Conductive polymer composites made from polypropylene and recycled graphite scrap

Tong, Dylan Jia Yee and Koay, Seong Chun and Chan, Ming Yeng and Tshai, Kim Yeow and Ong, Thai Kiat and Buys, Yose Fachmi (2021) Conductive polymer composites made from polypropylene and recycled graphite scrap. Journal of Physical Science, 32 (3). pp. 31-44. ISSN 1675-3402, DOI

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Electric Discharge Machining (EDM) process uses electrodes made from graphite that wear out over time and are turned into scrap. In this research, EDM electrode scraps were recycled and turned into graphite powder (rGP). This rGP was used as a conductive filler to produce conductive polymer composite (CPC) material by combining it with polypropylene (PP) resin via melt compounding and compression moulding processes. The percolation threshold of this composite material changed when 30 wt% of rGP was added, whereby the insulative material changed became antistatic. The composite was able to achieve surface resistivity as low as 10(5) ohm/sq. However, the addition of higher rGP content deteriorated the tensile properties of composite, whereby the tensile strength of composite significantly decreased as compared to neat PP. The results also showed that the tensile modulus of this composite became higher, and the material became more brittle as compared to neat PP. However, the PP/rGP composite with 50 wt% filler content reduced the tensile modulus due to plasticising effect caused by the agglomeration of rGP. The addition of high filler content on PP/rGP composite also caused an increase in processing torque. This was due to the restriction of rGP particles to the melt flow of molten PP. The morphological analysis found that the PP/rGP composites with higher amounts of filler content were highly agglomerated and formed conductivity paths within the PP matrix. the increase of rGP content highly improved the thermal stability of composite. The findings of this study show that the rGP has the potential to be used as a conductive filler for producing conductive composite material.

Item Type: Article
Uncontrolled Keywords: Recycled graphite; Polypropylene; Conductive polymer composite
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Mechanical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 09 May 2022 03:20
Last Modified: 09 May 2022 03:20

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