In the field of polymer mechanochemistry, the activation of mechanophores within linear polymers in the bulk state is often limited by low activation rates. Herein, we demonstrate that the crystallization of polymers can significantly enhance the activation of mechanophores. Employing rhodamine-containing poly(lactic acid) (PLA) and polycaprolactone (PCL) as representative examples, our study reveals that the micromechanical force generated by crystallization is more effective in activating mechanophores than the macroscopic mechanical force induced by compression and ultrasonication, which is particularly pronounced for polymers with low molecular weights. Furthermore, the activation of the mechanophore is found to be positively correlated with the degree of crystallinity and polymer molecular weight, whereas the chirality of polymers does not influence the activation. This study offers new insights into mechanochemical reactions induced by polymer crystallization and provides a novel approach to enhancing mechanochemical reactivity.

中文翻译：

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通过聚合物结晶增强机械基团活化


在聚合物机械化学领域，本体态线性聚合物内机械基团的活化通常受到低活化速率的限制。在此，我们证明了聚合物的结晶可以显着增强机械团的活化。以含罗丹明的聚乳酸 （PLA） 和聚己内酯 （PCL） 为代表例子，我们的研究表明，结晶产生的微机械力比压缩和超声引起的宏观机械力更有效地激活机械载体，这对于低分子量的聚合物尤其明显。此外，发现机械基团的活化与结晶度和聚合物分子量呈正相关，而聚合物的手性不影响活化。这项研究为聚合物结晶诱导的机械化学反应提供了新的见解，并为增强机械化学反应性提供了一种新方法。