现实和in微凝在体积相位过渡的下方和上方显示了可比的批量模块
Tom Höfken1, Urs Gasser2, Stefanie Schneider1
1Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074, Aachen, Germany.
Macromolecular rapid communications
|April 13, 2024
概括
软合物压缩性是集中悬浮的关键. 微凝软度显著影响体积模量低于体积相位过渡温度 (VPTT),但不超过它.
科学领域:
- 软物质物理学 软物质物理学
- 聚合物科学 聚合物科学
- 体科学是关于体的科学.
背景情况:
- 颗粒的压缩性对于理解缩悬浮中的软合物行为至关重要.
- 散体模量 (K) 量化了颗粒的压缩性,特别是基于软聚合物的微凝.
- 在体积相转换温度 (VPTT) 下和以上,微凝表现出明显的特性.
研究的目的:
- 为了研究交联度 (软度) 对微凝可压缩性的影响.
- 为了确定压缩能力在VPTT下方和上方的变化.
- 对微凝悬浮剂的实验数据进行计算模型的验证.
主要方法:
- 使用了分子动力学模拟.
- 使用微角中子散射与对比度变化.
- 研究的微凝具有不同程度的交叉链接.
主要成果:
- 观察到粒子质量模块的两级变化.
- 发现交叉链接显著影响膨胀的微凝的体积模量.
- 确定在VPTT以上,散装模块变得在很大程度上独立于交叉连接密度.
结论:
- 微凝的压缩性高度依赖于交叉连接和相对于VPTT的温度.
- 模拟准确地复制真实聚合物网络的内部架构和弹性特性.
- 这项工作使密集的微凝悬浮在不同条件下的系统模拟研究成为可能.
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