分子动力学模拟的界面结构和碳酸改性Al2O3和聚合物化物之间的亲和力
Takamasa Saito1, Masaki Kubo1, Takao Tsukada2
1Department of Chemical Engineering, Tohoku University, 6-6-07 Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
The Journal of chemical physics
|October 27, 2023
概括
纳米颗粒的表面修饰改善了聚合物纳米复合材料的性能. 分子动力学模拟显示,优化表面覆盖和修饰剂选择可增强纳米粒子-聚合物界面亲和力,这对于材料设计至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 聚合物科学 聚合物科学
背景情况:
- 控制聚合物矩阵中的纳米粒子分散对于制造先进的聚合物纳米复合材料至关重要.
- 纳米颗粒的表面修饰是提高它们在聚合物中的兼容性和分散性的关键策略.
- 分子动力学 (MD) 模拟为界面特性提供了宝贵的见解,有助于材料设计.
研究的目的:
- 研究表面覆盖面,修饰器长度和聚合物类型对聚合物融中的表面修饰Al2O3纳米颗粒的界面特性的影响.
- 使用粘附工作 (Wadh) 和沉浸工作 (Wimm) 来量化界面亲和力.
- 建立界面特性和聚合物-修饰剂相互作用之间的关系.
主要方法:
- 利用全原子分子动力学 (MD) 模拟来建模纳米粒子-聚合物接口.
- 使用的表面修饰剂:六酸,十酸和四酸.
- 研究的聚合物化物:聚烯 (PP),聚烯 (PS) 和聚甲基酸 (PMMA).
- 通过幻墙方法计算Wadh,并从Wadh和聚合物表面张力中得出Wimm.
主要成果:
- 表面修改,特别是在覆盖范围较低时,由于改善了聚合物透,显著增强了Wadh和Wimm.
- 修饰器长度对界面亲和力产生了很小的影响.
- 粘附工作 (Wadh) 遵循了PP < PS < PMMA的趋势,而沉浸工作 (Wimm) 显示了相反的趋势:PMMA < PS < PP.
- 界面亲和趋势与弗洛里-哈金斯相互作用参数 (χ) 成功相关.
结论:
- 聚合物纳米复合材料的界面亲和力可以通过调整纳米粒子表面覆盖和修饰剂选择来有效调整.
- 选择表面修饰剂及其与特定聚合物矩阵的相互作用对于优化纳米复合材料性能至关重要.
- MD模拟提供了一个强大的工具,用于预测和指导具有所需接口性质的材料的设计.
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