开发一个粗粒度的分子动力学模型,用于聚二甲基--二) .
Weikang Xian1, Amitesh Maiti2, Andrew P Saab2
1Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706-1572, USA. yli2562@wisc.edu.
Soft matter
|October 15, 2024
概括
我们开发了一种粗粒度的分子动力学模型来模拟聚二甲基酸共聚合物. 这个模型准确地捕捉了结构和动态特性,使得更大规模的研究成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
- 聚合物物理 聚合物物理
背景情况:
- 聚甲基 (PDMS) 是一种多用途的聚合物,但低温会导致结晶,改变其性能.
- 作为聚-二甲基-共-二甲基) 的基合物,抑制了这种结晶.
- 全原子分子动力学 (AAMD) 对于在相关的长度和时间尺度上研究PDMS是有限的.
研究的目的:
- 开发一个粗粒度分子动力学 (CGMD) 模型,用于聚二甲基-co-diphenyl) .
- 为了在延长长度和时间尺度上实现PDMS共聚合物的模拟.
- 准确预测PDMS共聚物的结构和动态特性.
主要方法:
- 系统地开发CGMD模型用于聚二甲基-co-diphenyl-siloxane.
- 使用从AAMD的代博尔兹曼逆转 (IBI) 来确定绑定和非绑定相互作用.
- 关于制造非绑定潜力的杆规则的建议.
主要成果:
- 该CGMD模型从数量上捕获了共聚物体的结构和动态特性.
- 该模型成功地抑制了在低温下在PDMS中观察到的结晶效应.
- 开发的模型将模拟能力扩展到更长的时间尺度和更大的系统.
结论:
- 开发的CGMD模型为研究PDMS共聚合物提供了一种计算效率高,准确的方法.
- 这种方法对于研究纠聚合物系统中的长时间动态,序列依赖性质和相位行为是有价值的.
- 杆规则为CGMD模拟中的潜在生成提供了一种新的方法.
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