高β相含量BaTiO3/PVDF-TrFE复合材料的压电和介电响应

IF 4.7 2区 化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Andrea Otero, María Jesús Sayagués, Francisco Javier Romero, Francisco José Gotor and Rocío Moriche*, 
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引用次数: 0

摘要

寻找柔性压电材料来制造适应性强的传感器、电子设备和纳米发电机已经成为一个关键的兴趣领域。在压电聚合物中加入压电陶瓷颗粒,如共聚物聚偏氟乙烯-三氟乙烯(PVDF-TrFE),是用来增强压电响应的策略之一。本文研究了BaTiO3含量对聚合物基复合材料β相形成、结晶、压电和介电性能的影响。与使用有机溶剂相比,高能球磨是一种有效的、更环保的技术,可以获得分散良好的混合物。在分散过程中,发生了非晶化和晶域尺寸减小。经过压缩成型和后处理,结晶度恢复,并强烈依赖于填料含量。虽然β相分数没有显著差异,但高BaTiO3含量会引起构象缺陷。由于压缩成型后陶瓷颗粒的存在,层间距离变小,后处理后几乎保持不变。对于复合材料而言,与纯PVDF-TrFE相比,获得可测量的压电系数(d33)所需的最小电压显著降低,即使含量较低,这也是实际应用的关键。根据BaTiO3分数,发现了三种不同的压电行为。对于体积为40 %的复合材料,其中基体和填料都有助于整体压电响应,使用两步极化方法诱导了协同效应,d33增加了约180%。然而,24 h后陶瓷贡献的放松使d33的值返回到应用一步轮询策略获得的值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Piezoelectric and Dielectric Response of BaTiO3/PVDF-TrFE Composites with High β-Phase Content

The search for flexible piezoelectric materials to build adaptable sensors, electronics, and nanogenerators has become a key area of interest. The addition of piezoceramic particles to piezoelectric polymers, such as the copolymer poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE), is one of the strategies used to enhance the piezoelectric response. In this work, the effect of BaTiO3 content on the β-phase formation, crystallization, and piezoelectric and dielectric properties of the polymer-based composites is investigated. High-energy ball milling was used as an effective, greener technique to achieve well-dispersed mixtures compared to those obtained using organic solvents. During the dispersion process, amorphization and reduction of the crystalline domain size occur. After compression molding and postprocessing, the crystallinity was recovered and was strongly dependent on the filler content. Although significant differences in the β-phase fraction were not observed, conformational defects are induced with high BaTiO3 contents. The interlayer distances became smaller due to the presence of the ceramic particles after compression molding and remained almost unchanged after postprocessing. For the composites, the minimum voltage required to obtain a measurable piezoelectric coefficient (d33) was significantly reduced compared to neat PVDF-TrFE, even for low contents, which is key for real applications. Three different piezoelectric behaviors were found depending on the BaTiO3 fraction. For composites with 40 vol %, where both matrix and filler contribute to the overall piezoelectric response, the use of a two-step poling method induced a synergistic effect with an increase in d33 of ∼180%. However, the relaxation of the ceramic contribution after 24 h returns the value of d33 to that obtained by applying a one-step poling strategy.

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来源期刊
CiteScore
7.20
自引率
6.00%
发文量
810
期刊介绍: ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.
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