Non-affine deformations in polymer hydrogels.
Non-affine deformations in polymer hydrogels.
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DOI：
10.1039/c2sm25364j
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发表时间：
2012-01-01
期刊：
影响因子：
3.4
通讯作者：
Yodh AG
中科院分区：
文献类型：
--
作者：
Wen Q;Basu A;Janmey PA;Yodh AG
大多数软物质弹性理论假定试样变形后的局部应变处处相同，且与宏观应变相等，或者等效地假定变形是仿射的。我们讨论了交联聚合物水凝胶的弹性，特别关注了弹性的仿射和非仿射理论。还描述了测量非仿射变形的实验程序。熵理论是基于拉伸单个聚合物链来解释凝胶弹性的，它预测了仿射变形。相反，网络变形的模拟，导致弯曲的刚性组成细丝通常预测非仿射行为。实验结果表明，水凝胶中存在显著的非仿射变形，即使它们是由柔性聚合物形成的，与拉伸相比，弯曲似乎可以忽略不计。然而，这一发现并不一定是弹性的非仿射模型的实验证明。我们强调从共聚焦流变镜实验中获得的见解，并表明，除了灯丝弯曲外，样品微不均匀性可能是非仿射变形的重要替代来源。
Most theories of soft matter elasticity assume that the local strain in a sample after deformation is identical everywhere and equal to the macroscopic strain, or equivalently that the deformation is affine. We discuss the elasticity of hydrogels of crosslinked polymers with special attention to affine and non-affine theories of elasticity. Experimental procedures to measure non-affine deformations are also described. Entropic theories, which account for gel elasticity based on stretching out individual polymer chains, predict affine deformations. In contrast, simulations of network deformation that result in bending of the stiff constituent filaments generally predict non-affine behavior. Results from experiments show significant non-affine deformation in hydrogels even when they are formed by flexible polymers for which bending would appear to be negligible compared to stretching. However, this finding is not necessarily an experimental proof of the non-affine model for elasticity. We emphasize the insights gained from experiments using confocal rheoscope and show that, in addition to filament bending, sample micro-inhomogeneity can be a significant alternative source of non-affine deformation.
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影响因子：
10.8
作者：
DONG, LC;HOFFMAN, AS
通讯作者：
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DOI：
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发表时间：
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作者：
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