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重视水凝中应变诱导的软化行为

L K R Duarte^1,2, L G Rizzi¹

¹Departamento de Física, Universidade Federal de Viçosa (UFV), Av. P. H. Rolfs, s/n, 36570-900, Viçosa, Brazil. lerizzi@ufv.br.

|July 9, 2024

概括

水凝软化通常与网络损坏有关. 这项研究表明,聚合物-溶剂相互作用,而不仅仅是网络破裂,可以导致状凝的软化.

科学领域:

材料科学材料科学材料科学
聚合物物理聚合物物理
柔软的物质软的物质

背景情况:

压力诱导的水凝软化通常归因于网络结构断裂.
了解水凝机械行为背后的机制对于材料设计至关重要.

研究的目的:

调查压力诱导水凝软化的替代机制.
挑战网络断裂作为软化唯一原因的传统解释.

主要方法:

利用了从粗粒度模型中获得的应力-应变关系.
分析了与弹性模量有关的能量贡献.
将理论预测与各种水凝的实验数据进行比较.

主要成果:

证明网络断裂对于观察软化行为并非必不可少.
将差分模量 (K,T,γ) 的下降与与能源相关的贡献联系起来.
显示了聚合物-溶剂相互作用可以驱动软化.

结论:

水凝中的软化可能来自聚合物-溶剂相互作用,而不仅仅来自网络损伤.
拟议的模型为水凝力学提供了新的视角.
这些发现得到了四PEG水凝和其他实验数据的验证.

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