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Thermal Interface Materials with Hexagonal Boron Nitride and Graphene Fillers in PDMS Matrix: Thermal and Mechanical Properties

Fakiridis, Spyridon, Hodge, Stephen A. and Karagiannidis, Panagiotis (2023) Thermal Interface Materials with Hexagonal Boron Nitride and Graphene Fillers in PDMS Matrix: Thermal and Mechanical Properties. Energies, 16 (6). pp. 1-17. ISSN 1996-1073

Item Type: Article


This work studies the effects of graphene nanoplatelets (GNPs) and hexagonal boron nitride
(hBN) on the thermal and mechanical properties of polydimethylsiloxane (PDMS) matrix for use as
thermal interface materials (TIMs). Solution mixing of 10 wt% GNPs and 40 wt% hBN with PDMS
produced TIMs with through-plane thermal conductivity (TC) of 1.24 W m−1 K−1
showing a 519%
increase relative to the neat matrix. A synergistic effect between GNPs and hBN was particularly
demonstrated when in samples with 48 wt% total filler content, 8 wt% hBN was replaced by GNPs,
and the TC was increased by 33%. The elongation at break of the hBN (40 wt%)/GNP (8 wt%) samples
reached 151%, representing a 160% increase when compared to samples with only 40 wt% hBN.
Moreover, the shore hardness of samples containing 40 wt% hBN was 68 A, and the introduction of 8
wt% GNPs caused a decrease to 38 A. DSC measurements on samples filled with hBN and GNPs
showed a reduction up to 65% in Ultimate Heat of Curing, which was attributed to the presence of
graphene flakes interfering with the curing of the matrix. Graphene was found to be an efficient filler
in tuning the thermal and mechanical properties of TIMs.

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Uncontrolled Keywords: graphene; hexagonal boron nitride; PDMS; thermal interface materials; mechanical properties; curing inhibition; elastomers
Depositing User: Panagiotis Karagiannidis


Item ID: 15792
Identification Number:
ISSN: 1996-1073
Official URL:

Users with ORCIDS

ORCID for Panagiotis Karagiannidis: ORCID iD

Catalogue record

Date Deposited: 15 Mar 2023 15:27
Last Modified: 20 Mar 2023 11:15


Author: Panagiotis Karagiannidis ORCID iD
Author: Spyridon Fakiridis
Author: Stephen A. Hodge

University Divisions

Faculty of Technology


Engineering > Mechanical Engineering
Engineering > Thermodynamics

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