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首页> 外文期刊>Journal of Applied Polymer Science >Microencapsulated amino-functional polydimethylsiloxane as autonomous external self-healing agent for epoxy systems
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Microencapsulated amino-functional polydimethylsiloxane as autonomous external self-healing agent for epoxy systems

机译：微胶囊化的氨基官能聚二甲基硅氧烷作为环氧系统的自主外部自我愈合剂

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摘要

The self-healing material under investigation is a diglycidyl ether of bisphenol A (DGEBA) epoxy matrix, which incorporates microcapsules filled with amine-functionalized polydimethylsiloxane (PDMS-a), as a new healing agent, combined with microcapsules filled with triethylenetetramine (TETA). The fracture toughness (K-IC) and healing efficiency of these systems were measured using tapered double-cantilever beam specimens. Fractographic analysis shows the rupture of microcapsules and release of the healing agent, inducing a change in the mirror-like fracture plane morphology of neat epoxy and healing of cracks. It was also observed that PDMS-a reduces the stiffness of the epoxy matrix, resulting in greater energy release rate (U-IC) values. The values of self-healing efficiency for systems healed for 48 h at room temperature varied from 0.82 to 1.0 (eta, from K-IC values) and from 1.0 to 1.4 (eta', considering U-IC values). Specimens healed at 80 degrees C containing 2.5 wt% of microcapsules filled with PDMS-a and TETA achieved eta = 1.1 and eta' = 2.0, indicating a highly efficient self-healing process. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47627.
机译：正在研究的自愈材料是双酚A（DGEBA）环氧基质的二缩水甘油醚，其将填充用胺官能化的聚二甲基硅氧烷（PDMS-A）的微胶囊掺入新的愈合剂，与填充有三乙基甲胺（TETA）的微胶囊结合。使用锥形双悬臂梁标本测量这些系统的断裂韧性（K-IC）和愈合效率。 Fretography分析显示微胶囊的破裂和愈合剂的释放，诱导晶体环氧树脂的镜像骨折平面形态的变化和裂缝的愈合。还观察到，PDMS-A降低了环氧基质的刚度，导致更大的能量释放速率（U-IC）值。在室温下愈合的系统的自愈效率值在0.82至1.0（从K-IC值）和1.0至1.4（ETA'，考虑U-IC值）。标本在80℃下愈合，含有2.5wt％的微胶囊，填充有PDMS-A和TETA的ETA = 1.1和ETA'= 2.0，表示高效的自我愈合过程。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47627。

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