基于界面氢键结构的石墨烯/聚合物复合材料的阻尼性能

Damping Enhancement of Graphene/Polymer Composites Based on Interfacial Interactions of Hydrogen Bonds

提出在石墨烯/聚合物复合材料内构筑界面氢键结构,利用氢键的动态可逆性和断裂/再生过程中的能量耗散可显著提高复合材料的阻尼性能。对石墨烯和聚(苯乙烯-乙烯-丁二烯-苯乙烯)(SEBS)进行接枝改性,引入氢键单元从而在石墨烯/SEBS复合材料的界面构筑了多重氢键结构。研究了这种复合材料的循环拉伸以及动态力学性能。结果表明,这种复合材料的弹性模量、滞后损耗、阻尼因子比SEBS分别提高165%、237%和42%。强度和阻尼性能的显著提高,主要归因于复合材料组元间界面氢键的相互作用、高效应力传递、以及氢键可逆断裂/再生过程中显著的能量耗散。

Developing advanced composites with high strength and high vibration damping is extremely important for ensuring high safety and reliability of composites in high-frequency-vibration circumstances.In this paper,we proposed a novel strategy to remarkably enhance the damping property of composites by introducing reversible hydrogen bonds at the interfaces of graphene/polymer composites.Graphene and poly(styrene-ethylene-butadiene-styrene)(SEBS)were chemically modified to graft hydrogen bonding moiety,consequently forming multiple hydrogen-bonding networks at interfaces of graphene/SEBS composites.The cyclic tensile behavior and dynamic mechanical properties of the composites were investigated in detail.The results showed that the mechanical and damping properties of graphene/SEBS composites were greatly improved by introducing graphene and interfacial hydrogen-bonding structures.The elastic modulus,hysteresis loss,and damping ratio of the graphene/SEBS composites were increased by 165%,237%and 42%in comparison with that of SEBS.Such remarkable enhancement in both mechanical and damping properties is mainly attributed to the interfacial hydrogen bonds between components,high-efficiency stress-transferring,and significant energy dissipation resulted from reversible breaking/formation of hydrogen bonds during cyclic deformation.