Sticker Multivalency in Metallo-supramolecular Polymer Networks,Macromolecules

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Sticker Multivalency in Metallo-supramolecular Polymer Networks
Macromolecules ( IF 5.1 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.macromol.1c01201
Katharina Breul ₁ , Sebastian Kissel ₁ , Sebastian Seiffert ₁

Affiliation

Multivalency is a key concept in the supramolecular science; it allows an additive or even synergetic enhancement of association constants without the need to replace the basic binding motif. To understand the effects of multivalent binding on the mechanical and dynamic properties of metallo-supramolecular polymer gels, we investigate the concentration- and association strength-dependent linear viscoelasticity of two model systems in the semidilute regime, which are based on either telechelic star-poly(ethylene glycol)s (pEGs) or linear multiblock polyurethanes (PUs) with isolated, monotopic, or adjacent, ditopic terpyridine stickers. In the homogeneous star-pEG gels, the ditopic stickers increase the network strength at identical cross-linker concentrations through the formation of higher functional cross-linking junctions, whereas the mechanical enforcement of the partially clustered PU gels is less-pronounced. The ditopic stickers slow down the dynamics of both gel types to a similar extent by increasing the number of sticker-opening attempts required for network relaxation.

中文翻译：

金属超分子聚合物网络中的多价性

多价性是超分子科学中的一个关键概念；它允许结合常数的附加甚至协同增强，而无需替换基本结合基序。为了了解多价结合对金属超分子聚合物凝胶的机械和动力学特性的影响，我们研究了半稀释状态下两个模型系统的浓度和缔合强度依赖性线性粘弹性，这些系统基于遥爪星-聚(乙二醇)s (pEGs) 或线性多嵌段聚氨酯 (PUs) 具有孤立的、单位的或相邻的双位三联吡啶贴纸。在均质星形 pEG 凝胶中，双位粘着剂在相同交联剂浓度下通过形成更高功能的交联点来增加网络强度，而部分成簇的 PU 凝胶的机械强化则不太明显。双主题贴纸通过增加网络松弛所需的贴纸打开尝试次数，在相似程度上减慢了两种凝胶类型的动态。

更新日期：2021-09-28

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