Characterization of core-shell microstructure and self-healing performance of electrospun fiber coatings

POLYMER

卷:107

Article

Doan, Thu Q.^1,5  Leslie, L. Suzanne^2,5  Kim, Sang Yup^3,5  Bhargava, Rohit^2,5  White, Scott R.^4,5  Sottos, Nancy R.^1,5 

[1] Univ Illinois, Dept Mat Sci & Engn, 1304 West Green St, Urbana, IL 61801 USA

[2] Univ Illinois, Dept Bioengn, 1304 West Springfield Ave, Urbana, IL 61801 USA

[3] Univ Illinois, Dept Mech Sci & Engn, 1206 W Green St, Urbana, IL 61801 USA

[4] Univ Illinois, Dept Aerosp Engn, 104 South Wright St, Urbana, IL 61801 USA

[5] Univ Illinois, Beckman Inst Adv Sci & Technol, 405 North Mathews Ave, Urbana, IL 61801 USA

关键词: Self-healing;    Electrospinning;    Coating;    Encapsulation;    Core-shell fibers;    Corrosion;   

DOI  :  10.1016/j.polymer.2016.10.062

来源: Elsevier

【 摘 要 】

Electrospun fibers are a promising method for encapsulation of reactive agents in self-healing coatings. Healing is initiated by mechanical damage to the coating causing the fibers to rupture and release their core materials into the damage region. Prior work has demonstrated autonomous healing in coatings containing electrospun fibers, but full characterization of the electrospun fiber microstructure and healing performance of the coating is lacking. In this study, we utilize electrospun fibers containing liquid healing agents to achieve a crosslinking reaction of poly(dimethylsiloxane) (PDMS) to a crosslinking agent poly(diethoxysiloxane) (PDES), initiated by the catalyst dibutyltindilaurate (DBTL), to fill a damaged region and reseal the metal substrate. Fiber morphology is characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and confocal fluorescence microscopy (CFM). Successful delivery of healing agents to the damage region and subsequent crosslinking reaction is observed using SEM and chemically using infrared spectroscopy. The performance of the healed coating is evaluated electrochemically using linear polarization, where the coatings were subjected to a corrosive environment. The self-healing electrospun coating exhibits lower corrosion current than in control cases, resulting in an 88% corrosion inhibition efficiency. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free