聚合物凝的超性和体积相变
Andrea Ninarello1,2, Emanuela Zaccarelli1,2
1CNR Institute of Complex Systems, Uos Sapienza, Piazzale Aldo Moro 2, 00185, Roma, Italy. andrea.ninarello@cnr.it.
Soft matter
|June 2, 2025
概括
热反应性水凝表现出不同的过渡:体积相过渡 (VPT) 和超氧化过渡 (HAT). 基于交叉连接剂度的不同温度发生的HAT,为水凝力学提供了新的见解.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 软物质物理学 软物质物理学
背景情况:
- 热反应性水凝经历体积相转换 (VPT),具有独特的机械性能.
- 在低交叉连接的水凝中,在低温度下观察到一种以 -1 的波桑比率 (ν) 为特征的超氧过渡 (HAT).
研究的目的:
- 为了研究体积相转换 (VPT) 和热敏水凝中的超性转换 (HAT) 之间的关系.
- 阐明交叉连接器度对这些明显过渡的影响.
主要方法:
- 广泛的数值模拟被用来模拟水凝的行为.
- 分析的重点是Poisson比率 (ν) 和其与温度和交叉连接器度的相关性.
主要成果:
- 超氧化过渡 (HAT) 发生在取决于交叉连接器度 (c) 的温度下.
- HAT与体积相转换 (VPT) 不同,体积相转换发生在固定的温度下,不论交叉连接器度如何.
- 在低交叉连接的水凝中,HAT伴随着一种类似临界的行为.
结论:
- 该研究表明,HAT和VPT是热敏水凝中的单独现象.
- 结果提供了对网络崩和这些材料的机械特性,特别是Poisson比率之间的相互作用的基本见解.
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