Abstract
Mussel-inspired approach was attempted to non-covalently functionalize the surfaces of boron nitride (BN) with self-polymerized dopamine coatings in order to reduce the interfacial thermal barrier and enhance the thermal conductivity of BN-containing composites. Compared to the polypropylene (PP) composites filled with pristine BN at the same filler content, thermal conductivity was much higher for those filled with both functionalized BN (f-BN) and maleic anhydride grafted PP (PP-g-ma) due to the improved filler dispersion and better interfacial filler-matrix compatibility, which facilitated the development of more thermal paths. Theoretical models were also applied to predict the composite thermal conductivity in which the Nielsen model was found to fit well with the experimental results, and the estimated effective aspect ratio of fillers well corresponded to the degree of filler aggregation as observed in the morphological study.
Highlights
For heat transfer related applications such as anti-corrosion heat exchanger [1, 2], thermal interface materials [3,4,5] and heat sinks in electronic devices [6, 7], thermally conductive fillers have been employed to improve the thermal conductivity (TC) of polymeric materials [8, 9]
SEM analysis was first performed on pristine h-boron nitride (BN) and functionalized BN (f-BN) to study the coating of hexagonal BN (h-BN) with self-polymerized dopamine
Compared to that of h-BN, the broad absorption bands at 3200–3700 cm-1 become much stronger for f-BN, which may be due to the stretching vibration of -OH and– NH groups of polydopamine [36]
Summary
For heat transfer related applications such as anti-corrosion heat exchanger [1, 2], thermal interface materials [3,4,5] and heat sinks in electronic devices [6, 7], thermally conductive fillers have been employed to improve the thermal conductivity (TC) of polymeric materials [8, 9]. Phonon scattering is mainly due to the existence of an interfacial thermal barrier, which results from the acoustic mismatch or the damage of surface layer between the filler and polymer matrix [20, 25].
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