Dynamic Contributions to the Bulk Mechanical Properties of Self-Assembled Polymer Networks with Reconfigurable Bonds.,Macromolecular Rapid Communications

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Dynamic Contributions to the Bulk Mechanical Properties of Self-Assembled Polymer Networks with Reconfigurable Bonds.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2019-12-26 , DOI: 10.1002/marc.201900551
Xiaomin Tang ₁ , Bingqing Wang ₁ , Sophia Eristoff ₁ , Han Zhang _{1,

2} , Christopher J Bettinger _{1,

2}

Affiliation

Soft materials that contain dynamic and reversible bonds exhibit unique properties including unusual extensibility, reversible elasticity, and self-healing capabilities, for example. Catechol motifs are of particular interest owing to their ability to form many kinds of reversible bonds; however, there are few reports on the role of hydrogen bonds between catechols. Here, physically crosslinked self-assembled networks composed of catechol-functionalized ABA triblock co-polymers are synthesized and characterized to elucidate the role of intermolecular bonding between catechol motifs on bulk mechanical properties. The Young's moduli of equilibrated networks range from 16 to 43 MPa. Furthermore, the concentration of intermolecular interaction is controlled indirectly by synthesizing polymers with prescribed catechol concentrations on each A block. Further, network dynamics are characterized by measuring the relaxation spectrum, and it is found that the network mean relaxation time is inversely related to catechol density. Finally, networks exhibit time-dependent recovery after uniaxial strain. These findings establish important relationships between molecular design, network composition, and macroscopic mechanical properties of model soft matter networks with dynamic intermolecular bonds. Furthermore, this insight has the potential to guide the design of dissipative materials for use in applications ranging from consumer products to surgical materials.

中文翻译：

具有可重配置键的自组装聚合物网络本体力学性能的动态贡献。

包含动态和可逆键的软材料具有独特的性能，例如，具有异常的可扩展性，可逆的弹性和自愈能力。邻苯二酚基序由于能够形成多种可逆键而特别受关注。然而，关于邻苯二酚之间氢键作用的报道很少。在这里，由邻苯二酚官能化的ABA三嵌段共聚物组成的物理交联的自组装网络被合成并表征为阐明邻苯二酚基序之间的分子间键合对整体机械性能的作用。平衡网络的杨氏模量范围为16到43 MPa。此外，通过在每个A嵌段上合成具有规定的邻苯二酚浓度的聚合物来间接控制分子间相互作用的浓度。此外，通过测量弛豫谱来表征网络动力学，并且发现网络平均弛豫时间与儿茶酚密度成反比。最后，网络在单轴应变后表现出时间依赖性的恢复。这些发现建立了分子设计，网络组成和具有动态分子间键的模型软物质网络的宏观力学性能之间的重要关系。此外，这种见识有潜力指导耗散材料的设计，以用于从消费产品到外科手术材料的各种应用中。网络在单轴应变后表现出时间依赖性的恢复。这些发现建立了分子设计，网络组成和具有动态分子间键的模型软物质网络的宏观力学性能之间的重要关系。此外，这种见识有潜力指导耗散材料的设计，以用于从消费产品到外科手术材料的各种应用中。网络在单轴应变后表现出时间依赖性的恢复。这些发现建立了分子设计，网络组成和具有动态分子间键的模型软物质网络的宏观力学性能之间的重要关系。此外，这种见识有潜力指导耗散材料的设计，以用于从消费产品到外科手术材料的各种应用中。

更新日期：2019-12-27

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