Abstract-Draft-Yuxuan Liu
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Researchers are studying self-healing polymer coatings using core-shell nano-capsules containing a bisphenol A diglycidyl ether core and a poly(urea-formaldehyde) shell. The capsules were synthesized using a mini-emulsion polymerization method and characterized using techniques such as dynamic light scattering, scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy. The capsules were then mixed into a polyurea matrix and demonstrated self-healing properties after fracturing at low temperatures, as shown through scanning electron microscopy images and dynamic mechanical analysis measurements of loss modulus before and after healing.
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Abstract-Draft-Yuxuan Liu
- 1. Self-healing Polymer Coatings Yuxuan Liu†,‡ and Bridgette M. Budhlall†,‡ † Department of Plastics Engineering, ‡ NSF Center for High-Rate Nanomanufacturing, Umass Lowell. Our research are aim to study self-healing activities by action of core-shell nano-capsules, sort of thermoset shell, Poly(urea-formaldehyde) (PUF), and Bisphenol A Diglycidyl Ether (DGEBA) core. The technology will be used for coating, auto and even starship painting, many of hi-tech but full of accuracy, to make the layer self-heal automatically in room temperature. Now we have synthesized submicron spherical capsules through modified in-situ oil-in-water mini-emulsion polymerization method with Poly(Ethylene-Maleic-Anhydride) (EMA) as the surfactants, mechanical agitated by ultra-sonic technology, and the size range and distribution, as well as surface feature, were determined by Dynamic Light Scattering (DLS) ， Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). The chemical structure was determined by Fourier Transform Infrared Spectroscopy (FTIR). Thermal Gravimetric Analysis (TGA) images expressed directly mass loss of each component, illustrating more accurate mass ratio of core-to-shell, cooperated with FTIR. We designed the method by mixing capsules into Polyurea matrix with brittle fracture under -40 oC, and demonstrated self-healing properties by SEM images and quantization of Dynamic Mechanical Analysis (DMA) results in terms of loss modulus before and after healing stage.