Binary blends of poly(lactic acid) and poly(methyl methacrylate) for high energy density and charge/discharge efficiency capacitors

IF 5.4 1区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
GIANT Pub Date : 2024-09-10 DOI:10.1016/j.giant.2024.100340
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引用次数: 0

Abstract

Polymer dielectrics are widely used in modern power electronics due to their high flexibility and high breakdown strength. However, the limited energy density of current polymer dielectrics limits their wider applications, and there is an urgent need to develop novel polymer dielectric materials. Poly(lactic acid) (PLA) is favored for biological applications due to its biocompatibility and biodegradability. In general, PLA has three optical isomers, namely poly(L-lactide) (PLLA), poly(D-lactide) (PDLA), and poly(DL-lactide) (PDLLA), but the investigation of their dielectric properties remains limited. In this study, a significant increase in energy storage density and charge/discharge efficiency in poly(methyl methacrylate) (PMMA) was achieved by incorporating isomers of PLA into PMMA. Experimental results indicate that the introduction of PLA creates a phase-separated structure within PMMA, and in particular, the introduction of the crystalline region significantly improved the breakdown strength (Eb). Finally, PLLA/PMMA 50/50 and PDLA/PMMA 50/50 exhibit the discharged energy densities of 8.55 J cm−3 and 8.18 J cm−3, respectively, with charge/discharge efficiencies of 89.6% and 90.9%. This work enables the achievement of all-organic dielectrics with high energy storage density and high efficiency through the construction of phase-separated structures and demonstrates the great potential of biodegradable polymers in electronic devices.

Abstract Image

用于高能量密度和充放电效率电容器的聚乳酸和聚甲基丙烯酸甲酯二元混合物
聚合物电介质具有高柔韧性和高击穿强度,因此被广泛应用于现代电力电子设备中。然而,目前聚合物电介质的能量密度有限,限制了其更广泛的应用,因此迫切需要开发新型聚合物电介质材料。聚乳酸(PLA)因其生物相容性和生物可降解性,在生物应用中备受青睐。一般来说,聚乳酸有三种光学异构体,即聚(L-乳酸)(PLLA)、聚(D-乳酸)(PDLA)和聚(DL-乳酸)(PDLLA),但对它们介电性能的研究仍然有限。在本研究中,通过在聚甲基丙烯酸甲酯(PMMA)中加入聚乳酸异构体,实现了聚甲基丙烯酸甲酯(PMMA)储能密度和充放电效率的显著提高。实验结果表明,聚乳酸的引入在 PMMA 中产生了相分离结构,尤其是晶体区的引入显著提高了击穿强度(Eb)。最后,PLLA/PMMA 50/50 和 PDLA/PMMA 50/50 的放电能量密度分别为 8.55 J cm-3 和 8.18 J cm-3,充放电效率分别为 89.6% 和 90.9%。这项工作通过构建相分离结构实现了高储能密度和高效率的全有机电介质,展示了生物可降解聚合物在电子器件中的巨大潜力。
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来源期刊
GIANT
GIANT Multiple-
CiteScore
8.50
自引率
8.60%
发文量
46
审稿时长
42 days
期刊介绍: Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.
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