MATERIALS | NANOCOMPOSITES
became dissipative on the fourth,” she says. “It is possible to recycle compounds containing NC7000 as the compound will lose properties related to the presence of the CNTs only when or after the polymer structure is damaged.”
Figure X: Tensile modulus data of four G-PMCs (Graphene-Polymer Matrix Composites) with different loading of TLC Products’ graphene nanoparticles, which are produced using an in-situ graphite exfoliation process Source: TLC Products
ing applications, the CNT-containing material achieved results that would allow the material to replace metal foils currently used for EMI shielding. CNTs can allow the formulator to remove significant amounts of carbon black from the compound recipe and gives greater freedom of design to optimise compounds and make them easier to process but to display better properties, Goldstein says. These formulas can also contribute to light-weighting efforts. Belgium-based Nanocyl, which celebrated its anniversary last year, produces multiwall (MW)
20th
CNTs as well as MWCNT-based compounds and masterbatches. With sustainability a growing concern, its researchers recently completed a project to determine whether the company’s NC7000 MWCNTs maintain electrical properties through mechanical recycling. HDPE and HIPS resins were loaded with NC7000 and submitted to several extrusion cycles, with melt flow rate and electrical resistivity (surface and volume) measured at each cycle. “An increase in resistivity of the samples proves breakage of the nanotubes, whilst an increase in MFR can be related to both breakage of polymer chains and nanotubes,” says Carla Sottili, Business Unit manager for Polymers at Nanocyl. “Preliminary results have shown that nanotubes are able to resist several recycling cycles without losing significantly in electrical conductivity.” Sottili says that the polymer type has an effect. “Plasticyl HIPS compounds were extruded five times without a significant increase of MFR or any loss of conductivity. Plasticyl HDPE samples withstood three cycles before MFR increased significantly. The compound was conductive up to the third cycle and
22 COMPOUNDING WORLD | October 2023
CNT investments Korea’s LG Chem announced this summer that it has started construction of its fourth carbon nanotube (CNT) plant at its Daesan Complex in Gyeonggi Province. The plant is expected to open in 2025 and the additional capacity will double the company’s annual CNT production capability to 6,100 tonnes. LG says that demand is growing for CNTs for use as conductive additives in electric vehicle batteries, which will account for the bulk of the new CNT capacity. However, it will also improve availability for plastics applications in markets such as automotive. Meanwhile, single wall carbon nanotube
producer (SWCNT) OCSiAl has been given permission to build a production plant near Belgrade in Serbia. The company — headquartered and listed in Luxembourg but currently manufactur- ing all its Tuball SWCNTs at an 80 tonnes/yr plant at Novosibirsk in Russia where the technology was developed — says the new plant will start produc- tion in 2024 with 60 tonnes/yr capacity. It will make raw nanotubes, suspensions for lithium-ion battery production, and concentrates for plastic compounds and will operate in conjunc- tion with its R&D centre and planned production operation, currently under construction, in Luxem- bourg. “The project will facilitate logistics and lower supply chain costs. European-produced nanotubes and nanotube derivatives will be primarily supplied to our customers in central and western Europe, North America, and Asia,” says OCSiAl Group Senior Vice President Gregory Gurevich.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.gerdaugraphene.com �
https://nanoxplore.ca/ �
https://mitomaterials.com/ �
www.universalmatter.com �
https://blackswangraphene.com �
https://graphenest.com/ �
https://hubron.com/ �
https://graphene-flagship.eu/ �
https://lyten.com/ �
https://tlcproductsinc.com/ �
https://kafrit.com/ �
www.nemonano.com �
https://www.nanocyl.com/ �
www.lgchem.com �
www.ocsial.com
www.compoundingworld.com
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