Recycled-copper-filled epoxy composites: the effect of mixed particle size

Mohamad Nur Fuadi Pargi,Cheow Keat Yeoh,Pei Leng Teh,Salmah Hussiensyah,Supri Abd Ghani

doi:10.1186/s40712-015-0030-2

Mohamad Nur Fuadi Pargi, Cheow Keat Yeoh + Show 3 more

Open Access

https://doi.org/10.1186/s40712-015-0030-2

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Abstract

The effect of mixed size of recycled-copper-filled epoxy composites on mechanical, electrical, thermal and physical properties was investigated. The recycled copper was collected as a waste from the milling machine. The recycledcopper-filled epoxy composite was mixed using a mechanical stirrer. The effect of volume fraction of recycled copper of the epoxy composites were studied based on the flexural properties, coefficient of thermal analysis (CTE), electrical conductivity, hardness and density. The incorporation of recycled copper has decreased the CTE of the composites. The flexural properties, electrical conductivity, hardness and density of the composites increased with increasing volume fraction and filler loading.

Highlights

The effect of mixed size of recycled-copper-filled epoxy composites on mechanical, electrical, thermal and physical properties was investigated
The electrical conductivity is the reverse of the resistivity values; it can be measured by using a GDM 352A multimeter (GW Instek America Corp, Chino, CA, USA) with a sample dimension of 1-cm diameter and 0.3-cm thickness
Recycled copper particle size In this research, the recycled copper waste chips that were collected from the milling machine were milled into powders for two sets of milling hours which were 24 and 72 h at a speed of 250 rpm

Summary

Background

Conductive polymer has received considerable interest as a solder replacement in flip chip packaging because there is a significant reduction in pitch, weight and volume and increased environmental compatibility (Sun 2001). The reinforcement phases, especially the metal particles in epoxy resin, are usually discrete particles, which lead to discontinuous heat conduction paths (Ji et al 2014) Factors such as the size, shape, chemistry and aggregation behaviour of filler particles must be considered in conjunction with the thermodynamic and rheological properties of the polymer matrix and the processing conditions employed (Burden et al 1998). Polymer composites filled with metal are of interest for use; one main parameter determining CPC properties is the conductive pathway structure, depending on many parameters such as filler content (φ), surface free energy of the filler and the matrix, crystallinity, reticulation and exclusion volume, i.e. zones where carbon black is concentrated (Gazotti et al 1999). Epoxy matrix composites are prone to impact damage which includes failure modes such as transverse cracking, delamination, fibre/matrix debonding and fibre fracture, all limiting their uses for many structural applications (Wong et al 2010)

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Results and discussion

Conclusions