Kean Zachary S, Gossweiler Gregory R, Kouznetsova Tatiana B, Hewage Gihan B, Craig Stephen L
Department of Chemistry, Duke University, French Family Science Center, Durham, NC 27708-0346, USA.
Chem Commun (Camb). 2015 Jun 4;51(44):9157-60. doi: 10.1039/c5cc01836f.
Here we present a coumarin dimer (CD) mechanophore that, when embedded near the mid-chain of poly(methyl acrylate) polymers, activates under pulsed ultrasound conditions to yield coumarin chain-end functional polymers. Quantitative photochemical scission of the CD polymers provides a reference against which the activation efficiency of chain-centered mechanophores in polymers synthesized by controlled/living radical polymerization (CRP) can be assessed. Activation efficiency is characterized with respect to the polymer molecular weight (MW), polydispersity index (PDI), and distribution of mechanophores along the backbone.
在此，我们展示了一种香豆素二聚体（CD）机械响应基团，当它嵌入聚丙烯酸甲酯聚合物的链中附近时，在脉冲超声条件下会被激活，从而生成香豆素链端功能化聚合物。CD聚合物的定量光化学断裂提供了一个参考标准，据此可以评估通过可控/活性自由基聚合（CRP）合成的聚合物中链中心机械响应基团的激活效率。激活效率通过聚合物分子量（MW）、多分散指数（PDI）以及机械响应基团沿主链的分布来表征。
