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首页> 外文学位 >Dielectric and Electromechanical Properties of Polyurethane and Polydimethylsiloxane Blends and their Nanocomposites.
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Dielectric and Electromechanical Properties of Polyurethane and Polydimethylsiloxane Blends and their Nanocomposites.

机译：聚氨酯和聚二甲基硅氧烷共混物及其纳米复合材料的介电和机电性能。

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摘要

Conventional means of converting electrical energy to mechanical work are generally considered too noisy and bulky for many contemporary technologies such as microrobotic, microfluidic, and haptic devices. Dielectric electroactive polymers (D-EAPs) constitude a growing class of electroactive polymers (EAP) that are capable of producing mechanica work induced by an applied electric field. D-EAPs are considered remarkably efficient and well suited for a wide range of applications, including ocean-wave energy harvesters and prosthetic devices. However, the real-world application of D-EAPs is very limited due to a number of factors, one of which is the difficulty of producing high actuation strains at acceptably low electric fields.;D-EAPs are elastomeric polymers and produce large strain response induced by external electric field. The electromechanical properties of D-EAPs depend on the dielectric properties and mechanical properties of the D-EAP. In terms of dielectric behavior, these actuators require a high dielectric constant, low dielectric loss, and high dielectric strength to produce an improved actuation response. In addition to their dielectric properties, the mechanical properties of D-EAPs, such as elastic moduli and hysteresis, are also of importance. Therefore, material properties are a key feature of D-EAP technology.;DE actuator materials reported in the literature cover many types of elastomers and their composites formed with dielectric fillers. Along with polymeric matrix materials, various ceramic, metal, and organic fillers have been employed in enhancing dielectric behavior of DEs.;This work describes an effort to characterize elastomer blends and composites of different matrix and dielectric polymer fillers according to their dielectric, mechanical, and electromechanical responses. This dissertation focuses on the development and characterization of polymer-polymer blends and composites from a high-k polyurethane (PU) and polydimethylsiloxane (PDMS) elastomers. Two different routes were followed with respect to elastomer processing: The first is a simple solution blending of the two types of elastomers, and the second is based on preparation of composites from PU nanofiber webs and PDMS elastomer. Both the blends and the nanofiber web composites showed improved dielectric and actuation characteristics.
机译：对于许多现代技术，例如微机器人，微流体和触觉设备，通常认为将电能转换为机械功的常规方法过于嘈杂和笨重。介电电活性聚合物（D-EAP）构成了一类不断增长的电活性聚合物（EAP），它们能够产生由外加电场引起的机械功。 D-EAP被认为非常有效，非常适合包括海浪能量收集器和修复设备在内的广泛应用。然而，由于多种因素，D-EAP在现实世界中的应用受到很大限制，其中之一是在可接受的低电场下难以产生高驱动应变的困难。; D-EAP是弹性体聚合物，会产生较大的应变响应由外部电场感应。 D-EAP的机电性能取决于D-EAP的介电性能和机械性能。就介电性能而言，这些致动器需要较高的介电常数，较低的介电损耗和较高的介电强度才能产生改善的致动响应。除了其介电性能外，D-EAP的机械性能（例如弹性模量和滞后性）也很重要。因此，材料性能是D-EAP技术的关键特征。文献中报道的DE执行器材料涵盖了许多类型的弹性体及其与介电填料形成的复合材料。连同聚合物基体材料一起，各种陶瓷，金属和有机填料已被用于增强DE的介电性能。这项工作描述了根据其介电，机械性能，不同基体和介电聚合物填料的弹性体共混物和复合材料进行表征的工作和机电响应。本文主要研究和开发由高k聚氨酯（PU）和聚二甲基硅氧烷（PDMS）弹性体组成的聚合物-聚合物共混物和复合材料。在弹性体加工方面，遵循两种不同的途径：第一种是两种弹性体的简单溶液共混，第二种是基于由PU纳米纤维网和PDMS弹性体制备复合材料的方法。共混物和纳米纤维网复合材料均显示出改善的介电和致动特性。

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  • 作者

    Cakmak, Enes.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Textile research.;Nanotechnology.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 280 p.
  • 总页数 280
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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