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首页> 外文期刊>ACS Macro Letters >Comparison of Mechanochemical Chain Scission Rates for Linear versus Three-Arm Star Polymers in Strong Acoustic fields
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Comparison of Mechanochemical Chain Scission Rates for Linear versus Three-Arm Star Polymers in Strong Acoustic fields

机译：在强声场中线性和三臂星形聚合物的机械化学断链速率比较

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The effect of star versus linear polymer architecture on the rates of mechanochemically induced bond scission has been explored. We determined rate constants for chain scission of parent linear and star polymers, from which daughter fragments were cleanly resolved. These studies con?rm a mechanistic interpretation of star polymer chain scission that is governed by the spanning rather than total molecular weight. We further demonstrate the preserved rate of site-selective mechanophore activation across two different polymer structures. Speci?cally, we observed consistent activation rate constants from three-arm star and linear polymer analogues, despite the Mn of the star polymer being 1.5 times greater than that of the linear system.
机译：已经研究了星形与线性聚合物结构对机械化学诱导的键断裂速率的影响。我们确定了母体线性和星形聚合物断链的速率常数，从中可以清晰地拆分子片段。这些研究证实了星形聚合物断链的机理解释是由跨度而不是总分子量决定的。我们进一步证明了在两个不同的聚合物结构上的位点选择性机械活化的保留速率。具体来说，尽管星形聚合物的Mn比线性体系大1.5倍，但我们观察到三臂星形和线性聚合物类似物的活化速率常数一致。

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