Polymer Mechanochemistry in Microbubbles,Advanced Materials

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Polymer Mechanochemistry in Microbubbles
Advanced Materials ( IF 27.4 ) Pub Date : 2023-07-26 , DOI: 10.1002/adma.202305130
Mingjun Xuan _{1,

2} , Jilin Fan _{1,

2} , Vu Ngoc Khiêm ₃ , Miancheng Zou _{1,

2} , Kai-Oliver Brenske _{1,

2} , Ahmed Mourran ₁ , Rostislav Vinokur ₁ , Lifei Zheng _{1,

4} , Mikhail Itskov ₃ , Robert Göstl _{1,

2} , Andreas Herrmann _{1,

2}

Affiliation

Polymer mechanochemistry is a promising technology to convert mechanical energy into chemical functionality by breaking covalent and supramolecular bonds site-selectively. Yet, the mechanochemical reaction rates of covalent bonds in typically used ultrasonication setups lead to reasonable conversions only after comparably long sonication times. This can be accelerated by either increasing the reactivity of the mechanoresponsive moiety or by modifying the encompassing polymer topology. Here, a microbubble system with a tailored polymer shell consisting of an N₂ gas core and a mechanoresponsive disulfide-containing polymer network is presented. It is found that the mechanochemical activation of the disulfides is greatly accelerated using these microbubbles compared to commensurate solid core particles or capsules filled with liquid. Aided by computational simulations, it is found that low shell thickness, low shell stiffness and crosslink density, and a size-dependent eigenfrequency close to the used ultrasound frequency maximize the mechanochemical yield over the course of the sonication process.

更新日期：2023-07-26

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