| Abstract [eng] |
Radio-frequency identification (RFID) can be used for shipment tracking, identification, product protection from counterfeiting. Replacing RFID connections that are susceptible to damage while bending allows the RFID tag to be used on non-planar surfaces, improves their flexural durability and may decrease their manufacturing cost. Project goal – selection of cost-effective disperse filler, suitable for production of electrically conductive adhesive without significant decrease of adhesive properties. The solvent based adhesive based on linear triblock styrene – isoprene – styrene and diblock styrene – isoprene copolymers blend was used. Inexpensive and readily available silica particles, milled and coated with a thin silver layer were used for adhesive composition modification. Additionally, graphite felt fibers were used to achieve percolation with lower silica loading. For investigations, structural analysis methods, such as optical and scanning electron microscopies, X-ray diffraction, fluorescence and energy-dispersive spectroscopy, and electrical conductivity and adhesive properties evaluation methods were employed. Fractional, dimensional and morphological examination showed that after milling size of silica particles reduces 10 times. Minimal length of graphite fibers was ca. 40 μm, while diameter was found out to be 9 μm. It was determined that silver coated fillers conductivity increases with the increase of layer thickness, while opposite results were observed with the graphite fiber filler. Adhesive composition gains ability to transmit electrons at 70 % of silver-coated particles amount. On the other hand, electrically conductive adhesive can be obtained by mixing of 2 % of graphite fiber in the adhesive compositions with 25 % silver-coated particles. Peel strength depends on the filler type and content. It increases up to 25 % of silver-coated silica loading, while addition of graphite fiber results in peel strength decrease. |
