Brownian Dynamics Simulations of Telechelic Polymers Transitioning between Hydrophobic Surfaces

Brownian Dynamics Simulations of Telechelic Polymers Transitioning between Hydrophobic Surfaces
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疏水表面间遥爪聚合物转变的布朗动力学模拟

DOI:
10.1021/acs.macromol.1c01540
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发表时间:
2021
期刊:
影响因子:
5.5
通讯作者:
Larson, Ronald G.
Larson, Ronald G.
中科院分区:
化学1区
文献类型:
--
作者:
Travitz, Alyssa;Larson, Ronald G.

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我们使用布朗动力学(BD)模拟解决在一个库恩步骤的水平来计算的速率,在该速率与表面粘附端帽的遥爪聚合物从两个平面之间的桥梁过渡到一个单一的表面上的一个环。然后,我们使用自洽场理论,以获得平衡比率的桥回路和应用的详细平衡的原则,以获得较慢的环到桥的时间从较快的桥到环的时间。桥环过渡时间有两个缩放制度:一个是大约等于一个孤独的疏水颗粒从表面解吸的时间,和其他的地方,它是由聚合物的回缩时间占主导地位;两个时间的近似公式给出。这些结果对于解释乳胶涂料液的动力学和流变学非常重要,其中胶体颗粒通过遥爪流变改性聚合物动态桥接。
We use Brownian dynamics (BD) simulations resolved at the level of a Kuhn step to calculate the rate at which a telechelic polymer with surface-adhering endcaps transitions from a bridge between two flat surfaces to a loop on a single surface. We then use self-consistent field theory to obtain the equilibrium ratio of bridges to loops and apply the principle of detailed balance to obtain the slower loop-to-bridge times from the faster bridge-to-loop times. The bridge-to-loop transition time has two scaling regimes: one where it is approximately equal to the time for a lone hydrophobic particle to desorb from a surface, and the other where it is dominated by the retraction time of the polymer; approximate formulas for both times are given. The results are important for interpreting the dynamics and rheology of latex coating fluids, in which colloidal particles are dynamically bridged by telechelic rheology-modifying polymers.
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影响因子: 3.3
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