交联环状聚合物超拉伸弹性体
Super-stretchable Elastomer from Cross-linked Ring Polymers
摘要：
聚合物材料的可拉伸性对于许多应用例如可拉伸电子器件和软机器人来说是至关重要的，然而常规交联线性聚合物的可拉伸性受到聚合物链之间的缠结的限制。我们使用分子动力学模拟，交联环聚合物是显着更可拉伸的交联线性聚合物。与线性聚合物相比，环状聚合物之间的缠结不起有效交联的作用。因此，交联环聚合物的拉伸性由交联之间的聚合物链的最大延伸决定，而不是如交联线性聚合物中那样由缠结之间的聚合物链的最大延伸决定。环聚合物在变形之前的更紧密的构象也有助于拉伸性的增加。
英文摘要：
The stretchability of polymeric materials is critical to many applications such as stretchable electronics and soft robotics, yet the stretchability of conventional cross-linked linear polymers is limited by the entanglements between polymer chains. We show using molecular dynamics simulations that cross-linked ring polymers are significantly more stretchable than cross-linked linear polymers. Compared to linear polymers, the entanglements between ring polymers do not act as effective cross-links. As a result, the stretchability of cross-linked ring polymers is determined by the maximum extension of polymer strands between cross-links, rather than between entanglements as in cross-linked linear polymers. The more compact conformation of ring polymers before deformation also contributes to the increase in stretchability.
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