De-Long Li, Chun-Yan Liu, Yue Li, Ling Xu, Jun Lei, Gan-Ji Zhong, Hua-Dong Huang, Zhong-Ming Li
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引用次数: 0
Abstract
High-performance dielectric capacitors are essential for advanced electronics and electrical power systems. Nonetheless, the enhanced discharged energy density (Ud) of polymer-based dielectric films is frequently accompanied by increased conduction and polarization losses as well as reduced charge–discharge efficiency (η). In this study, a scalable “melting extrusion–hot stretching–solid-state stretching” technique was proposed to fabricate high-performance polypropylene (PP)/poly(ethylene terephthalate) (PET) all-organic dielectric films. During hot stretching, PET microdroplets deformed into microfibrils in situ, establishing massive parallel interfaces. The subsequent solid-state stretching induced a mesophase-to-α-crystal transition, forming a mother–daughter crystalline structure. The synergistic effect of well-aligned microfibrillar interfaces and the dense mother–daughter crystalline structure could significantly enhance the breakdown strength and capacitive storage capability by suppressing carrier transport. As a result, the as-prepared PP/PET dielectric films demonstrated an exceptional breakdown strength of 672.2 MV m–1 and a maximum Ud of 4.11 J cm–3 with an η of as high as 92.8%. The proposed technique is demonstrated to be highly effective for structuring in situ well-aligned microfibrils and mother–daughter crystalline structures, thus promoting the development of next-generation, high-performance PP-based film capacitors.
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.