Li et al.: Dynamics of entangled metallosupramolecular polymer networks combining stickers with different lifetimes

IF 3 2区工程技术 Q2 MECHANICS

Journal of Rheology Pub Date : 2022-11-01 DOI:10.1122/8.0000568

Yanzhao Li, Christina Pyromali, Flanco Zhuge, C. Fustin, J. Gohy, D. Vlassopoulos, E. van Ruymbeke

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引用次数: 7

Abstract

We study the linear viscoelastic properties of polymeric networks formed by poly( n-butyl acrylate) telechelic stars end-capped with 2,2:6,2″-terpyridine (Star-PnBA-tpy4) and two types of metal-ligand cross-links with different lifetimes. The influence of interactions, mediated by temperature, nature of metal ions, and ion content, on the linear viscoelastic behavior of both single and double dynamics transient networks is systematically investigated by small amplitude oscillatory shear and creep rheometry. The experimental results reveal that the dynamics of networks with two different metal-ligand cross-links is much faster than expected, characterized by the average sticker lifetime rather than a discrete contribution of each metal-ligand complex. We model the dynamics with the help of our modified tube-based time marching algorithm by accounting for both association/dissociation dynamics of metal-ligand coordination and the entanglement dynamics. Two parameters are defined in the model, namely, the proportion of dangling ends and the average time during which a sticker is free. This allows us to quantify the transient dynamics of the network and, in particular, to determine how the sticker dynamics depend on temperature and ion content.

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Li etal .:结合不同寿命贴纸的纠缠金属超分子聚合物网络的动力学

我们研究了由2,2:6,2〃-联吡啶（Star-PnBA-tpy4）封端的聚（丙烯酸正丁酯）遥爪星和两种不同寿命的金属配体交联形成的聚合物网络的线性粘弹性性质。通过小振幅振荡剪切和蠕变流变仪，系统地研究了由温度、金属离子性质和离子含量介导的相互作用对单动态和双动态瞬态网络的线性粘弹性行为的影响。实验结果表明，具有两种不同金属-配体交联的网络的动力学比预期的要快得多，其特征是平均贴纸寿命，而不是每个金属-配体复合物的离散贡献。我们通过考虑金属-配体配位的缔合/离解动力学和纠缠动力学，借助于我们改进的基于管的时间推进算法对动力学进行建模。模型中定义了两个参数，即悬挂末端的比例和贴纸空闲的平均时间。这使我们能够量化网络的瞬态动力学，特别是确定贴纸动力学如何取决于温度和离子含量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Rheology 物理-力学

CiteScore

6.60

自引率

12.10%

发文量

100

审稿时长

1 months

期刊介绍： The Journal of Rheology, formerly the Transactions of The Society of Rheology, is published six times per year by The Society of Rheology, a member society of the American Institute of Physics, through AIP Publishing. It provides in-depth interdisciplinary coverage of theoretical and experimental issues drawn from industry and academia. The Journal of Rheology is published for professionals and students in chemistry, physics, engineering, material science, and mathematics.