Influence of Acceptor Side-Chain Length and Conjugation-Break Spacer Content on the Mechanical and Electronic Properties of Semi-Random Polymers
Influence of Acceptor Side-Chain Length and Conjugation-Break Spacer Content on the Mechanical and Electronic Properties of Semi-Random Polymers
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DOI：
10.1021/acsapm.9b00115
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发表时间：
2019-04
影响因子：
5
通讯作者：
Elizabeth L. Melenbrink;Kristan Hilby;Kartik Choudhary;S. Samal;Negar Kazerouni;John Luke McConn;D. Lipomi;B. Thompson
中科院分区：
文献类型：
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作者：
Elizabeth L. Melenbrink;Kristan Hilby;Kartik Choudhary;S. Samal;Negar Kazerouni;John Luke McConn;D. Lipomi;B. Thompson
共轭断裂间隔基（CBS）已被证明可以提高共轭聚合物的机械性能。特别地，CBS单元掺入半无规聚合物中揭示了高延展性和低弹性模量，这归因于CBS单元和半无规结构的组合影响。为了进一步阐明这些聚合物的结构-性能关系，本文报道了两个新的半无规聚合物家族。在第一种方法中，合成了引入二酮基吡咯并吡咯（DPP）单元的基于聚（3-己基噻吩）的半无规聚合物，其中引入了10 - 40%的具有4-10个碳的CBS单元和当量含量的2-癸基十四烷基-DPP（dtdDPP），以克服先前用2-乙基己基-DPP（ehDPP）观察到的溶解度限制。这些聚合物具有更高的溶解性，可以获得更高的分子量，形成具有高完整性的膜，并显示出非凡的机械性能，弹性模量低至5.45 MPa，断裂伸长率为1.5%。
Conjugation-break spacers (CBS) have been shown to enhance the mechanical properties of conjugated polymers. In particular, incorporation of CBS units into semi-random polymers has revealed high ductility and low elastic moduli, attributed to the combined influence of the CBS units and the semi-random architecture. To further elucidate the structure–property relationships in these polymers, two new families of semi-random polymers are reported here. In the first, poly(3-hexylthiophene)-based semi-random polymers incorporating diketopyrrolopyrrole (DPP) units were synthesized in which CBS units with 4–10 carbons were incorporated from 10 to 40% with an equivalent content of 2-decyltetradecyl-DPP (dtdDPP) to overcome solubility limitations previously observed with 2-ethylhexyl-DPP (ehDPP). These polymers had much higher solubility and could attain higher molecular weights, formed films with high integrity, and displayed extraordinary mechanical properties, with elastic moduli as low as 5.45 MPa and fracture...