Threading-Induced Dynamical Transition in Tadpole-Shaped Polymers,ACS Macro Letters

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Threading-Induced Dynamical Transition in Tadpole-Shaped Polymers
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-05-05 , DOI: 10.1021/acsmacrolett.0c00197
Angelo Rosa ₁ , Jan Smrek ₂ , Matthew S Turner _{3,

4} , Davide Michieletto _{5,

6,

7}

Affiliation

The relationship between polymer topology and bulk rheology remains a key question in soft matter physics. Architecture-specific constraints (or threadings) are thought to control the dynamics of ring polymers in ring–linear blends, which thus affects the viscosity to range between that of the pure rings and a value larger, but still comparable to, that of the pure linear melt. Here we consider qualitatively different systems of linear and ring polymers, fused together in “chimeric” architectures. The simplest example of this family is a “tadpole”-shaped polymer, a single ring fused to the end of a single linear chain. We show that polymers with this architecture display a threading-induced dynamical transition that substantially slows chain relaxation. Our findings shed light on how threadings control dynamics and may inform design principles for chimeric polymers with topologically tunable bulk rheological properties.

中文翻译：

蝌蚪形聚合物中的螺纹诱导动态转变

聚合物拓扑结构与本体流变学之间的关系仍然是软物质物理学中的一个关键问题。特定结构的约束（或螺纹）被认为可以控制环状线性共混物中环聚合物的动力学，从而影响粘度在纯环的粘度和更大的值之间的范围，但仍与纯环的粘度相当。线性熔化。在这里，我们考虑以“嵌合”结构融合在一起的线性和环状聚合物的性质不同的系统。该家族最简单的例子是“蝌蚪”形聚合物，是一个稠合到单个线性链末端的单环。我们表明，具有这种结构的聚合物表现出线程诱导的动态转变，大大减缓了链松弛。我们的研究结果揭示了螺纹如何控制动力学，并可能为具有拓扑可调的整体流变特性的嵌合聚合物的设计原理提供信息。

更新日期：2020-05-05

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