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Interfacial adhesion and self-healing kinetics of multi-stimuli responsive colorless polymer bilayers
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-10-02 , DOI: 10.1016/j.compositesb.2020.108451
Youngnam Kim , Ki-Ho Nam , Yong Chae Jung , Haksoo Han

Simple self-healing behavior of polymers that respond to multiple physicochemical stimuli are highly desirable for industrial applications. In this study, under various external environmental stimulating factors, we focus on the self-healing kinetics of polymer bilayer films (PBFs) comprising a colorless polyimide (CPI) bottom-substrate layer and linseed oil loaded microcapsule (LOMC)-embedded polydimethylsiloxane (PDMS) upper-healing layer. The experimental results showed clear correlation between stimulating factors and the healing time. Although the crack-healing behavior of PBF with 5 wt% microcapsule under air atmosphere is fairly slow, it has an improved healing effect at the artificial crack interface heating to 70 °C; moreover, gradual healing is observed by moisture absorption in environments with relative humidity of 70%. Remarkably, we found that ultraviolet (UV)-light irradiation through the 5 wt% LOMC-filled PDMS layer triggers a noticeable kinematic advantage for the drying reaction that initiates interfacial self-healing. Short-time (20 min) UV-irradiated PBF 5 wt% exhibits a low water vapor permeability of 35.4 g m−2 day−1 and excellent healability with ~91% recovery by single capsule-type photochemical-induced self-healing. The proposed approach advances the extrinsic healing of colorless polymers in a kinetically effective way without compromising their chemical composition.



中文翻译:

多种刺激响应的无色聚合物双层的界面粘合和自修复动力学

响应多种物理化学刺激的聚合物的简单自我修复行为对于工业应用是非常需要的。在这项研究中,在各种外部环境刺激因素的作用下,我们专注于聚合物双层薄膜(PBF)的自修复动力学,该薄膜包括无色聚酰亚胺(CPI)底部基底层和亚麻籽油负载微胶囊(LOMC)包埋的聚二甲基硅氧烷(PDMS) )上部修复层。实验结果表明,刺激因素与愈合时间之间存在明显的相关性。尽管在空气气氛下,含5 wt%微胶囊的PBF的裂纹愈合行为相当缓慢,但在加热至70°C的人工裂纹界面时,其愈合效果得到了改善。此外,在相对湿度为70%的环境中,通过吸收水分可以观察到逐渐愈合。值得注意的是 我们发现,通过5 wt%的LOMC填充的PDMS层进行的紫外线(UV)辐射引发了引发界面自我修复的干燥反应,具有明显的运动学优势。5 wt%的短时间(20分钟)紫外线照射的PBF表现出35.4 g m的低水蒸气渗透性-2-1天,且具有出色的可修复性,并且通过单胶囊型光化学诱导的自我修复可实现约91%的恢复。所提出的方法以动力学有效的方式推进了无色聚合物的外在愈合,而没有损害其化学组成。

更新日期:2020-10-13
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