Applications of multifunctional polymer-matrix composites in hybrid heat sinks

Leung, Siu N.; Khan, Omer M.; Naguib, Hani E.; Dawson, F.P.; Adinkrah, Vincent

doi:10.1117/12.917242

Cited by 1 publication

(1 citation statement)

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“…A previous study found that the dynamic storage modulus of polymer matrix composites filled with hBN platelet increased sharply at hBN loadings closed to 10 vol %, indicating a sudden change in the material structure (i.e., formation of interconnected filler network). 38 As a result, the lowest filler loading studied in this work was chosen to be 9.21 vol %. The overall procedures to prepare PMC samples for the measurements of their k eff are illustrated in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Development of thermally conductive polymer matrix composites by foaming‐assisted networking of micron‐ and submicron‐scale hexagonal boron nitride

Ding

Guo

Leung

2015

J of Applied Polymer Sci

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Thermally conductive polymer matrix composite (PMC) foams with effective thermal conductivities (k eff ) higher than their solid counterparts have been developed for the first time. Using a material system consists of low density polyethylene and micron-scale or submicron-scale hexagon boron nitride platelets as a case example, this article demonstrates that foaming-assisted filler networking is a feasible processing strategy to enhance PMC's k eff , especially at a low hBN loading. Parametric studies were conducted to identify the structure-to-property relationships between foam morphology (e.g., cell population density, cell size, and foam expansion) and the PMC foam's k eff . In particular, there exists an optimal cell size to maximize the PMC foam's k eff for foams with up to 50% volume expansion. However, an optimal cell size is absent for PMC foams with higher volume expansion. X-ray diffraction (XRD) analyses reveal that both the presence of hBN platelets and foam expansion promoted the crystallization of LDPE phase. Moreover, the XRD spectra also provide evidence for the effect of foam expansion on the orientation of hBN platelets. Overall, the findings provide new directions to design and fabricate thermally conductive PMC foams with low filler contents for heat management applications.

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Section: Methodsmentioning

confidence: 99%