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.
INNOVATIONS TO POWER EVERYDAY LIFE
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88