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熔融态介电泳排列乙烯/钛酸钡热塑性复合材料：增强医疗应用的压敏智能传感器。

Molten-State Dielectrophoretic Alignment of EVA/BaTiO Thermoplastic Composites: Enhancement of Piezo-Smart Sensor for Medical Application.

机构信息

Laboratoire de Génie Electrique et Ferroélectricité, Campus Ladoua, Institut National des Sciences Appliquées, Université de Lyon, 69621 Villeurbanne, France.

Department Materials Engineering and Nanotechnology, Politecnico di Milano, Campus Leonardo, 20133 Milan, Italy.

出版信息

Int J Mol Sci. 2022 Dec 12;23(24):15745. doi: 10.3390/ijms232415745.

DOI:10.3390/ijms232415745
PMID:36555385
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9779483/
Abstract

Dielectrophoresis has recently been used for developing high performance elastomer-based structured piezoelectric composites. However, no study has yet focused on the development of aligned thermoplastic-based piezocomposites. In this work, highly anisotropic thermoplastic composites, with high piezoelectric sensitivity, are created. Molten-state dielectrophoresis is introduced as an effective manufacturing pathway for the obtaining of an aligned filler structure within a thermoplastic matrix. For this study, Poly(Ethylene-co Vinyl Acetate) (EVA), revealed as a biocompatible polymeric matrix, was combined with barium titanate (BaTiO) filler, well-known as a lead-free piezoelectric material. The phase inversion method was used to obtain an optimal dispersion of the BaTiO within the EVA thermoplastic matrix. The effect of the processing parameters, such as the poling electric field and the filler content, were analyzed via dielectric spectroscopy, piezoelectric characterization, and scanning electron microscopy (SEM). The thermal behavior of the matrix was investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry analysis (DSC). Thermoplastic-based structured composites have numerous appealing advantages, such as recyclability, enhanced piezoelectric activity, encapsulation properties, low manufacturing time, and being light weight, which make the developed composites of great novelty, paving the way for new applications in the medical field, such as integrated sensors adaptable to 3D printing technology.

摘要

近年来，介电泳已被用于开发高性能弹性体基结构压电复合材料。然而，目前还没有研究集中于开发各向异性热塑性基压电器件复合材料。在这项工作中，制备了具有高各向异性和高压电灵敏度的热塑性复合材料。引入熔融态介电泳作为一种有效的制造途径，以在热塑性基体中获得取向的填充结构。在这项研究中，聚（乙烯-共-醋酸乙烯酯）（EVA）被用作一种生物相容性聚合物基质，与钛酸钡（BaTiO）填充剂结合使用，BaTiO 是一种无铅压电材料。采用相反转法获得 EVA 热塑性基体中 BaTiO 的最佳分散。通过介电谱、压电特性和扫描电子显微镜（SEM）分析了加工参数（如极化电场和填充剂含量）的影响。通过热重分析（TGA）和差示扫描量热法分析（DSC）研究了基质的热行为。基于热塑性的结构复合材料具有许多吸引人的优点，如可回收性、增强的压电活性、封装性能、低制造时间和重量轻，这使得开发的复合材料具有创新性，为在医疗领域的新应用铺平了道路，例如适用于 3D 打印技术的集成传感器。

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