The effect of cross-link distributions in axially-ordered, cross-linked networks
The effect of cross-link distributions in axially-ordered, cross-linked networks
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DOI：
10.1088/0953-8984/25/28/285101
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发表时间：
2013-07-17
影响因子：
2.7
通讯作者：
Pandit, Sagar A.
中科院分区：
文献类型：
--
作者：
Bennett, C. Brad;Kruczek, James;Pandit, Sagar A.
生物聚合物的组成链之间的交联对其材料的性能有显著影响。在某些此类材料中，如纤维性胶原蛋白，交联的增加会导致熔化温度的升高。纤维性胶原蛋白是一种轴向有序的交联聚合物链网络，表现出变宽的变性转变，这可以用多物种随温度的连续变性来解释。我们将轴向有序的交联材料建模为具有不同交联形成位点排列的刚性链。模拟表明，由具有相同交联形成位点排列的链组成的系统表现出临界行为。相反，由不相同链组成的系统经历交叉。该模型表明，交联形成位点的排列可能有助于纤维性胶原变性转变的扩大。
Cross-linking between the constituent chains of biopolymers has a marked effect on their materials' properties. In certain of these materials, such as fibrillar collagen, increases in cross-linking lead to an increase in the melting temperature. Fibrillar collagen is an axially-ordered network of cross-linked polymer chains exhibiting a broadened denaturation transition, which has been explained in terms of the successive denaturation with temperature of multiple species. We model axially-ordered, cross-linked materials as stiff chains with distinct arrangements of cross-link-forming sites. Simulations suggest that systems composed of chains with identical arrangements of cross-link-forming sites exhibit critical behavior. In contrast, systems composed of non-identical chains undergo a crossover. This model suggests that the arrangement of cross-link-forming sites may contribute to the broadening of the denaturation transition in fibrillar collagen.