Linear Viscoelasticity of Weakly Hydrogen-Bonded Polymers near and below the Sol–Gel Transition,Macromolecules

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Linear Viscoelasticity of Weakly Hydrogen-Bonded Polymers near and below the Sol–Gel Transition
Macromolecules ( IF 5.1 ) Pub Date : 2018-06-27 00:00:00 , DOI: 10.1021/acs.macromol.8b00772
Milad Golkaram ₁ , Csaba Fodor ₁ , Evelyne van Ruymbeke ₂ , Katja Loos ₁

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Supramolecular polymers bearing weak hydrogen bonds (sticker) can express outstanding dynamic properties due to their labile association. Studying the linear viscoelasticity (LVE) of this type of polymer can provide us with sufficient knowledge to design polymeric materials for applications that need dynamic properties such as self-healing. Using different compositions of flexible weak stickers, LVE analysis showed scalings corresponding to a transition from a linear precursor to a cluster. By introducing one sticker per repeating unit of the precursor polymer, the effect of sticker distribution along the chain as well as phase separation is excluded. However, even a fully functionalized polymer could not show any network formation, whereas surprisingly, a stable cluster was formed. This proves that weakly associated networks do not dissociate rapidly and can relax as a cluster at extended time before the dissociation of stickers can lead to the relaxation of linear analogous (slow kinetics similar to strong physical or even chemical bonds.) On the other hand, the absence of a gel even in fully sticker-functionalized polymers shows that the weakness of these polymers can be described as their weakness in complete association (thermodynamically not favored).

中文翻译：

弱氢键聚合物在溶胶-凝胶转变附近和之下的线性粘弹性

带有弱氢键（粘性）的超分子聚合物由于其不稳定的缔合而可以表现出出色的动力学性能。研究此类聚合物的线性粘弹性（LVE）可以为我们提供足够的知识，以设计用于需要动态特性（例如自愈）的应用的聚合物材料。使用不同组成的柔性弱标签，LVE分析显示出与从线性前体到团簇的转变相对应的结垢。通过在前体聚合物的每个重复单元中引入一个标签，可以排除标签沿链分布以及相分离的影响。但是，即使是完全官能化的聚合物也无法显示任何网络形成，而令人惊讶的是，形成了稳定的簇。

更新日期：2018-06-27

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