Investigating the degradation of environmentally friendly circuit substrates

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Hajdu István
Department of Electronics Technology

The topic of my thesis was to examine degradable or biodegradable circuit boards, which are made from renewable raw materials and are dissipated into environmentally harmless components when disintegrated. One of the main purposes of my research was to make different climate chamber measurements on the CA, PLA and GPTE-DETDA samples, so later I will have a better understanding of the possibilities of developing environmentally friendly printed circuit boards. These possibilities are the most favorable technological solutions for the production, the usability and lifetime of these boards, the improvement of their mechanical and electrical properties and the practical methods of extracting them from everyday use.

During the process I got an insight into the operation and characteristics of the HAST and THB climate chambers, which I described in my thesis in detail. With these climate chambers I made measurements on extreme condition levels and then documented the impact of the accelerated lifetime tests. Based on optical microscopic observations I also described the rate of the degradation on each sample.

The other branch of the research was the thermoanalitical analysis of the board materials. Here I was mainly focused on the TG (Thermogravimetry) and DSC (Differential Scanning Calorimetry) measurements. After describing the methods, I gave a more detailed summary of the degradation process based on the data obtained from the TG and DSC tests.


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