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materials | Thermally conductive compounds


tivity at low loadings.” Imerys has tested its graphites in polyamide 6, which


Figure 3: Thermal conductivity of PA6 compounds containing av-PLAT-70, Graphite NanoPlatelets (GNP) and conductive carbon black at loading levels from 0-7%. Thermal conductivity of 1.5 W/m.K has been obtained in a compound containing 5 vol% av-PLAT-70 Source: Avanzare


graphite grades, are generally better accepted,” says Bonacchi. “Nevertheless, high tech solutions like C-Therm family products [see Compounding World Feb 2016] are still the first choice to manufacture thermally conductive polymers with outstanding thermal conduc-


Bonacchi notes is the “polymer of choice” for many automotive applications that require a certain thermal stability. “We found that our 80x150 mesh natural graphite gives exceptional good thermal conductivity at a relatively low loading of 50% by weight: in-plane thermal conductivity was found to be 14 W/m.K in injection moulded 2.0mm thick plaques. This value seems high when compared to the values obtained in polypropylene (6 W/m.K) but this can be easily explained by the large density difference between the two polymers,” he says, adding that even with a 50% loading of 80x150 graphite, the polyamide compound still flows well.


Nanocarbon options Avanzare has recently developed a new graphene/ graphite nanoplatelet grade with a large lateral size called av-PLAT-70. Due to the combination of both very large lateral dimensions (70-100 microns) and extreme- ly low thickness (approximately 10nm), very low dosages are required to reach the percolation thresh- old, the company says (Figure 3). As a result, it has


Polymers


Enhancing conductivity ENSACO


® Conductive Carbon Black


• Electrical conductivity • Easy-dispersion • High purity


For electronic packaging, fuel hoses, fl ooring, power cables and accessories, conveying belts, ATEX applications.


www.imerys-graphite-and-carbon.com TIMREX ® Graphite and Expanded Graphite


• Thermal conductivity • Electrical conductivity • Lubrication


For seals, water-meters, heat sinks, geothermal pipes, LED light sockets, primers for electrostatic painting, gas barrier properties.


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