucidate the structural aspects of this polymer: UV-Vis and PL spectra suggest that minimal conformational change occurs in the polymer between its diluted solution and thin film states; DSC measurements indicate that the polymer's T-g is below -20 degrees C, allowing it to be in a rubbery state at room temperature; and XRD studies support this observation suggesting that the polymer is mostly amorphous at room temperature.
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