Mechanochemical unzipping of insulating polyladderene to semiconducting polyacetylene
Mechanochemical unzipping of insulating polyladderene to semiconducting polyacetylene
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DOI：
10.1126/science.aan2797
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发表时间：
2017-08-04
期刊：
影响因子：
56.9
通讯作者：
Xia, Yan
中科院分区：
文献类型：
--
作者：
Chen, Zhixing;Mercer, Jaron A. M.;Xia, Yan
生物系统以复杂的方式感知和响应机械刺激。在努力开发将机械力转化为其内在性质多重变化的合成材料的过程中，我们报告了一种机械化学响应的非共轭聚合物，该聚合物通过对大分子结构的广泛重排来响应力，从而转化为共轭聚合物。我们的设计基于简单的机械化学解压缩聚ladderene，这是一种受脂质天然产物结构启发的聚合物，通过直接复分解聚合制备。所得的聚乙炔嵌段共聚物具有较长的共轭长度和均匀的反式构型，并可自组装成半导体纳米线。计算支持ladene单元的串联解压缩机构。
Biological systems sense and respond to mechanical stimuli in a complex manner. In an effort to develop synthetic materials that transduce mechanical force into multifold changes in their intrinsic properties, we report on a mechanochemically responsive nonconjugated polymer that converts to a conjugated polymer via an extensive rearrangement of the macromolecular structure in response to force. Our design is based on the facile mechanochemical unzipping of polyladderene, a polymer inspired by a lipid natural product structure and prepared via direct metathesis polymerization. The resultant polyacetylene block copolymers exhibit long conjugation length and uniform trans-configuration and self-assemble into semiconducting nanowires. Calculations support a tandem unzipping mechanism of the ladderene units.