380
L. L. Vovchenko et al.
Table 24.1 Morphology of
the polymer composite fillers
GNPs
CNTs
Shape of particles Plates
Cylinders
Length of particles
10–30 μm
Diameter
0.2–30 μm 10–30 nm
Thickness
5–65 nm
Aspect ratio AR
40–460
1000
Packing factor F
0.05
0.06
Table 24.2 Phase composition of epoxy composites
Type of composite nanocarbon/L285
Total content of filler, wt.%
GNP:CNT 1:0
1; 2; 4; 6; 7
GNP:CNT 3:1
1; 2; 3; 4
GNP:CNT 1:1
0,3; 2; 3; 4
subjected to ultrasound action (in BAKU 9050 ultrasonic cleaner, 40 kHz, 50 W), for
15 min in the case of GNP filler and for 45 min in the case of MWCNT filler. After
H285 hardener (based on polyamine) was added to the liquid composite mixture of
0–7 wt.%, GNP- or GNP/CNT/L285 and carefully mixed and then poured into a
mold made of a nonmagnetic polymer material. The curing of the composite was
performed in two stages: under normal conditions in air during a day with next final
drying of cured composite sample at stepwise increasing temperature from 40 to
80 ◦ ´ during 5 h.
Table 24.2 presents the composition of carbon filler in fabricated epoxy composites.
Scanning electron microscopy (SEM) images were performed by using Mira3
TESCAN technique.
The electrical properties of epoxy composites were studied by measuring
impedance spectra at room temperature using Z-2000 impedance meter at ac current
mode in the frequency range from 1 kHz to 2 MHz.
24.3 Results and Discussion
24.3.1 Microstructure of Nanocarbon/Epoxy Composites
It is obvious that the microstructure of developed composites strongly depends on
the content and structure/morphology of filler particles. Figure 24.2 schematically
presents the spatial distribution of nanocarbon filler particles in epoxy matrix before
and after percolation threshold.
As it is seen, GNP particles become uniformly distributed in the bulk of the
epoxy matrix (Fig. 24.2a), and great quantity of contacts between graphite particles
through polymer interlayer appears in the infinite cluster form of GNP particles
L. L. Vovchenko et al.
Table 24.1 Morphology of
the polymer composite fillers
GNPs
CNTs
Shape of particles Plates
Cylinders
Length of particles
10–30 μm
Diameter
0.2–30 μm 10–30 nm
Thickness
5–65 nm
Aspect ratio AR
40–460
1000
Packing factor F
0.05
0.06
Table 24.2 Phase composition of epoxy composites
Type of composite nanocarbon/L285
Total content of filler, wt.%
GNP:CNT 1:0
1; 2; 4; 6; 7
GNP:CNT 3:1
1; 2; 3; 4
GNP:CNT 1:1
0,3; 2; 3; 4
subjected to ultrasound action (in BAKU 9050 ultrasonic cleaner, 40 kHz, 50 W), for
15 min in the case of GNP filler and for 45 min in the case of MWCNT filler. After
H285 hardener (based on polyamine) was added to the liquid composite mixture of
0–7 wt.%, GNP- or GNP/CNT/L285 and carefully mixed and then poured into a
mold made of a nonmagnetic polymer material. The curing of the composite was
performed in two stages: under normal conditions in air during a day with next final
drying of cured composite sample at stepwise increasing temperature from 40 to
80 ◦ ´ during 5 h.
Table 24.2 presents the composition of carbon filler in fabricated epoxy composites.
Scanning electron microscopy (SEM) images were performed by using Mira3
TESCAN technique.
The electrical properties of epoxy composites were studied by measuring
impedance spectra at room temperature using Z-2000 impedance meter at ac current
mode in the frequency range from 1 kHz to 2 MHz.
24.3 Results and Discussion
24.3.1 Microstructure of Nanocarbon/Epoxy Composites
It is obvious that the microstructure of developed composites strongly depends on
the content and structure/morphology of filler particles. Figure 24.2 schematically
presents the spatial distribution of nanocarbon filler particles in epoxy matrix before
and after percolation threshold.
As it is seen, GNP particles become uniformly distributed in the bulk of the
epoxy matrix (Fig. 24.2a), and great quantity of contacts between graphite particles
through polymer interlayer appears in the infinite cluster form of GNP particles