Article Title: Thermally conductive polyamide 6/carbon filler composites based on a hybrid filler system
Science and Technology of Advanced Materials, Volume 16, Number 6, December 2015
Sung Min Ha, O Hwan Kwon, Yu Gyeong Oh, Yong Seok Kim, Sung-Goo Lee, Jong Chan Won, Kwang Soo Cho, Byoung Gak Kim and Youngjae Yoo
"20. 065001 - Science and Technology of Advanced Materials, Volume 16, Number 6, December 2015.pdf"
Some other links:
- Polymer matrix composites (PMCs) are popular due to their corrosion resistance, durability, miniturization capabilities, weight reduction capabilities, and low fabrication cost
- For electronic devices, materials are required that transfer away all of the heat for example to a heat sink, so high thermal conductivity is required
- Polymers are filled with thermally conductive fillers (carbon, ceramic, metallic). Other such fillers are graphite, graphene, carbon nanotubes, boron nitride, aluminium nitride. Hybrid filler systems are also possible (combining more than one filler).
- What is being looked at here is incorporating of graphite nanoplatelets (GNP), & single walled carbon nanotubes (SWCNTs), as filler materials in PA 6 (polyamide 6), to investigate changes in the annealing behaviours (subject to heating and slow cooling to toughen and reduce brittleness) and thermal conductivity (measured using laser flash method). f-SWCNTs have carboxyl group treatment whereas SWCNTs are pristine SWCNTs.
- A micro-injection molding machine is used to combine the component materials at a pressure of 16 bar, barrel temperature 270C, mold temperature 80C (with injection molding, materials are heated and inserted into a mold at high pressure and after they cool the mold is removed to leave the created item)
- Thermal conductivity was found to increase with greater GNP or SWCNT content, but if there was f-SWCNT then at first it increased with 1 wt% f-SWCNT but with 5 wt% f-SWCNT it was lower than for 1 wt% f-SWCNT (but higher than for no f-SWCNT).
- How Does Injection Molding Work? http://www.cs.cmu.edu/~rapidproto/students.03/mrau/project2/report/1.html
- How do these results and properties differ if the following main categories of PMCs are used:
carbon fibre reinforced polymer composites (CFRPs), glass fibre reinforced polymer composites
(GFRPs), aramid fibre reinforced polymer composites (AFRPs)? Which of these are suitable for use
in electronics heat conduction?
- How do organic polymers like polysiloxanes come into this picture, eg with ceramic fillers?
- What about nanocomposites?
- Are there any materials found in nature (eg from mining under the ground, or in plants or animals) that could be used as additional fillers?