Rigidity and fracture of biopolymer double networks
Rigidity and fracture of biopolymer double networks
复制标题
生物聚合物双网络的刚性和断裂
DOI：
10.1039/d1sm00802a
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发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
Das, Moumita
中科院分区：
文献类型：
--
作者：
Lwin, Pancy;Sindermann, Andrew;Sutter, Leo;Wyse Jackson, Thomas;Bonassar, Lawrence;Cohen, Itai;Das, Moumita
可调力学和抗断裂性是生物组织的标志，其性质来自由双网络组成的细胞外基质。为了阐明这些所需的属性的起源，我们研究的剪切模量和断裂性能的刚性双网络模型组成的刚性纤维的主要网络和柔性纤维的次要网络。我们发现，当初级网络密度刚好高于其刚性逾渗阈值时，次级网络密度可以被调整以通过非仿射变形促进应力松弛并提供机械增强。相比之下，当主网络远高于其刚度阈值时，双网络总是刚性和脆性的。这些结果强调了生物聚合物双网络可调性和弹性背后的一个重要机制：只有当初级网络稍微刚性时，次级网络才能将机械性能从柔顺和韧性急剧改变为刚性和脆性。
Tunable mechanics and fracture resistance are hallmarks of biological tissues whose properties arise from extracellular matrices comprised of double networks. To elucidate the origin of these desired properties, we study the shear modulus and fracture properties of a rigidly percolating double network model comprised of a primary network of stiff fibers and a secondary network of flexible fibers. We find that when the primary network density is just above its rigidity percolation threshold, the secondary network density can be tuned to facilitate stress relaxation via non-affine deformations and provide mechanical reinforcement. In contrast, when the primary network is far above its rigidity threshold, the double network is always stiff and brittle. These results highlight an important mechanism behind the tunability and resilience of biopolymer double networks: the secondary network can dramatically alter mechanical properties from compliant and ductile to stiff and brittle only when the primary network is marginally rigid.