Pestka K A, Buckley J D, Kalista S J, Bowers N R
Department of Chemistry and Physics, Longwood University, Farmville, Virginia, 23909, USA.
Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA.
Sci Rep. 2017 Oct 31;7(1):14417. doi: 10.1038/s41598-017-14321-z.
Self-healing poly (ethylene co-methacrylic acid) ionomers (EMAA) are thermoplastic materials that when punctured, cut, shot or damaged in a variety of ways, are capable of autonomously reorganizing their physical structure to heal and, in many instances, permanently seal the damaged location. However, a complete picture of the mechanisms responsible for their unusual behavior is not well understood. In this article we report the observation of time dependent acoustic and ultrasonic spectral evolution, measured using resonant acoustic and ultrasonic spectroscopy, for both pre and post-damage EMAA samples. The results provide a means to differentiate healing phases, quantify healing timescales, and potentially elucidate the composition parameters that most significantly impact healing behavior.
自修复聚（乙烯-共-甲基丙烯酸）离聚物（EMAA）是一种热塑性材料，当以各种方式被刺穿、切割、枪击或损坏时，能够自主重组其物理结构以实现愈合，并且在许多情况下能永久密封受损部位。然而，对于导致其异常行为的机制的完整情况，人们还了解得不够透彻。在本文中，我们报告了使用共振声学和超声光谱法对损伤前后的EMAA样品进行测量时观察到的随时间变化的声学和超声光谱演变情况。这些结果提供了一种区分愈合阶段、量化愈合时间尺度并有可能阐明对愈合行为影响最显著的组成参数的方法。
