| Abstract [eng] |
The master's thesis study explored and described two components composite consisting of epoxy resin and multiwalled carbon nanotubes. The mechanical properties of bio epoxy resins and bio epoxy resins with carbon nanotube composites were analysed. Different combinations of bio-based epoxy resin and carbon nanotube composites were selected, which varied in the concentration of carbon nanotubes in the matrix as a percentage by mass: 0,2 %; 0,4 %; 0,6 %; 0,8 %; 2,0 %; 5,0 %; 10,0 %. Three units of each type of sample were produced. Tensile, bending and hardness tests were conducted experimentally. Based on the results of the tensile test, it was stated that the composites of the selected combinations do not reach the bio-based epoxy resin indicators without additives – the values of parameters decreased with increasing amount of carbon nanotubes. The load value – 1087,0 N, was 47,0 % lower with 5,0 % CNT concentration compared to the bio resin value – 2036,0 N. The lowest tensile strength value (25,47 MPa) was obtained with 5,0 % concentration of CNT, it is 35,0 % lower compared to the value of bio resin (39,45 MPa). The highest elongation was achieved with bio resin samples – 2,69 %. With a composite concentration of 5,0 % CNT, this value – 1,05 %, is 2,56 times lower. When the amount of carbon nanotubes increases, the brittleness of the composite also increases. The experimental test results showed that bending and microhardness values increase with the amount of carbon nanotubes in the bio epoxy resin. The maximum average load value was reached with 0,8 % CNT concentration – 162,0 N. Compared to the bio epoxy resin result – 128,0 N, the result is better by 27,0 %. The highest flexural strength value – 56,98 MPa, was obtained with a 0,8 % concentration of CNT. This result is 1,5 times higher than the value of the epoxy resin composite. The values of the bending test do not depend on the agglomerations of carbon nanotubes, and the increase of microhardness values is associated with improved bonding of carbon nanotubes to the epoxy network. |
