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首页> 外文期刊>The Journal of Chemical Physics >Kinetics of phase separation in polymer mixtures: A molecular dynamics study
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Kinetics of phase separation in polymer mixtures: A molecular dynamics study

机译:聚合物混合物中相分离的动力学:分子动力学研究

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摘要

We present detailed results from a molecular dynamics (MD) simulation of phase-separation kinetics in polymer mixtures. Our MD simulations naturally incorporate hydrodynamic effects. We find that polymeric phase separation (with dynamically symmetric components) is in the same universality class as segregation of simple fluids: the degree of polymerization only slows down the segregation kinetics. For d = 2 polymeric fluids, the domain growth law is L(t) ~ t~φ with φ showing a crossover from 1/3 → 1/2 → 2/3. For d = 3 polymeric fluids, we see the crossover φ = 1/3 → 1. Our MD simulations do not yet access the inertial hydrodynamic regime (with L ~ t~(2/3)) of phase separation in 3-d fluids.
机译:我们提出了分子动力学(MD)模拟聚合物混合物中相分离动力学的详细结果。我们的MD模拟自然包含了流体动力效应。我们发现,聚合物相分离(具有动态对称的组分)与简单流体的分离具有相同的通用性:聚合度只会减慢分离动力学。对于d = 2的聚合物流体,其畴长增长规律为L(t)〜t〜φ,其中φ显示出从1/3→1/2→2/3的交点。对于d = 3的聚合物流体,我们看到交叉点φ= 1/3→1。我们的MD模拟尚未获得3-d流体中相分离的惯性流体力学状态(L〜t〜(2/3))。 。

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