Conductivity and percolation in polymeric particulate composites of epoxy resin and conductive fillers

1996 ◽  
Author(s):  
G.M. Tsangaris
Keyword(s):  
Epoxy Resin ◽  
Particulate Composites ◽  
Conductive Fillers

Additive manufacturing of composites made of epoxy resin with magnetite particles fabricated with the direct ink writing technique

2019 ◽  
Vol 54 (5) ◽  
pp. 647-657 ◽  
Author(s):  
Jose J Restrepo ◽  
Henry A Colorado
Keyword(s):  
Additive Manufacturing ◽  
Epoxy Resin ◽  
Large Scale ◽  
Distribution Density ◽  
Particulate Composites ◽  
Resin Matrix ◽  
Direct Ink Writing ◽  
Composites Materials ◽  
Structural Applications ◽  
Magnetite Particles

In this investigation, particulate composites materials made of epoxy resin matrix with magnetite particles were fabricated via additive manufacturing with the direct ink writing technique. Magnetite is an inexpensive material and the direct ink writing process is not only inexpensive but also easy to adapt to any material. A total of eight formulations were investigated, from which only four were feasible for the printing process: 32.6, 33.6, 35.4 and 41 wt.% of particles. The composites were characterized by scanning electron microscopy, compressive strength, particle size distribution, density, and ductility. Results showed that composites exhibit very competitive mechanical properties even though the process was not vacuum assisted, therefore enabling them to be used in large scale and in other structural applications. Composite can be used in electromagnetic shielding.

scholarly journals DC and AC Conductivity in Polymeric Particulate Composites of Epoxy Resin and Metal Particles

1999 ◽  
Vol 8 (1) ◽  
pp. 096369359900800 ◽  
Author(s):  
G.M. Tsangaris ◽  
G.C. Psarras ◽  
E. Manolakaki
Keyword(s):  
Activation Energy ◽  
Epoxy Resin ◽  
Ac Conductivity ◽  
Critical Frequency ◽  
Nickel Powder ◽  
Temperature Shift ◽  
Conductive Filler ◽  
Particulate Composites ◽  
Nickel Particles ◽  
Dc And Ac Conductivity

The DC and AC conductivity of composites with epoxy resin and nickel particles was investigated for various content of nickel powder from ambient to 120 °C. AC conductivity was measured in the frequency range 10 Hz to 13 MHz. An enhancement of conductivity was evidenced increasing conductive filler content and temperature. AC conductivity was found to be frequency dependent beyond a critical frequency ω c. The activation energy of the temperature shift of ω c was compared to the activation energy of DC conductivity.

scholarly journals Modelling the Dielectric Behaviour of Composites of Epoxy Resin and Kevlar Fibres

1995 ◽  
Vol 4 (6) ◽  
pp. 096369359500400 ◽  
Author(s):  
G.M. Tsangaris ◽  
G.C. Psarras ◽  
N. Kouloumbi
Keyword(s):  
Experimental Data ◽  
Aspect Ratio ◽  
Epoxy Resin ◽  
Satisfactory Agreement ◽  
Volume Fraction ◽  
Polymeric Composites ◽  
Dielectric Behaviour ◽  
Wide Range ◽  
Conductive Fillers ◽  
Logarithmic Law

The logarithmic law of mixtures can be suitably extended to form equations which can describe the dielectric behaviour of polymeric composites containing non conductive fillers. The proposed equations can give the permittivity and loss of the composites as a function of the permittivities of the constituents, the volume fraction of the inclusions and their aspect ratio. The proposed equation are tested with experimental data obtained in a wide range of frequency and temperature from composites with epoxy resin and Kevlar fibres. Satisfactory agreement is observed and existing discrepancies must be attributed to the intrinsic weakness of the logarithmic law of mixtures on which the proposed equations are based.

scholarly journals Dielectric Response during Cure of Particulate Composites of Epoxy Resin and Nickel Particles

1995 ◽  
Vol 4 (3) ◽  
pp. 096369359500400
Author(s):  
G.M Tsangaris ◽  
G.M. Maistros
Keyword(s):  
Epoxy Resin ◽  
Metal Powder ◽  
Dielectric Response ◽  
Interfacial Polarization ◽  
Metal Particles ◽  
Particulate Composites ◽  
Cure Process ◽  
Low Frequencies ◽  
Nickel Particles ◽  
Polarization Phenomena

The cure process of particulate composites consisting of an epoxy resin and nickel particles, was monitored dielectrically. The inclusion of metal powder in the resin causes a delay in the cure process. It also adds considerable conductivity and after gelation interfacial polarization phenomena are evidenced in the low frequencies, because of the interfaces introduced by the metal particles.

Radiation induced effects on particulate composites from epoxy resin and fly-ash

1998 ◽  
Vol 52 (1-6) ◽  
pp. 187-191 ◽  
Author(s):  
S. Baccaro ◽  
B. Bianchilli ◽  
C. Casadio ◽  
G. Rinaldi
Keyword(s):  
Fly Ash ◽  
Epoxy Resin ◽  
Particulate Composites ◽  
Radiation Induced
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