Guangxin Lv, Xiaoru Li, Elynn Jensen, Bhaskar Soman, Yu-Hsuan Tsao, Christopher M. Evans* and David G. Cahill*,
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Polymers are under increasing demand as thermal management materials for electronic devices such as integrated circuits and electrical machines. However, the intrinsic thermal conductivity of polymers is typically low, around 0.2 W/(m K). Although crystallinity is qualitatively known to have a positive correlation with thermal conductivity, the quantitative relationship is unclear because, in most cases, changes in crystallinity are accompanied by differences in the chemical structure of the polymer. In this work, vitrimers with a fixed chemical structure and slow crystallization kinetics are investigated to reveal the relationships between crystallinity and various physical properties relevant to heat transport. As slow crystallization occurs over the span of one week, the physical properties of the vitrimers also evolve. Changes in thermal conductivity are dramatic from 0.10 to 1.0 W/(m K). Quantitative relationships among crystallinity, thermal conductivity, speed of sound, and chain conformation are elucidated by a combination of in situ measurements.
期刊介绍:
Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.