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聚烯融中的下支部恢复:化对重复剪切启动的影响
Benke Li1,2, Dimitris Vlassopoulos1,3
1Institute of Electronic Structure and Laser, FORTH, Heraklion 70013, Greece.
The journal of physical chemistry. B
|December 29, 2025
概括
纠的聚合物融显示了剪切启动后的应力下射. 这些下拉线仅在长时间的休息后才会再次出现,这表明聚合物动态中的持久记忆效应.
科学领域:
- 聚合物物理 聚合物物理
- 类风病学 类风病学 类风病学
- 材料科学 材料科学 材料科学
背景情况:
- 纠的聚合物融在剪切启动过程中表现出暂时的应力下射,这是初始超射后的现象.
- 底叶的微观起源是有争议的,但有证据将其与聚合物链动力学联系起来.
- 伊安尼鲁伯托-马鲁奇 (IM) 模型为理解链及其在非线性聚合物学中的作用提供了一个框架.
研究的目的:
- 系统地调查聚乙烯融体在纠过渡过程中的超射和低射行为.
- 将实验数据与Ianniruberto-Marrucci (IM) 模型的预测进行比较.
- 为了探测重复剪切启动后应力下部的演变,具有不同的回火时间.
主要方法:
- 对聚乙烯融的实验具有不同的纠密度 (1.8到16.7).
- 在剪切启动测试中使用了模块化的圆分区板 (CPP) 几何.
- 应用重复的剪切启动协议,在测试之间增加回火时间.
主要成果:
- 观察到压力下叶子只有在意外长的回火时间 (在WiR ≥10时) 后才会重新出现.
- 这种重新出现凸显了聚合物融中持续存在的结构记忆效应.
- 调查结果提供了对细分重定位及其对下拉板复苏的影响的见解.
结论:
- 聚合物化物长时间保持结构记忆,影响非线性质反应.
- 该研究有助于理解和改进非线性聚合物动态的构成模型.
- 细分重定位在压力下拉现象的恢复中起着至关重要的作用.
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