This paper reports the measurement of the thermal conductivity of particle-laden polymeric thermal interface materials for three different particle volume fractions. The experimental data are further compared with the percolation model and effective medium theory. We then introduce a method of obtaining the contact resistance between the particles and the polymeric matrix by a combination of percolation modeling and experimental data. We also discuss the dependence of the mechanical response of these particle-laden polymers for different filler or particle loading. A novel mechanical length scale is defined to understand the mechanical response of these materials, and is correlated to the viscosity of these materials.

Issue Section:
Technical Papers
Keywords:
thermal conductivity, contact resistance, filled polymers, shear modulus, percolation
Topics:
Contact resistance, Particulate matter, Thermal conductivity, Percolation theory, Stiffness, Modeling, Polymers, Fillers (Materials)
1.
Prasher
,
R. S.
,
2001
, “
Surface Chemistry Based Model for the Thermal Contact Resistance of Fluidic Interstitial Thermal Interface Materials
,”
J. Heat Transfer
,
123
, pp.
969
–
975
.
2.
Suddith
,
R. D.
,
1993
, “
A Generalized Model to Predict the Viscosity of Solutions With Suspended Patilcles. 1
,”
J. Appl. Polym. Sci.
,
48
, pp.
25
–
36
.
3.
Madhusudana, C. V., 1996, Thermal Contact Conductance, Springer-Verlag, New York.
4.
Solbrekken, G., Chiu, C.-P., Byers, B., and Reichenbacher, D., 2000, “The Development of a Tool to Predict Package Level Thermal Interface Material Performance,” The Seventh Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, Vol. 2, pp. 48–54.
5.
Taylor, B. N., and Kuyatt, C. E., 1994, “Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results,” NIST Technical Note 1297, United States Department of Commerce, Washington, DC.
6.
Holman, J. P., 1994, Experimental Methods for Engineers, McGraw-Hill, New York.
7.
Lewis
,
T. B.
, and
Nielsen
,
L. E.
,
1970
, “
Dynamic Mechanical Properties of Particulate Filled Composites
,”
J. Appl. Polym. Sci.
,
14
, pp.
1449
–
1471
.
8.
Devpura, A., Phelan P. E., and Prasher, R. S., 2000, “Percolation Theory Applied to Study the Effect of Shape and Size of the Filler Particles in Thermal Interface Materials,” Proceedings of the ASME, HTD-Vol. 366-4, Heat Transfer Division-2000, Vol. 4, J. H. Kim, Principal Editor, pp. 365–371.
9.
Progelhof
,
R. C.
,
Throne
,
J. L.
, and
Ruetsch
,
R. R.
,
1976
, “
Methods for Predicting the Thermal Conductivity of Composite Systems: A Review
,”
Polym. Eng. Sci.
,
16
, pp.
615
–
625
.
10.
Xu
,
Y.
,
Luo
,
X.
, and
Chung
,
D. D. L.
,
2000
, “
Sodium Silicate Based Thermal Interface Material for High Thermal Contact Conductance
,”
J. Electron. Packag.
,
122
, pp.
128
–
131
.
11.
Irvine, T. F., 1998, Handbook of Heat Transfer, 3rd ed., Rohsenow, W. M., Hartnett, J. P., and Cho, Y. I., eds., McGraw-Hill Professional, New York, p. 2.51.
12.
Devpura
,
A.
,
Phelan
,
P. E.
, and
Prasher
,
R. S.
,
2001
, “
Size Effects on the Thermal Conductivity of Polymers Laden With Highly Conductive Filler Particles
,”
J. Microscale Thermophys. Eng.
,
5
, pp.
177
–
189
.
13.
Prasher, R. S., Alger, O., and Phelan, P. E., 2001, “A Unified Macroscopic and Microscopic Approach to Contact Conduction Heat Transfer,” Proc. 35th National Heat Transfer Conference, Anaheim, California.
14.
Ball, R. C., and Richmond, P., 1980, “Dynamics of Colloidal Dispersion,” Vol. 9, no. 2, pp. 99–116.
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