Dynamics of Associative Polymers with High Density of Reversible Bonds,Physical Review Letters

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Dynamics of Associative Polymers with High Density of Reversible Bonds
Physical Review Letters ( IF 8.1 ) Pub Date : 2023-05-31 , DOI: 10.1103/physrevlett.130.228101
Shifeng Nian ₁ , Shalin Patil ₂ , Siteng Zhang ₃ , Myoeum Kim ₁ , Quan Chen ₄ , Mikhail Zhernenkov ₅ , Ting Ge ₃ , Shiwang Cheng ₂ , Li-Heng Cai _{1,

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Affiliation

An associative polymer carries many stickers that can form reversible associations. For more than 30 years, the understanding has been that reversible associations change the shape of linear viscoelastic spectra by adding a rubbery plateau in the intermediate frequency range, at which associations have not yet relaxed and thus effectively act as crosslinks. Here, we design and synthesize new classes of unentangled associative polymers carrying unprecedentedly high fractions of stickers, up to eight per Kuhn segment, that can form strong pairwise hydrogen bonding of

\sim 20 k_{B} T

without microphase separation. We experimentally show that reversible bonds significantly slow down the polymer dynamics but nearly do not change the shape of linear viscoelastic spectra. This behavior can be explained by a renormalized Rouse model that highlights an unexpected influence of reversible bonds on the structural relaxation of associative polymers.

中文翻译：

高密度可逆键缔合聚合物的动力学

缔合聚合物带有许多可以形成可逆缔合的贴纸。30多年来，人们一直认为可逆缔合通过在中频范围内添加橡胶平台来改变线性粘弹性谱的形状，在此范围内缔合尚未松弛，从而有效地充当交联。在这里，我们设计并合成了新型非缠结缔合聚合物，其带有前所未有的高比例贴纸，每个库恩片段多达八个，可以形成强的成对氢键