The flash diffusivity method, also known as laser flash analysis (LFA), is commonly used to obtain the thermal diffusivity (α) and thermal conductivity (κ) of materials, due to its relative simplicity, rapid measurements, small sample size requirement, and standardized commercially available instruments. In this work, an epoxy adhesive was filled with a large fraction of homogeneous micron-sized polymethylmethacrylate spheres coated with thin silver films, such that a percolating metallic network that dominated the electric and thermal transport formed through the polymer at <3 vol. % silver. Specific heat capacity (Cp) was measured from the LFA measurements by a comparative method and from the total and reversible heat flow signals of modulated differential scanning calorimetry (MDSC). κ was estimated as the product of α, Cp, and density (ρ) and was found to vary significantly with the method to find Cp. The electron contribution was found from the electrical conductivity by the Wiedemann–Franz law and was used to elucidate the thermal transport mechanisms in the composite. A theoretical background for the various methods is included.

1.
Z.
Han
and
A.
Fina
,
Prog. Polym. Sci.
36
,
914
(
2011
).
2.
A. L.
Moore
and
L.
Shi
,
Mater. Today
17
,
163
(
2014
).
3.
M. J.
Yim
,
Y.
Li
,
K.-S.
Moon
,
K. W.
Paik
, and
C. P.
Wong
,
J. Adhes. Sci. Technol.
22
,
1593
(
2008
).
4.
J. E.
Morris
and
J.
Liu
, in
Micro- and Opto-Electronic Materials and Structures: Physics, Mechanics, Design, Reliability, Packaging
, edited by
E.
Suhir
,
Y. C.
Lee
, and
C. P.
Wong
(
Springer Science+Business Media LLC
,
New York
,
2007
), p.
527
.
5.
D. R.
Lide
,
CRC Handbook of Chemistry and Physics
, 84th ed. (
Taylor & Francis
,
2003
).
6.
M.
Inoue
,
H.
Muta
,
T.
Maekawa
,
S.
Yamanaka
, and
K.
Suganuma
,
J. Electron. Mater.
38
,
430
(
2009
).
7.
J.
Gakkestad
,
L.
Zhuo
,
T.
Helland
, and
C. P.
Wong
,
IEEE 15th Electronics Packaging Technology Conference (EPTC)
(
Singapore
,
2013
), p.
213
.
8.
S. R.
Pettersen
,
H.
Kristiansen
,
S.
Nagao
,
S.
Helland
,
J.
Njagi
,
K.
Suganuma
,
Z.
Zhang
, and
J.
He
,
J. Electron. Mater.
45
,
3734
(
2016
).
9.
S. R.
Pettersen
,
H.
Kristiansen
,
K.
Redford
,
S.
Helland
,
E.
Kalland
,
Z.
Zhang
, and
J.
He
,
IEEE 66th Electronic Components and Technology Conference (ECTC)
(
2016
), p.
2494
.
10.
S. R.
Pettersen
,
A. E.
Stokkeland
,
H.
Kristiansen
,
J.
Njagi
,
K.
Redford
,
D. V.
Goia
,
Z.
Zhang
, and
J.
He
,
Appl. Phys. Lett.
109
,
043103
(
2016
).
11.
S.
Jain
, Ph.D. thesis, Loughborough University, UK,
2016
.
12.
K. A.
Borup
,
J.
De Boor
,
H.
Wang
,
F.
Drymiotis
,
F.
Gascoin
,
X.
Shi
,
L.
Chen
,
M. I.
Fedorov
,
E.
Müller
, and
B. B.
Iversen
,
Energy Environ. Sci.
8
,
423
(
2015
).
13.
W. J.
Parker
,
R. J.
Jenkins
,
C. P.
Butler
, and
G. L.
Abbott
,
J. Appl. Phys.
32
,
1679
(
1961
).
14.
ASTM E1461-13
,
Standard Test Method for Thermal Diffusivity by the Flash Method
(
ASTM International
,
West Conshohocken, PA, USA
,
2013
).
15.
W.
Nunes dos Santos
,
P.
Mummery
, and
A.
Wallwork
,
Polym. Test.
24
,
628
(
2005
).
16.
S.
Ganguli
,
A. K.
Roy
, and
D. P.
Anderson
,
Carbon
46
,
806
(
2008
).
17.
W. S.
Lee
and
J.
Yu
,
Diamond Relat. Mater.
14
,
1647
(
2005
).
18.
S.
Yu
,
J.-W.
Lee
,
T. H.
Han
,
C.
Park
,
Y.
Kwon
,
S. M.
Hong
, and
C. M.
Koo
,
ACS Appl. Mater. Interfaces
5
,
11618
(
2013
).
19.
K.
Zhang
,
Y.
Zhang
, and
S.
Wang
,
Carbon
65
,
105
(
2013
).
20.
P. S.
Gill
,
S. R.
Sauerbrunn
, and
M.
Reading
,
J. Therm. Anal.
40
,
931
(
1993
).
21.
S. L.
Simon
,
Thermochim. Acta
374
,
55
(
2001
).
22.
G. V.
Chester
and
A.
Thellung
,
Proc. Phys. Soc.
77
,
1005
(
1961
).
23.
N.
Stojanovic
,
D.
Maithripala
,
J.
Berg
, and
M.
Holtz
,
Phys. Rev. B
82
,
075418
(
2010
).
24.
J. F.
Kerrisk
,
J. Appl. Phys.
42
,
267
(
1971
).
25.
J. F.
Kerrisk
,
J. Appl. Phys.
43
,
112
(
1972
).
26.
H. J.
Lee
and
R. E.
Taylor
,
J. Appl. Phys.
47
,
148
(
1976
).
27.
T. Y. R.
Lee
and
R. E.
Taylor
,
J. Heat Transfer
100
,
720
(
1978
).
28.
R. D.
Cowan
,
J. Appl. Phys.
32
,
1363
(
1961
).
29.
R. D.
Cowan
,
J. Appl. Phys.
34
,
926
(
1963
).
30.
L. M.
Clark
 III
and
R. E.
Taylor
,
J. Appl. Phys.
46
,
714
(
1975
).
31.
H.
Wang
,
W. D.
Porter
,
H.
Böttner
,
J.
König
,
L.
Chen
,
S.
Bai
,
T. M.
Tritt
,
A.
Mayolet
,
J.
Senawiratne
,
C.
Smith
,
F.
Harris
,
P.
Gilbert
,
J.
Sharp
,
J.
Lo
,
H.
Kleinke
, and
L.
Kiss
,
J. Electron. Mater.
42
,
1073
(
2013
).
32.
ASTM E1269-11
,
Standard Test Method for Determining Specific Heat Capacity by Differential Scanning Calorimetry
(
ASTM International
,
West Conshohocken, PA, USA
,
2011
).
33.
E.
Verdonck
,
K.
Schaap
, and
L. C.
Thomas
,
Int. J. Pharm.
192
,
3
(
1999
).
34.
ASTM E2716-09
,
Standard Test Method for Determining Specific Heat Capacity by Sinusoidal Modulated Temperature Differential Scanning Calorimetry
(
ASTM International
,
West Conshohocken, PA, USA
,
2014
).
35.
C.
Song
,
P.
Wang
, and
H. A.
Makse
,
Nature
453
,
629
(
2008
).
36.
R.
Holm
,
Electric Contacts: Theory and Application
, 4th ed. (
Springer-Verlag
,
Berlin/Heidelberg/New York
,
1967
).
37.
C. T.
Moynihan
,
A. J.
Easteal
,
J.
Wilder
, and
J.
Tucker
,
J. Phys. Chem.
78
,
2673
(
1974
).
38.
J. R.
Taylor
,
An Introduction to Error Analysis: The Study of Uncertainty in Physical Measurements
, 2nd ed. (
University Science Books
,
Sausalito, CA, USA
,
1997
).

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