Abstract
By adding 2 wt% multi-layer graphene oxide (MGO) to an epoxy resin, the thermal conductivity of the composite reached a maximum, 2.03 times that of the epoxy. The presence of 2 wt%MGO percolating chains leads to an unprecedentedly 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 gradient 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 conductivity 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.
| Original language | English |
|---|---|
| Pages (from-to) | 608-623 |
| Number of pages | 16 |
| Journal | Express Polymer Letters |
| Volume | 9 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2015 |
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Keywords
- Graphene oxide
- Nanocomposites
- Polymer composites
- Thermal properties
ASJC Scopus subject areas
- Polymers and Plastics
- Materials Chemistry
- Chemical Engineering(all)
- Organic Chemistry
- Physical and Theoretical Chemistry
Cite this
Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains. / Zhou, T.; Koga, H.; Nogi, M.; Sugahara, T.; Nagao, S.; Nge, T. T.; Suganuma, K.; Cui, H. W.; Liu, F.; Nishina, Yuta.
In: Express Polymer Letters, Vol. 9, No. 7, 2015, p. 608-623.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains
AU - Zhou, T.
AU - Koga, H.
AU - Nogi, M.
AU - Sugahara, T.
AU - Nagao, S.
AU - Nge, T. T.
AU - Suganuma, K.
AU - Cui, H. W.
AU - Liu, F.
AU - Nishina, Yuta
PY - 2015
Y1 - 2015
N2 - By adding 2 wt% multi-layer graphene oxide (MGO) to an epoxy resin, the thermal conductivity of the composite reached a maximum, 2.03 times that of the epoxy. The presence of 2 wt%MGO percolating chains leads to an unprecedentedly 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 gradient 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 conductivity 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.
AB - By adding 2 wt% multi-layer graphene oxide (MGO) to an epoxy resin, the thermal conductivity of the composite reached a maximum, 2.03 times that of the epoxy. The presence of 2 wt%MGO percolating chains leads to an unprecedentedly 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 gradient 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 conductivity 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.
KW - Graphene oxide
KW - Nanocomposites
KW - Polymer composites
KW - Thermal properties
UR - http://www.scopus.com/inward/record.url?scp=84928995260&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84928995260&partnerID=8YFLogxK
U2 - 10.3144/expresspolymlett.2015.57
DO - 10.3144/expresspolymlett.2015.57
M3 - Article
AN - SCOPUS:84928995260
VL - 9
SP - 608
EP - 623
JO - Express Polymer Letters
JF - Express Polymer Letters
SN - 1788-618X
IS - 7
ER -