In Situ Well-Aligned Microfibrils and Mother–Daughter Crystals as Promising Blocks to Suppress Carrier Transport in Polypropylene Dielectric Films

IF 5.1 1区 化学 Q1 POLYMER SCIENCE
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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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.

Abstract Image

原位排列整齐的微纤维和母女晶体是抑制聚丙烯电介质薄膜中载流子传输的理想基块
高性能电介质电容器对于先进的电子和电力系统至关重要。然而,聚合物电介质薄膜放电能量密度(Ud)的提高往往伴随着传导和极化损耗的增加以及充放电效率(η)的降低。本研究提出了一种可扩展的 "熔融挤出-热拉伸-固态拉伸 "技术,用于制造高性能聚丙烯(PP)/聚对苯二甲酸乙二醇酯(PET)全有机电介质薄膜。在热拉伸过程中,聚对苯二甲酸乙二酯(PET)微液滴在原位变形为微纤维,建立了大量平行界面。随后的固态拉伸诱导了介相到α晶体的转变,形成了母女结晶结构。排列整齐的微纤维界面和致密的母子晶体结构产生的协同效应可通过抑制载流子传输,显著提高击穿强度和电容存储能力。因此,制备的 PP/PET 介电薄膜的击穿强度高达 672.2 MV m-1,最大 Ud 为 4.11 J cm-3,η 高达 92.8%。事实证明,所提出的技术能非常有效地在原位构建排列整齐的微纤维和母子结晶结构,从而促进下一代高性能聚丙烯薄膜电容器的开发。
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来源期刊
Macromolecules
Macromolecules 工程技术-高分子科学
CiteScore
9.30
自引率
16.40%
发文量
942
审稿时长
2 months
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.
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