Back to Search
Start Over
Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains
- Source :
- eXPRESS Polymer Letters, Vol 9, Iss 7, Pp 608-623 (2015)
- Publication Year :
- 2015
- Publisher :
- Department of Polymer Engineering, Scientific Society of Mechanical Engineering, 2015.
-
Abstract
- By adding 2 wt% multi-layer graphene oxide (MGO) to an epoxy resin, the thermal conductivity of the compos- ite reached a maximum, 2.03 times that of the epoxy. The presence of 2 wt%MGO percolating chains leads to an unprece- dentedly sharp rise in energy barrier at final curing stage, but an increased epoxy curing degree (!IR) is observed; however, this !IR difference nearly disappears after aging or thermal annealing. These results suggest that the steep concentration gra- dient of -OH, originated from the 2 wt%MGO percolating chains, exerts the vital driving force on the residual isolated/ trapped epoxy to conquer barrier for epoxy-MGO reaction. A modified Shrinking Core Model customized for the special layered-structure of MGO sheet was proposed to understand the resistance variation during the intercalative epoxy-MGO reaction. It shows that the promoted intercalative crosslinking is highly desirable for further improving the thermal conduc- tivity of the composite, but it meets with increased resistance. Guided by the kinetic studies, targeted optimization on the cure processing strategy was accordingly proposed to promote the intercalative crosslinking, a thermal conductivity, 2.96 times that of the epoxy, was got with only a small amount (30°C) increase of the post-heating temperature.
- Subjects :
- Materials science
Polymers and Plastics
General Chemical Engineering
Composite number
Oxide
lcsh:Chemical technology
law.invention
chemistry.chemical_compound
Thermal conductivity
law
nanocomposites
Thermal
lcsh:TA401-492
Materials Chemistry
lcsh:TP1-1185
Physical and Theoretical Chemistry
Composite material
Curing (chemistry)
Polymer composites
Nanocomposite
Graphene
thermal properties
Organic Chemistry
Epoxy
chemistry
visual_art
visual_art.visual_art_medium
graphene oxide
lcsh:Materials of engineering and construction. Mechanics of materials
Subjects
Details
- ISSN :
- 1788618X
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Express Polymer Letters
- Accession number :
- edsair.doi.dedup.....009263d04cb54f3386f79fd15b25e574