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Collective and Single-Chain Correlations in Disordered Melts of Symmetric Diblock Copolymers: Quantitative Comparison of Simulations and Theory

机译:对称二嵌段共聚物无序熔体中的集体和单链关联:模拟和理论的定量比较

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摘要

We present a detailed comparison of simulations of disordered melts of symmetric AB diblock copolymers to predictions of the renormalized one-loop (ROL) theory. The behaviors of the structure factor S(q) and of single-chain correlations are studied over a range of chain lengths (N = 16, ..., 128) for two models: one with harshly repulsive pair interactions and another with very soft interactions. The ROL theory is shown to provide an excellent description of the dependence of S(q) on chain length and thermodynamic conditions for both models, even for very short chains, if we allow for the existence of a nonlinear dependence of the effective interaction parameter χ_e upon the strength of the AB repulsion. The decrease in peak wavenumber q* with increasing χ_e is shown to be unrelated to changes in single-chain correlations. Results for all quantities are consistent with the hypothesis that the ROL theory gives an exact description of the dominant O(N~(?1/2)) corrections to RPA and random-walk predictions in the limit of infinite chain length N.
机译:我们目前对对称AB双嵌段共聚物无序熔体的模拟进行仿真,以更正重环一环(ROL)理论的预测。在两个模型的一系列链长(N = 16,...,128)上研究了结构因子S(q)和单链相关性的行为:一个模型具有强烈的排斥对相互作用,另一个模型具有非常软的排斥对相互作用。互动。如果我们考虑有效相互作用参数χ_e的非线性相关性,那么ROL理论就可以很好地描述两个模型中S(q)对链长和热力学条件的依赖性,即使对于非常短的链条​​也是如此。根据AB排斥的强度。峰值波数q *随着χ_e的增加而减小,这与单链相关性的变化无关。所有数量的结果与以下假设一致:ROL理论给出了RPA的主要O(N〜(?1/2))校正的精确描述,以及在无限链长N的限制下的随机游走预测。

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