深度学习的原子间潜力将分子结构排序与多烯二的宏观性质联系起来
Rajni Chahal1, Michael D Toomey1, Logan T Kearney1
1Chemical Science Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee 37830, United States.
ACS applied materials & interfaces
|July 3, 2024
概括
在小规模数据上训练的神经网络原子间潜力 (NNIP) 可以准确地预测大规模的聚烯二 (PAN) 聚合物结构和特性. 这一突破使PAN和类似材料的结构属性关系的成本效益和准确预测成为可能.
科学领域:
- 聚合物科学 聚合物科学
- 计算化学计算化学
- 材料科学 材料科学 材料科学
背景情况:
- 聚烯二 (PAN) 是一种具有无动态立体化学的重要商用聚合物.
- 了解PAN的分子相互作用对于优化产品设计和降低加工成本至关重要.
- 传统的初始分子动力学 (AIMD) 是准确的,但仅限于小分子,阻碍了大规模的聚合物分析.
研究的目的:
- 开发一种可扩展的计算方法来分析大规模的聚合物结构和特性.
- 调查分子相互作用对PAN散体结构和机械性能的影响.
- 确定PAN和相关聚合物的精确结构-性质关系.
主要方法:
- 在 PAN 寡合体的小规模 AIMD 数据上训练神经网络原子间潜力 (NNIP).
- 采用NNIP进行无形散装PAN的大规模模拟.
- 验证NNIP预测的结构与实验X射线结构因子数据对比.
- 将预测的特性 (密度,弹性模量) 与实验值进行比较.
主要成果:
- NNIPs成功地预测了无形散装PAN结构,捕捉了链内和链间的结和双极相关性.
- 预测密度和弹性模量与实验数据一致.
- 在弹性模量和PAN结构定向 (赫曼斯定向因子) 之间观察到强烈的相关性.
结论:
- NNIP提供了一个计算效率高,准确的方法来模拟大规模的聚合物系统.
- 这种方法为聚合物结构与性质关系提供了关键的见解.
- 这项研究为在各种尺度上预测PAN和类似聚合物的性能提供了可持续的,初始准确性的基础.
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