Study of the dielectric heating of graphite oxide and its effect on the microwave‐assisted synthesis of Nylon‐6/graphite oxide polymeric hybrid nanocomposites

The present research focuses on the study of the microwave dielectric heating (DH) of graphite oxide (GrO) during the synthesis of Nylon‐6/GrO hybrid polymeric nanocomposites (HPNCs) employing different microwave input powers and two GrO morphologies. In this regard, we evaluated GrO powder (GrOP) w...

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Published in:Journal of applied polymer science 2022-02, Vol.139 (5), p.n/a
Main Authors: Ledezma‐Rodríguez, Raquel, Hernández, Ernesto Hernández, Yáñez‐Macías, Roberto, Hernández, Zureima García, Zúñiga, Gabriela Yolotzín Romero, Falcón, María Guadalupe García, Gallardo‐Vega, Carlos, Morones, Pablo González
Format: Article
Language:English
Subjects:
Chemical synthesis
composites
Exfoliation
fullerenes
Functional groups
Graphene
Graphite
Heating
Hybridization
Materials science
Morphology
Nanocomposites
nanotubes
Nylon
Oxidation
polyamides
Polymers
Sheets
Thickness
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Summary:The present research focuses on the study of the microwave dielectric heating (DH) of graphite oxide (GrO) during the synthesis of Nylon‐6/GrO hybrid polymeric nanocomposites (HPNCs) employing different microwave input powers and two GrO morphologies. In this regard, we evaluated GrO powder (GrOP) with dimensions ranging from nanometers to microns and GrO films (GrOF) with millimeter lengths and micron thicknesses. Both morphologies show the same oxidation degree and concentration of functional groups. However, they differ in the number of stacked graphene oxide sheets, thus modify their surface area. The results indicated that the morphology of GrO plays a determining role in its DH behavior in the microwave‐assisted polymerization (MAP). On one hand, GrOF contains a high concentration of graphene sheets that induce both an increase in DH and the formation of hot spots. In addition, GrOF has a greater attractive force between its sheets, since its interlamellar space is smaller than 8.4 Å, which makes its exfoliation more difficult. The aforementioned effects significantly reduce the exfoliation and hybridization of GrOF. On the other hand, the larger interlamellar spacing in GrOP weakens the attractive forces compared to GrOF. The lower concentration of graphene oxide lamellae prevents the formation of hot spots, and homogeneously dissipates DH in the reaction medium, maximizing its exfoliation and hybridization. In addition, its behavior presents a defined trend concerning time. These results highlight the importance of considering the GrO morphology in the synthesis of HPNCs as it globally affects the MAPs process, as well as GrO reduction, exfoliation, and hybridization.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.51567