Amine functionalization on thermal and mechanical behaviors of graphite nanofib ers-loade d epoxy composites

초록

With the growing demand for faster and more powerful computing, effective heat dissipation is essen-tial to ensure the longevity, reliability, and high performance of electronic systems. In the field of mod-ern electronic packaging materials, there is a great need for graphitic material-loaded polymeric com-posites (GPCs) with excellent thermal conductivities. However, the enhancement efficiency of GPCs is hindered by the agglomeration of fillers and the interfacial thermal resistance caused by the lack of continuous thermally conductive pathways between the filler and matrix. Understanding the interfaces between filler and matrix is of great importance in optimizing the performances of GPCs. Here, we fabri-cated graphite nanofibers (GNF)-loaded nanocomposites using acid-functionalized GNF (AGNF) and acid-tetraethylenepentamine-functionalized (TGNF) as a filler and epoxy resin as a matrix with different GNF loading contents to explore the interfacial properties of the nanocomposites. The optimal GNF loading for AGNF was 0.5 wt.%, while the TGNF showed 0.75 wt.%. The highest thermal conductivity (0.51 W m -1 K -1) and fracture toughness (25.8 MPa m1/2) values were found in the TGNF-loaded nanocomposites with a fraction of 0.75 wt.%, representing enhancements of similar to 145% and similar to 400%, respectively, compared to those of neat nanocomposites. The experimental data presented herein demonstrate that the inter-facial properties play a significant role in enhancing the thermal and mechanical performances of the nanocomposites. The present approach is expected to serve as a valuable tool in the design of conduc-tive polymeric nanocomposites for further practical applications, such as thermal interface materials and packaging of high-power electric devices.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

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