Abstract
Thermal conductivity of bulk polymers can be enhanced by strain-induced oriented crystallization. This work reports a three-step solution-free fabrication process to promote a polymer film’s molecular chain alignment. First, the mobility of molecular chain is promoted by equilibrating the film at an elevated temperature. Second, the film is mechanically drawn at controlled strain level, strain rate, and temperature. Third, the stretched film is rapidly cooled to stabilize its microstructure. Parametric studies have identified that promoting intermolecular fringed-micelles with preferential orientation without unfolding the intramolecular folded-chain nucleus can maximize its in-plane thermal conductivity.
Highlights
In the past few decades, thermally conductive polymer material systems have drawn a lot attention due to their superior electrical insulation property, light weight, low cost, and good processability
The high filler loading significantly compromises some of the key benefits, such as light weight and good processability, of using polymers for electronic packaging and thermal management applications
Leung et al showed that ultra-drawn liquid crystal polymer (LCP)-GnP nanocomposites promoted fibrillation of LCP and alignment of GNP, both enhanced polymer matrix composites (PMC)’s keff
Summary
In the past few decades, thermally conductive polymer material systems have drawn a lot attention due to their superior electrical insulation property, light weight, low cost, and good processability. Strain-induced oriented crystallization of UHMWPE: Enhanced thermal conductivity through molecular chain alignment The UHMWPE films were stretched under three strain levels (i.e., 1.0, 2.5, and 3.0), two strain rates (i.e., 2.5 mm/min and 300.8 mm/min), and two processing temperatures (i.e., 130◦C and 140◦C).
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