Examining the Impact of Relative Mechanophore Activity on the Selectivity of Ultrasound-Induced Mechanochemical Chain Scission,ACS Macro Letters

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Examining the Impact of Relative Mechanophore Activity on the Selectivity of Ultrasound-Induced Mechanochemical Chain Scission
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-05-18 , DOI: 10.1021/acsmacrolett.2c00217
Anna C Overholts ₁ , Maxwell J Robb ₁

Affiliation

Despite recent advances in polymer mechanochemistry, a more complete understanding of the factors that dictate the ultrasound-induced mechanochemical activation efficiency of mechanophores is necessary. Here, we examine how the identity of a mechanophore, and hence its unique force-coupled reactivity, affects the competition between mechanophore activation and nonspecific polymer backbone scission. Polymers incorporating distinct mechanophores but with putatively similar “chain-centeredness” exhibit widely different mechanochemical activation efficiencies. Furthermore, we employ mechanophores that can be orthogonally cleaved following ultrasonication using heat or light to report on the degree of nonspecific backbone scission that occurs for different mechanophore-containing polymers subjected to ultrasound-induced mechanical force. Our results illustrate that the identity of the mechanophore as well as its position in the polymer chain are inextricably important parameters that together control the selectivity of mechanophore activation during ultrasonication.

中文翻译：

检查相对机械载体活性对超声诱导机械化学断链选择性的影响

尽管最近在聚合物机械化学方面取得了进展，但有必要更全面地了解决定机械载体的超声诱导机械化学活化效率的因素。在这里，我们研究了机械载体的特性以及其独特的力耦合反应性如何影响机械载体活化和非特异性聚合物主链断裂之间的竞争。包含不同机械载体但具有假定相似的“链中心性”的聚合物表现出广泛不同的机械化学活化效率。此外，我们采用可在超声波处理后使用热或光正交切割的机械载体，以报告在受到超声诱导的机械力的不同含机械载体的聚合物中发生的非特异性主链断裂程度。

更新日期：2022-05-18

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