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- Title
Improved thermal conductivity of epoxy resins using silane coupling agent‐modified expanded graphite.
- Authors
Jiang, Di; Chu, Na; Zhang, Yue; Wang, Wei‐Dong; Jin, Fan‐Long; Park, Soo‐Jin
- Abstract
A silane coupling agent was used to modify the surface of expanded graphite (EG), which was subsequently used as a thermally conductive filler to fabricate diglycidylether of bisphenol‐A (DGEBA)/EG composites with high thermal conductivity via hot blending and compression‐curing processes. The surface characteristics of silane coupling agent‐modified EG (Si@EG) were characterized by a variety of analytical techniques. The effects of the Si@EG content on the thermal conductivity, thermal stability, impact strength, and morphology of the DGEBA/Si@EG composites were investigated. The results revealed that the addition of 80 wt.% Si@EG increased the thermal conductivity of the composites from 0.17 to 10.56 W/m K, which was 61.1 times higher than that of pristine DGEBA. The initial decomposition temperature of the composite containing 80 wt.% Si@EG was 60.6°C higher than that of pristine DGEBA. The impact strength of the composites decreased from 2.0 to 0.87 kJ/m2 when the Si@EG content increased from 0 to 80 wt.%. The scanning electron microscopy images of the fractured surfaces revealed that the EG sheets in the DGEBA matrix formed a continuous thermally conductive path at high Si@EG contents.
- Subjects
THERMAL conductivity; SILANE coupling agents; GRAPHITE; THERMAL stability; IMPACT strength; SILANE; EPOXY resins
- Publication
Journal of Applied Polymer Science, 2023, Vol 140, Issue 5, p1
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.53417