Mechanochemical unzipping of insulating polyladderene to semiconducting polyacetylene.
Zhixing ChenJaron A M MercerXiao-Lei ZhuJoseph A H RomaniukRaphael PfattnerLynette CegelskiTodd J MartinezNoah Z BurnsYan XiaPublished in: Science (New York, N.Y.) (2018)
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.