关于玻璃聚合物凝的非菲克扩散和异常膨胀的统一模型
Peihan Lyu1, Zhaoyu Ding1, Masao Doi1,2
1School of Physics, Beihang University, Beijing 100191, China.
ACS macro letters
|April 9, 2024
概括
玻璃状聚合物表现出独特的胀行为,如Case II扩散和非单调的胀. 一个新的理论通过将聚合物模拟为粘弹性凝来解释这些异常,为溶剂透和膨胀动态提供可测试的预测.
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
- 物理化学 物理化学
背景情况:
- 与和凝等软聚合物相比,玻璃状聚合物表现出明显的胀行为.
- 异常现象包括Case II扩散,其特点是利的溶剂透前线,以及非单调的胀,样品厚度最初增加,然后减少.
研究的目的:
- 开发一个理论框架来解释玻璃聚合物的异常膨胀行为.
- 扩展现有的软凝膨胀理论,以适应玻璃聚合物特性.
主要方法:
- 将玻璃状聚合物-溶剂系统建模为连续性混合物.
- 将聚合物网络处理为粘弹性凝,具有取决于溶剂的放松时间.
主要成果:
- 提出的理论成功地以统一的方式解释了Case II扩散和非单调的胀.
- 该理论为理解粘性弹性,溶剂度和扩散动态之间的相互作用提供了一个框架.
结论:
- 粘弹性凝模型为异常玻璃聚合物胀提供了强有力的解释.
- 该理论产生了实验验证的关于透速度和膨胀时间尺度的预测,这取决于材料的特性和条件.
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