聚合物分散液晶的相位行为,平均场理论和粗粒度分子动力学模拟之间的比较
William S Fall1,2, Hima Bindu Kolli3, Biswaroop Mukherjee1
1Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, UK. b.chakrabarti@sheffield.ac.uk.
Soft matter
|September 23, 2024
概括
我们开发了一种模拟方法来预测聚合物混合物相位图. 这种方法揭示了一种新的稳定型性-A相,在寡合体和棒状中位素的混合物中.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 计算化学计算化学
背景情况:
- 预测聚合物混合物的热力学行为对于材料设计至关重要.
- 在具有方向对称性的系统中理解相变是复杂的.
- 现有的模拟方法可能会与复杂的分子相互作用作斗争.
研究的目的:
- 开发一种定量模拟方法来预测聚合物混合物相位图.
- 为了研究含有寡合物和中聚物的二元混合物的相位行为.
- 为了识别和描述新的液晶相.
主要方法:
- 使用粗粒度分子动力学 (CGMD) 模拟.
- 从组件概率分布推断出自由能量景观拓.
- 采用了聚合物分散液晶 (PDLC) 的平均场自由能量模型.
主要成果:
- 成功预测了聚合物混合物的温度依赖相位图.
- 观测到同位素 (I),阴性 (N) 和一种新的稳定型性-A (Sm-A) 阶段.
- 在CGMD模拟和中场相图之间证明一致.
结论:
- 拟议的模拟方法准确预测热力学行为和相位图.
- 该研究在特定的聚合物混合物中发现了一种新的稳定的Sm-A阶段.
- 这种方法适用于各种表现出相分离和导向性的合成和生物大分子.
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