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Chemically identical gels I – under-crosslinked networks
Journal of the Mechanics and Physics of Solids ( IF 5.3 ) Pub Date : 2023-03-24 , DOI: 10.1016/j.jmps.2023.105278
Xingjian Sun, Ping Rao, Xitao He, Canhui Yang, Wei Hong

Do materials prepared from identical compositions of constituting ingredients always exhibit similar mechanical properties? The answer is negative for most structural materials, as has been demonstrated by extensive studies on various factors such as the effects of processing and microstructures. However, the same question has seldom been addressed in the case of polymeric gels. In this work, by using a simple chemically crosslinked hydrogel as a model system, the mechanical properties, including elastic stiffness, fracture toughness, and fatigue threshold, of gels with identical chemical compositions are systematically investigated. The distinct material properties are then rationalized and quantitatively correlated to synthesis conditions and manufacture processes through scaling laws derived from basic physics. Different scaling laws are identified between samples prepared from swelling and deswelling. Extreme mechanical properties, such as the remarkable fracture energy of hydrogels prepared by deswelling from highly swollen samples, are observed and attributed to the structural characteristics of the polymer network, and further correlated to the synthesis processes. This study provides insights into the synthesis-property correlations of polymeric gels, which may have profound influences on the design of new polymeric materials and their applications in various fields.



中文翻译:

化学性质相同的凝胶 I – 欠交联网络

由相同组成成分制成的材料是否总是表现出相似的机械性能?对于大多数结构材料而言,答案是否定的,正如对加工和微观结构的影响等各种因素的广泛研究所证明的那样。然而,在聚合物凝胶的情况下,很少解决同样的问题。在这项工作中,通过使用简单的化学交联水凝胶作为模型系统,力学性能,包括弹性刚度、断裂韧性和疲劳阈值,具有相同化学成分的凝胶进行了系统研究。然后通过源自基础物理学的比例定律将不同的材料特性合理化并与合成条件和制造过程定量关联。在从溶胀和消溶胀制备的样品之间确定了不同的比例定律。极端的机械性能,例如显着的断裂能通过从高度溶胀的样品中消溶胀制备的水凝胶,观察到并归因于聚合物网络的结构特征,并进一步与合成过程相关。这项研究提供了对聚合物凝胶的合成-性能相关性的见解,这可能对新型聚合物材料的设计及其在各个领域的应用产生深远影响。

更新日期:2023-03-24
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