Thermal conductivity of glasses: A structural point of view

Abstract

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Research progress of intrinsic polymer dielectrics with high thermal conductivity

“…Crystallisation occurs spontaneously under proper heat treatments, thus generating an isotropic low TC because of the randomly oriented crystals. If crystal domains are not orientated, the amorphous zones between crystalline regions will serve as the dominant phonon scattering centres due to high interfacial thermal resistance as indicated in Figure 6a [48]. In order to reasonably explain the TC of polymers with high crystallinity (i.e., >83%), the crystal domains orientation and distribution, the crystallineamorphous interface, as well as the TC of the amorphous region acting as the bridge (tie) molecules between two neighbouring crystallites must be given full considerations [10].…”

“…Considering the plane wave nature of phonon, phonon transport would be strongly affected by the disordered and entangled structures of amorphous polymers [51] and cannot propagate far generally less than 10 nm. Together with other inherent defects, such as impurities, voids, chain ends and entanglements, these effects result in rather low TC [48], which falls within a small range of 0.1-0.3 W/(m⋅K). A typical strategy employed to engineering TC of polymers is to suppress and reduce structural disorder, weak bonding and anharmonicity, imperfections.…”