Interplay between entanglement and crosslinking in determining mechanical behaviors of polymer networks
Interplay between entanglement and crosslinking in determining mechanical behaviors of polymer networks
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DOI：
10.1080/19475411.2023.2261777
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发表时间：
2023-09
影响因子：
3.9
通讯作者：
Yuhao Liu;Weikang Xian;Jinlong He;Ying Li
中科院分区：
文献类型：
--
作者：
Yuhao Liu;Weikang Xian;Jinlong He;Ying Li
摘要在聚合物物理中，纠缠的概念是指紧密堆积在一起的长聚合物链之间的拓扑约束。理论和实验都表明，纠缠对聚合物的力学性能有很大影响。这表明了它在各种应用中进行材料设计的前景。然而，理解纠缠和力学性质之间的关系是复杂的，特别是由于与长度尺度限制相关的挑战和直接实验观察的困难。这项研究深入探讨了聚合物网络结构在变形时的变化。我们具体研究了纠缠、交联网络之间的关系，以及它们在拉伸纠缠和非纠缠聚合物系统中的作用。对于非缠结聚合物，我们的发现强调了交联键强度在决定体系的整体强度和抗变形能力方面的关键作用。对于缠绕聚合物，在拉伸初期，缠结在承载中起着关键作用，保持了聚合物网络的完整性。随着拉伸的继续和缠结的减少，承担负荷的责任越来越多地转移到交联网络上，这意味着系统行为的关键变化。我们注意到，在最初的拉伸阶段，纠缠的增加与拉应力的增加之间存在线性关系。相反，网络的破坏与后期拉应力的降低相关。这些发现为了解聚合物网络拉伸过程中缠结和交联之间的复杂动力学提供了重要的见解，为未来聚合物材料的操作和设计提供了有价值的指导，以实现所需的力学性能。图形摘要
ABSTRACT In polymer physics, the concept of entanglement refers to the topological constraints between long polymer chains that are closely packed together. Both theory and experimentation suggest that entanglement has a significant influence on the mechanical properties of polymers. This indicates its promise for materials design across various applications. However, understanding the relationship between entanglement and mechanical properties is complex, especially due to challenges related to length scale constraints and the difficulties of direct experimental observation. This research delves into how the polymer network structure changes when deformed. We specifically examine the relationship between entanglement, crosslinked networks, and their roles in stretching both entangled and unentangled polymer systems. For unentangled polymers, our findings underscore the pivotal role of crosslinking bond strength in determining the system’s overall strength and resistance to deformation. As for entangled polymers, entanglement plays a pivotal role in load bearing during the initial stretching stage, preserving the integrity of the polymer network. As the stretching continues and entanglement diminishes, the responsibility for bearing the load increasingly shifts to the crosslinking network, signifying a critical change in the system’s behavior. We noted a linear correlation between the increase in entanglement and the rise in tensile stress during the initial stretching stage. Conversely, the destruction of the network correlates with a decrease in tensile stress in the later stage. The findings provide vital insights into the complex dynamics between entanglement and crosslinking in the stretching processes of polymer networks, offering valuable guidance for future manipulation and design of polymer materials to achieve desired mechanical properties. GRAPHICAL ABSTRACT