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首页> 外文期刊>The European physical journal, E. Soft matter >Monte Carlo phase diagram for diblock copolymer melts
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Monte Carlo phase diagram for diblock copolymer melts

机译:二嵌段共聚物熔体的蒙特卡洛相图

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The phase diagram for diblock copolymer melts is evaluated from lattice-based Monte Carlo simulations using parallel tempering, improving upon earlier simulations that used sequential temperature scans. This new approach locates the order-disorder transition (ODT) far more accurately by the occurrence of a sharp spike in the heat capacity. The present study also performs a more thorough investigation of finite-size effects, which reveals that the gyroid (G) morphology spontaneously forms in place of the perforated-lamellar (PL) phase identified in the earlier study. Nevertheless, there still remains a small region where the PL phase appears to be stable. Interestingly, the lamellar (L) phase next to this region exhibits a small population of transient perforations, which may explain previous scattering experiments suggesting a modulated-lamellar (ML) phase.
机译:使用基于平行回火的基于晶格的蒙特卡洛模拟评估了二嵌段共聚物熔体的相图,与之前使用顺序温度扫描的模拟相比,该模拟得到了改进。这种新方法通过热容尖峰的出现,可以更准确地定位有序-无序转变(ODT)。本研究还对有限大小的影响进行了更彻底的研究,它揭示了自发形成了螺旋状(G)形态,代替了先前研究中确定的穿孔层(PL)相。但是,仍然存在一个很小的区域,PL相位看起来很稳定。有趣的是,该区域旁边的层状(L)相表现出少量的瞬时穿孔,这可以解释以前的散射实验,表明调制层状(ML)相。

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