An indacenodithiophene-based semiconducting polymer with high ductility for stretchable organic electronics
An indacenodithiophene-based semiconducting polymer with high ductility for stretchable organic electronics
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DOI：
10.1039/c7py00435d
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发表时间：
2017-08
影响因子：
4.6
通讯作者：
Yilin Li;Wesley K. Tatum;J. Onorato;Sierra D. Barajas;Yunxin Yang;C. Luscombe
中科院分区：
文献类型：
--
作者：
Yilin Li;Wesley K. Tatum;J. Onorato;Sierra D. Barajas;Yunxin Yang;C. Luscombe
报道了一种具有低刚度和高延展性的烷基取代的茚并二噻吩基供体-受体π-共轭聚合物（PIDTBPD）。该聚合物是在 DFT 计算预测后合成的，它具有扭结的主链构象，同时表现出强大的分子内电荷转移（ICT），这表明这将有利于聚合物的弹性和电荷迁移率。利用原子效率直接芳基化聚合（DArP）来合成聚合物。力学研究表明，PIDTBPD 具有相对快速的应力松弛特性，导致 200 MPa 的低弹性模量和约 200 MPa 的高裂纹起始应变。 40%（下限）。从制造的 OFET 中获得了 2 × 10−3 cm2 V−1 s−1 的中等载流子迁移率，电流开/关比为 2.5 × 106。进行了进一步的实验来阐明该聚合物的结构：UV-Vis 和 PL 光谱表明，聚合物在其稀释溶液和薄膜状态之间发生最小的构象变化； DSC测量表明该聚合物的Tg低于-20℃，使其在室温下处于橡胶态； XRD 研究支持了这一观察结果，表明该聚合物在室温下大部分是无定形的。
An alkyl-substituted indacenodithiophene-based donor–acceptor π-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 × 10−3 cm2 V−1 s−1 with a current on/off ratio of 2.5 × 106 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 Tg is below −20 °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.