Abstract
Filler loading effects in both the thermal stability (TS) and thermal conductivity (TC) of ED-20 epoxy filled with bare (MLG) or oxidized multi-layered graphene nanoplatelets (MLGO) have been experimentally and theoretically studied. The particles were of about 5 × 5 μm in lateral size, about 50 nm in thickness, and of the specific surface area ~ 790 m2/g. The filler’s mass loading varied from 0.5 to 5.0%. TS studies have been performed by the temperature-programmed desorption technique with mass spectrometric detection of volatile moieties. The TC has been measured using the ASTM C1114 standard test method and modeled by equilibrium molecular dynamics simulations via LAMMPS package. TS has proved to be enhanced in MLG nanocomposites and deteriorated when using MLGO fillers, compared to those of the neat epoxy. For both the MLG and MLGO nanocomposites, volatile-moiety outputs showed non-monotonous loading dependences, whereas TC exhibited monotonic increase with increasing loading. It is shown that the TS and TC can be improved simultaneously in these nanocomposites. The likely involvement of the interfacial interaction mechanisms behind these effects is addressed.
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Abbreviations
- ASS:
-
Active surface state
- AIREBO:
-
Adapted intermolecular reactive empirical bond order
- CLD:
-
Cross-linking degree
- CVFF:
-
Consistent valence force field
- DGEBA:
-
Diglycerol ether bisphenol A
- DSC:
-
Differential scanning calorimetry
- GNPs:
-
Graphene nanoplatelets
- G-PNC:
-
Polymer composites
- LAMMPS:
-
Large-scale atomic/molecular massively parallel simulator
- LJ:
-
Lennard-Jones
- MLG:
-
Multi-layered graphene
- MLGO:
-
Multi-layered graphene oxide
- MLG-NPs:
-
Multi-layered graphene nanoplatelets
- MLGO-NPs:
-
Multi-layered graphene-oxide nanoplatelets
- MD:
-
Molecular dynamics
- PEPA:
-
Polyethylene polyamine
- PESA:
-
Pentaethylenesextamine
- PNC:
-
Polymer nanocomposite
- TEG:
-
Thermally expanded graphite
- TETA:
-
Triethylenetetramine
- TC:
-
Thermal conductivity
- vdW:
-
van der Waals
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Gorelov, B., Gorb, A., Nadtochiy, A. et al. Epoxy filled with bare and oxidized multi-layered graphene nanoplatelets: a comparative study of filler loading impact on thermal properties. J Mater Sci 54, 9247–9266 (2019). https://doi.org/10.1007/s10853-019-03523-7
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DOI: https://doi.org/10.1007/s10853-019-03523-7