Microencapsulation forms an integral part in synthesizing bioinspired materials. This paper focuses on elaborating the problems faced in encapsulation of DGEBA microcapsules in PMMA and urea formaldehyde shell wall. The preparation process and the process parameters affecting the microcapsule property are discussed. The difference between the microcapsules prepared using emulsion polymerization and that by solvent evaporation has been discussed. The size, shape and morphology of the microcapsules was characterized using FESEM technique. It was observed that the agglomeration of the microcapsules can be prevented by changing the concentration of the emulsifier. However, in case of urea formaldehyde encapsulation chunks of pre-polymer resulted in agglomeration of the nanosized capsules even if higher concentration of emulsifier was implemented.
Stability of plastic packaging for electronic circuits and electrical devices partially depends on moisture penetration into the bulk of the package, especially for applications in harsh environments. Therefore, a technique capable of moisture diffusion dynamics in plastics would be valuable for design, testing, and field deployment of electronic devices. This paper presents a proof of concept experiment that demonstrates the viability of using electrical impedance spectroscopy and non-stationary fringing electric field sensors to obtain a one-dimensional profile of moisture distribution in plastics and composite materials. A fixed penetration depth sensor is moved orthogonal to the surface of the sample, and the resulting profile is a spatial convolution of progressive addition of different layers of the sample. Qualitative explanation of the experimental results is given and a roadmap for future work is laid out.
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