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Influence of same particle size layered silicates on thermal conductivity of unsaturated polyester imide resin

The properties of polymer materials can be improved by adding particles of micrometer and nanometer dimensions without impairing the existing properties, hence developing new composite materials. Unsaturated polyester resins are often research for their application in the impregnation industry due to good electrical resistance and mechanical properties as well as good thermal stability. By incorporating thermally conductive nano/microparticles into the polymer phase, the thermomechanical properties of the polymer composite can be changed as a result of increased concentration of thermal phonons, resulting a more thermally conductive material. We investigated the thermal conductivity and microparticles distribution in samples of duromer systems with different microparticles of layered silicates with the same diameter. The continuous phase represents the unsaturated polyester imide resin, while the discontinuous phases are particles of biotite, phlogopite, fluorophlogopite and muscovite with an average microparticles diameter of 45 μm. The results of the thermal conductivity for 1 and 10 wt% composites show that highest conductivity is obtained for muscovite filler (10.8 % and 129.4 % respectively), while for the 5 wt% composites fluorophlogopite shows the highest increase in thermal conductivity (44.1 %). To determine the homogeneity of filler distribution and evaluate the quality of preparation procedure of composite systems, the top and bottom parts of the sample were analyzed with thermogravimetric analysis. The system with muscovite particles showed the best particle distribution.

Unsaturated polyester resins ; Thermal conductivity ; Composite

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