Fangzhou Li, Linping Wang, Liang Gao, Da Zu, Dongyang Zhang, Tianhua Xu, Qiuyue Hu, Ren Zhu, Yunya Liu, Ben-Lin Hu
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引用次数: 0
摘要
高介电常数弹性体在可穿戴电子设备中有着广泛的应用,它可以通过弛豫铁电聚合物的弹性化来实现。然而,软长链的引入及其在强电场下的高迁移率会导致高介电损耗。鉴于弛张铁电聚合物的模量相对较低,可以通过引入短链交联剂来实现弹性化。本研究采用分子工程设计,利用刚性短链交联剂与弛豫铁电聚合物产生交联,从而获得了具有高介电常数和低介电损耗特点的本征弹性体。获得的本征铁电弹性体具有高介电常数(1 kHz 和 25 °C 时为 35)和低介电损耗(0.09)。此外,这种弹性体即使在高达 80% 的应变下也能表现出稳定的铁电响应和弛豫特性。这项研究为降低高介电常数本征弹性体的介电损耗提供了一种简单而有效的方法,从而拓展了其在可穿戴电子产品中的应用领域。
Reducing Dielectric Loss of High-Dielectric-Constant Elastomer via Rigid Short-Chain Crosslinking
High-dielectric-constant elastomers have broad applications in wearable electronics, which can be achieved by the elastification of relaxor ferroelectric polymers. However, the introduction of soft long chains, with their high mobility under strong electric fields, leads to high dielectric loss. Given the relatively low modulus of relaxor ferroelectric polymers, elastification can be realized by introducing short-chain crosslinkers. In this work, a molecular engineering design is employed, utilizing a rigid short-chain crosslinker to create crosslinks with relaxor ferroelectric polymer, resulting in intrinsic elastomers characterized by a high dielectric constant but low dielectric loss. The obtained intrinsic ferroelectric elastomer possesses a high dielectric constant (35 at 1 kHz and 25 °C) and a low dielectric loss (0.09). Furthermore, this elastomer exhibits stable ferroelectric response and relaxor characteristics even under strains up to 80%. The study supplies a simple but effective method to reduce the dielectric loss of high-dielectric-constant intrinsic elastomers, thereby expanding their application fields in wearable electronics.
期刊介绍:
Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.