通过混合微胶囊-微血管自愈系统恢复聚合物的冲击损伤,Advanced Functional Materials

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通过混合微胶囊-微血管自愈系统恢复聚合物的冲击损伤
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-11-23 , DOI: 10.1002/adfm.201704197
Ryan C. R. Gergely ₁ , Windy A. Santa Cruz ₂ , Brett P. Krull ₃ , Emmy L. Pruitt ₂ , Jonathan Wang ₃ , Nancy R. Sottos ₃ , Scott R. White ₄

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引入了一种混合的微胶囊-微血管系统，以再生由血管化聚合物薄片的穿刺所引起的多尺度损伤。微血管输送的两阶段愈合剂可恢复损失的损伤量（穿刺），以恢复冲击能量的吸收，而嵌入式微胶囊则可愈合微裂纹以促进密封。通过选择相容的反应性丙烯酸酯单体，可以实现固化后固化剂的机械性能（1.4 GPa至1.1 MPa硬度）的调节。穿刺标本，并通过微血管网络将两阶段愈合剂输送到损伤部位，从而恢复受影响的孔和周围受损的体积。两阶段愈合剂的快速胶凝可使其保留在损伤区域，同时后续聚合可恢复结构性能。根据能量吸收评估冲击恢复效率，将重新冲击的试样与初始冲击进行比较。最佳样品设计可观察到高达100％的冲击能量吸收恢复。样品在静态加压下进行了密封测试，以监测通过恢复的损坏引起的泄漏。结合了两阶段愈合剂的微血管输送和含有溶剂化环氧树脂的微胶囊的混合系统可以密封100％的样品。测试样品在静态加压下的密封性，以监测通过修复后的损坏引起的泄漏。结合了两阶段愈合剂的微血管输送和含有溶剂化环氧树脂的微胶囊的混合系统可以密封100％的样品。测试样品在静态加压下的密封性，以监测通过修复后的损坏引起的泄漏。结合了两阶段愈合剂的微血管输送和含有溶剂化环氧树脂的微胶囊的混合系统可以密封100％的样品。

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Restoration of Impact Damage in Polymers via a Hybrid Microcapsule–Microvascular Self‐Healing System

A hybrid microcapsule–microvascular system is introduced to regenerate the multiscale damage that results from impact puncture of vascularized polymeric sheets. Microvascular delivery of a two‐stage healing agent restores lost damage volume (puncture) to recover impact energy absorption, while embedded microcapsules heal microcracks to facilitate sealing. Modulation of the mechanical properties (1.4 GPa to 1.1 MPa stiffness) of the healing agent after curing is achieved by selection of compatible reactive acrylate monomers. Specimens are punctured and the impacted hole and surrounding damaged volume is restored by delivering the two‐stage healing agents to the site of damage via a microvascular network. Rapid gelling of two‐stage healing agents enables their retention in the damage region, while subsequent polymerization recovers structural performance. Impact recovery efficiency is assessed in terms of energy absorption, comparing reimpacted specimens to the initial impact. Recovery of impact energy absorption as high as 100% is observed for the optimal specimen design. Specimens are tested for sealing under static pressurization to monitoring leakage through the restored damage. A hybrid system incorporating both microvascular delivery of the two‐stage healing agents and microcapsules containing solvated epoxy enables sealing of 100% of specimens.

更新日期：2017-11-23

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