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Study on self‐healing behavior of the layer‐by‐layer assembled polyethylenimine/poly(acrylic acid) film
Journal of Applied Polymer Science ( IF 3 ) Pub Date : 2020-03-25 , DOI: 10.1002/app.49169 Hongxu Chen 1 , Fengmei Cheng 1 , Chao Chen 1 , Haidong Li 1
Journal of Applied Polymer Science ( IF 3 ) Pub Date : 2020-03-25 , DOI: 10.1002/app.49169 Hongxu Chen 1 , Fengmei Cheng 1 , Chao Chen 1 , Haidong Li 1
Affiliation
Many studies have demonstrated that intrinsic self‐healing polyelectrolyte coatings can be fabricated by exponentially growing Layer‐by‐Layer (LbL) assembled polyelectrolyte multilayers. However, due to the lack of controlled self‐healing evaluation methods, the researches on self‐healing properties have remained at some simple qualitative characterization. In our study, a self‐healing branched polyethylenimine (bPEI)/poly(acrylic acid) (PAA) films is successfully prepared by LbL and a new systematical self‐healing evaluation method is developed. The cuts with controllable depth, width, and period can be easily fabricated on bPEI/PAA films through the colloidal lithography and photolithography. Colloidal lithography, as a facile, low‐cost, and versatile unconventional technique, can realize precise and repetitive fabrication of cuts at the same sample and in the same area, which will be beneficial to the systematic study and evaluate self‐healing behavior. The self‐healing behaviors on the different cuts are observed by scanning electron microscope (SEM). The SEM results reveal that bPEI/PAA film could realize damage/healing process for multiple times at the same sample and in the same area. In addition, the self‐healing abilities of the LbL films are related to the damage number, depth, and width of cuts. With the increase of damage number, depth, and width of cuts, the loss of polyelectrolyte was also increased, which lead to the flow of remaining polyelectrolytes were not enough to heal the cuts. This work provides a new route to systematically characterize the self‐healing ability of bPEI/PAA films as well as other polyelectrolyte films.
中文翻译:
多层聚乙烯亚胺/聚丙烯酸薄膜的自愈性能研究
许多研究表明,可以通过成倍地增长逐层(LbL)组装的聚电解质多层来制造固有的自修复聚电解质涂层。但是,由于缺乏可控的自我修复评估方法,对自我修复特性的研究仍停留在一些简单的定性表征上。在我们的研究中,LbL成功制备了一种自愈支化聚乙烯亚胺(bPEI)/聚丙烯酸(PAA)膜,并开发了一种新的系统化自愈评价方法。通过胶体光刻和光刻,可以在bPEI / PAA薄膜上轻松制作深度,宽度和周期可控的切口。胶体光刻技术是一种简便,低成本且用途广泛的非常规技术,可以在相同的样品和相同的区域实现精确且重复的切口制作,这将有助于系统地研究和评估自我修复行为。通过扫描电子显微镜(SEM)观察不同切口的自愈行为。SEM结果表明,bPEI / PAA膜可以在相同的样品和相同的区域多次实现损伤/愈合过程。此外,LbL膜的自我修复能力与损伤的数量,切口的深度和宽度有关。随着损伤数目,切口深度和切口宽度的增加,聚电解质的损失也增加,这导致剩余的聚电解质的流动不足以治愈切口。
更新日期:2020-03-25
中文翻译:
多层聚乙烯亚胺/聚丙烯酸薄膜的自愈性能研究
许多研究表明,可以通过成倍地增长逐层(LbL)组装的聚电解质多层来制造固有的自修复聚电解质涂层。但是,由于缺乏可控的自我修复评估方法,对自我修复特性的研究仍停留在一些简单的定性表征上。在我们的研究中,LbL成功制备了一种自愈支化聚乙烯亚胺(bPEI)/聚丙烯酸(PAA)膜,并开发了一种新的系统化自愈评价方法。通过胶体光刻和光刻,可以在bPEI / PAA薄膜上轻松制作深度,宽度和周期可控的切口。胶体光刻技术是一种简便,低成本且用途广泛的非常规技术,可以在相同的样品和相同的区域实现精确且重复的切口制作,这将有助于系统地研究和评估自我修复行为。通过扫描电子显微镜(SEM)观察不同切口的自愈行为。SEM结果表明,bPEI / PAA膜可以在相同的样品和相同的区域多次实现损伤/愈合过程。此外,LbL膜的自我修复能力与损伤的数量,切口的深度和宽度有关。随着损伤数目,切口深度和切口宽度的增加,聚电解质的损失也增加,这导致剩余的聚电解质的流动不足以治愈切口。