Influence of Processing on Morphology, Electrical Conductivity and Flexural Properties of Exfoliated Graphite Nanoplatelets–Polyamide Nanocomposites

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 11권 / 4호
ㆍ저자명 : Wanjun Liu, Inhwan Do, Hiroyuki Fukushima , Lawrence T. Drza

목차

1. Introduction
2. Material Considerations
3. Experimentation
4. Results and Discussion
5. Conclusions
Acknowledgements
References

한국어 초록

Graphene is one of the most promising materials for many applications. It can be used in a variety of applications not only
as a reinforcement material for polymer to obtain a combination of desirable mechanical, electrical, thermal, and barrier
properties in the resulting nanocomposite but also as a component in energy storage, fuel cells, solar cells, sensors, and
batteries. Recent research at Michigan State University has shown that it is possible to exfoliate natural graphite into graphite
nanoplatelets composed entirely of stacks of graphene. The size of the platelets can be controlled from less than 10 nm in
thickness and diameters of any size from sub-micron to 15 microns or greater. In this study we have investigated the influence
of melt compounding processing on the physical properties of a polyamide 6 (PA6) nanocomposite reinforced with exfoliated
graphite nanoplatelets (xGnP). The morphology, electrical conductivity, and mechanical properties of xGnP-PA6
nanocomposite were characterized with electrical microscopy, X-ray diffraction, AC impedance, and mechanical properties. It
was found that counter rotation (CNR) twins crew processed xGnP/PA6 nanocomposite had similar mechanical properties
with co-rotation (CoR) twin screw processed or with CoR conducted with a screw design modified for nanoparticles (MCoR).
Microscopy showed that the CNR processed nanocomposite had better xGnP dispersion than the (CoR) twin screw processed
and modified screw (MCoR) processed ones. It was also found that the CNR processed nanocomposite at a given xGnP
content showed the lowest graphite X-ray diffraction peak at 26.5o indicating better xGnP dispersion in the nanocomposite. In
addition, it was also found that the electrical conductivity of the CNR processed 12 wt.% xGnP-PA6 nanocomposite is more
than ten times higher than the CoR and MCoR processed ones. These results indicate that better dispersion of an xGnP-PA6
nanocomposite is attainable in CNR twins crew processing than conventional CoR processing.

영어 초록

Graphene is one of the most promising materials for many applications. It can be used in a variety of applications not onlyas a reinforcement material for polymer to obtain a combination of desirable mechanical, electrical, thermal, and barrierproperties in the resulting nanocomposite but also as a component in energy storage, fuel cells, solar cells, sensors, andbatteries. Recent research at Michigan State University has shown that it is possible to exfoliate natural graphite into graphitenanoplatelets composed entirely of stacks of graphene. The size of the platelets can be controlled from less than 10 nm inthickness and diameters of any size from sub-micron to 15 microns or greater. In this study we have investigated the influenceof melt compounding processing on the physical properties of a polyamide 6 (PA6) nanocomposite reinforced with exfoliatedgraphite nanoplatelets (xGnP). The morphology, electrical conductivity, and mechanical properties of xGnP-PA6nanocomposite were characterized with electrical microscopy, X-ray diffraction, AC impedance, and mechanical properties. Itwas found that counter rotation (CNR) twins crew processed xGnP/PA6 nanocomposite had similar mechanical propertieswith co-rotation (CoR) twin screw processed or with CoR conducted with a screw design modified for nanoparticles (MCoR).Microscopy showed that the CNR processed nanocomposite had better xGnP dispersion than the (CoR) twin screw processedand modified screw (MCoR) processed ones. It was also found that the CNR processed nanocomposite at a given xGnPcontent showed the lowest graphite X-ray diffraction peak at 26.5o indicating better xGnP dispersion in the nanocomposite. Inaddition, it was also found that the electrical conductivity of the CNR processed 12 wt.% xGnP-PA6 nanocomposite is morethan ten times higher than the CoR and MCoR processed ones. These results indicate that better dispersion of an xGnP-PA6nanocomposite is attainable in CNR twins crew processing than conventional CoR processing.

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