Scale-Dependent Stiffness and Internal Tension of a Model Brush Polymer
Scale-Dependent Stiffness and Internal Tension of a Model Brush Polymer
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模型刷聚合物的与比例相关的刚度和内部张力
DOI：
10.1103/physrevlett.119.127801
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发表时间：
2017
影响因子：
8.6
通讯作者：
Saleh, Omar A.
中科院分区：
文献类型：
--
作者：
Berezney, John P.;Marciel, Amanda B.;Schroeder, Charles M.;Saleh, Omar A.
瓶刷聚合物表现出紧密接枝的侧链，其通过空间排斥相互作用，从而引起聚合物主链的硬化。我们使用模型刷聚合物的单分子弹性测量来量化这种效果。我们发现，硬化是唯一显着的长尺度，与主链保留灵活性短尺度。从弹性数据中，我们提取了侧链排斥产生的内部张力的估计，这一估计与基于斑点的标度理论的预测是一致的。
Bottle-brush polymers exhibit closely grafted side chains that interact by steric repulsion, thereby causing stiffening of the main polymer chain. We use single-molecule elasticity measurements of model brush polymers to quantify this effect. We find that stiffening is only significant on long length scales, with the main chain retaining flexibility on short scales. From the elasticity data, we extract an estimate of the internal tension generated by side-chain repulsion; this estimate is consistent with the predictions of blob-based scaling theories.