Cavitation and fracture behavior of polyacrylamide hydrogels
Cavitation and fracture behavior of polyacrylamide hydrogels
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DOI：
10.1039/b909237d
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发表时间：
2009-01-01
期刊：
影响因子：
3.4
通讯作者：
Crosby, Alfred J.
中科院分区：
文献类型：
--
作者：
Kundu, Santanu;Crosby, Alfred J.
凝胶的机械性能呈现出定性的矛盾行为；它们通常是软的，但也是出了名的易碎。我们使用一种简单的实验方法来研究膨胀的聚合物网络的弹性和断裂行为，以诱导凝胶中的空化，并采用标度理论来捕捉观察到的从可逆变形到不可逆变形的转变作为聚合物体积分数的函数。定量地表明，从可逆空化到不可逆断裂的转变取决于聚合物的体积分数和初始缺陷长度尺度。利用空化实验可以表征从毫米到毫米的长度范围内的网络特性。我们预计，这些结果可能会显著提高对软材料的机械性能的理解，无论是合成材料还是生物材料。
The mechanical properties of gels present qualitatively contradictory behavior; they are commonly soft but also notoriously brittle. We investigate the elasticity and fracture behavior of swollen polymer networks using a simple experimental method to induce cavitation within a gel and adapt scaling theories to capture the observed transition from reversible to irreversible deformations as a function of polymer volume fraction. It is shown quantitatively that the transition from reversible cavitation to irreversible fracture depends on the polymer volume fraction and an initial defect length scale. The use of cavitation experiments permits characterization of network properties across length scales ranging from mm to mm. We anticipate that these results may significantly enhance the understanding of mechanical properties of soft materials, both synthetic and biological.