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A Delivery System For Self-healing Inorganic Films

机译：自修复无机薄膜的递送系统

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Multilayer composites that utilize polymeric and brittle inorganic films are essential components for extending the lifetimes and exploiting the flexibility of many electronic devices. However, crack formation within the brittle inorganic layers that arise from defects as well as the flexing of these multilayer composite materials allows the influx of atmospheric water, a major source of device degradation. Thus, a composite material that can initiate self-healing upon the influx of environmental water through defects or stress-induced cracks would find potential applications in multilayer composite materials for permeation barriers. In the present study, the reactive metal oxide precursor TiCl_4 is encapsulated within the pores of a degradable polymer, poly(lactic acid) (PLA). Electrospun PLA fibers are found to be reactive to atmospheric water leading to the hydrolysis of the degradable polymer shell and subsequent release of the reactive metal oxide precursor. Release of the reactive TiCl_4 from the pores results in hydrolysis of the metal oxide precursor, forming solid titanium oxides at the surface of the fibers. The efficacy of this self-healing delivery system is also demonstrated by the integration of these reactive fibers in the polymer planarization layer, poly(methyl methacrylate), of a multilayer film, upon which an alumina barrier layer is deposited. The introduction of nanocracks in the alumina barrier layer lead to the release of the metal oxide precursor from the pores of the fibers and the formation of titanium dioxide nanoparticles within the crack and upon the thin film surface. In this study the first delivery system that may find utility for the self-healing of multilayer barrier films through the site-specific delivery of metal oxide nanoparticles through smart reactive composite fibers is established.
机译：利用聚合物和脆性无机薄膜的多层复合材料是延长使用寿命和利用许多电子设备的灵活性的重要组成部分。然而，由于缺陷以及这些多层复合材料的挠曲而在脆性无机层内形成的裂纹允许大气水的涌入，大气水是器件退化的主要来源。因此，可以通过缺陷或应力引起的裂纹在环境水流入时开始自我修复的复合材料将在用于渗透屏障的多层复合材料中找到潜在的应用。在本研究中，反应性金属氧化物前体TiCl_4封装在可降解聚合物聚乳酸（PLA）的孔中。发现电纺PLA纤维对大气中的水具有反应性，从而导致可降解的聚合物外壳水解并随后释放出反应性金属氧化物前体。反应性TiCl 4从孔中释放导致金属氧化物前体水解，在纤维表面形成固体氧化钛。通过将这些反应性纤维整合到多层膜的聚合物平面化层（聚甲基丙烯酸甲酯）中，并在其上沉积氧化铝阻隔层，也证明了这种自我修复输送系统的功效。纳米裂纹在氧化铝阻挡层中的引入导致金属氧化物前体从纤维的孔中释放出来，并在裂纹内和薄膜表面上形成二氧化钛纳米颗粒。在这项研究中，建立了第一个输送系统，该系统可以通过智能反应性复合纤维对金属氧化物纳米颗粒进行定点输送来发现多层阻隔膜的自修复作用。

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