压电陶瓷/聚合物基新型阻尼复合材料的研究进展

压电陶瓷/聚合物基复合材料兼具了聚合物和压电陶瓷两相的优点,是新型的智能阻尼材料.叙述了压电陶瓷/聚合物基复合材料的阻尼性能表征、阻尼原理以及影响阻尼性能的主要因素,并展望了研究前景.指出从压电阻尼材料的基础理论、制备工艺和性能表征、结构与性能关系上寻找突破,可以获得可控的高阻尼压电复合材料.     

O-3型压电陶瓷/聚合物复合材料的制备工艺新进展

0－3型压电陶瓷／聚合物复合材料具有单相压电陶瓷或聚合物所不具备的良好的综合性能,因此引起了人们广泛的兴趣和研究。本文综述了0－3型压电复合材料的制备工艺及相应复合材料的压电性能,重点介绍了水解－聚合法、凝聚－胶体法、溶液聚合法3种新型制备工艺,简要分析各种制备工艺的优缺点,为压电陶瓷／聚合物复合材料（甚至是纳米级压电复合材料）的进一步研究、开发和应用提供依据。     

聚偏氟乙烯及其共聚物基压电复合材料的研究进展

聚合物压电材料聚偏氟乙烯(PVDF)及其共聚物P(VDF-TrFE)、P(VDF-HFP)是一类典型的具有压电性的有机高分子材料,它们由于具有良好的力学性能、耐腐蚀性、生物相容性以及易于加工等特点而受到研究人员的广泛关注。但相对于传统无机类压电陶瓷材料来说,聚合物压电材料的压电常数仍相对较低,因此提升这类聚合物压电材料的压电性能已成为目前国内外的研究热点之一。本文对近年来国内外利用PVDF及其共聚物与不同功能材料进行复合来改善其压电性能的方法进行了概述,并对不同类型填料掺杂不同聚合物压电材料的利弊及发展趋势进行了展望。      

高性能压电材料制备技术及其应用

本项目在研究压电材料各向异性和微结构相图基础上,针对钙钛矿结构压电陶瓷和有机压电聚合物,采用独特工艺,制备了高性能低成本压电陶瓷,实现了新型陶瓷成分设计、微结构表征和性能优化;结合第一性原理密度泛函方法,建立了高性能有机压电聚合物的组织设计、结构调控、性     

0-3型陶瓷/聚合物压电复合材料的压电性能研究

采用溶液共混法和热压法分别制备了PZN-PZT/PI、PZN-PZT/PVDF 0-3型压电复合材料,所得材料具有较高的压电常数和良好的可柔性加工性能。并研究分析了无机压电陶瓷种类、含量,压电聚合物类型、制备工艺与极化参数对压电系数d₃₃的影响,在一定程度上提供了提高0-3型聚合物/陶瓷压电复合材料的压电性能的途径。      

PZT/聚合物压电复合材料的研究现状及其应用前景

近年来,PZT/聚合物压电复合材料以其特殊的应用性能和广阔的发展前景,在众多复合材料中脱颖而出,成为人们关注的焦点.概述了PZT/聚合物压电复合材料的种类、结构及应用,并阐述了现阶段研究的热门类型、性能和制备方法,展望了其未来的研究方向和发展前景.     

0-3型压电复合材料的压电性能研究

总结讨论了O-3型压电复合材料的一般特点，从理论与实验上研究分析了PZT含量、聚合物类型、陶瓷粉末与极化参数对压电系数^-d33的影响，在一定程度上提供了提高O-3型压电复合材料的压电性能的途径。     

含苯并噁唑半芳香聚酰胺的合成与表征

为了得到同时具有优良耐热性能和易加工性能的新型半芳香聚酰胺,以5-氨基-2-(对氨基苯)苯并噁唑(ABO)和己二酸基于Yamazaki磷酸化过程合成了聚己二酰对苯撑苯并噁唑二胺(BO6).研究了反应温度对聚合物分子量的影响,并通过FTIR、1H-NMR对其结构进行了表征;利用DSC、TG对其热性能进行了研究.结果表明:反应温度在90℃左右时高聚物获得了最高的粘数.该聚合物的耐热性较脂肪族聚酰胺有较大幅度的提高,同时该聚合物具有较好的耐溶剂性能.     

压电陶瓷/聚合物复合材料的制备工艺及其性能研究进展

本文首先介绍了压电材料的种类和基本性能,然后介绍了在不同的应用背景下压电陶瓷／聚合物复合材料的十种连通方式,综述了这类压电材料的制备工艺,较全面地总结了前人对这类压电材料的性能研究工作,展望了这类压电材料的应用前景和发展方向     

聚苯胺复合膜的制备及性质

用溶液共混法制备聚苯胺与聚酰胺的复合膜,并研究了复合膜的性能。将化学氧化法制备的本征态聚苯胺用樟脑磺酸(PANI—CSA)掺杂后,与基体聚合物聚酰胺-66,聚酰胺-1010或聚酰胺-11同时溶解在间甲酚溶剂中,干法浇膜,制得的复合膜的电导率处于10^-6S／m～10^2S／m范围,导电阈值2％。DSC法对复合膜热性能和结晶性能进行了研究。采用三种不同pH值的溶液对复合膜进行了处理,对其导电性能的变化进行了测试。     

Piezoelectric transformer structural modeling--a review

A review on piezoelectric transformer structural modeling is presented. The operating principle and the basic behavior of piezoelectric transformers as governed by the linear theory of piezoelectricity are shown by a simple, theoretical analysis on a Rosen transformer based on extensional modes of a nonhomogeneous ceramic rod. Various transformers are classified according to their structural shapes, operating modes, and voltage transforming capability. Theoretical and numerical modeling results from the theory of piezoelectricity are reviewed. More advances modeling on thermal and nonlinear effects also are discussed. The article contains 167 references.     

空间电荷聚合物驻极体材料的压电效应

自20世纪70年代空间电荷驻极体压电性概念被提出以来,开发新的聚合物压电材料一直是驻极体界研究的热点.这类材料的压电效应产生机制与传统的极性聚合物压电材料不同,是由于空间电荷在机械应力的作用下非对称性地向电极移动所致.本文从理论和实验两方面,对具有闭合型或开放型空洞结构和"软"、"硬"复合有机聚合物驻极体压电膜的研究现状进行了综述,并对进一步开展这类材料的研究提出了看法.     

Semi-quantitative mechanical characterisation of fibre composites in the sub-micron-range by SFM

The possibilities of using a Scanning Force Microscope (SFM) in tapping mode for a quantitative mechanical characterisation in the sub-micron-range are investigated. The test method and associated theory are presented and the technique is used to characterise glass fibre reinforced polyamide. Stiffness images are discussed with regard to the sample preparation method used and the mechanical properties of the interphase region between the fibres and the polyamide matrix.     

Biomolecular Piezoelectric Materials: From Amino Acids to Living Tissues

Biomolecular piezoelectric materials are considered a strong candidate material for biomedical applications due to their robust piezoelectricity, biocompatibility, and low dielectric property. The electric field has been found to affect tissue development and regeneration, and the piezoelectric properties of biological materials in the human body are known to provide electric fields by pressure. Therefore, great attention has been paid to the understanding of piezoelectricity in biological tissues and its building blocks. The aim herein is to describe the principle of piezoelectricity in biological materials from the very basic building blocks (i.e., amino acids, peptides, proteins, etc.) to highly organized tissues (i.e., bones, skin, etc.). Research progress on the piezoelectricity within various biological materials is summarized, including amino acids, peptides, proteins, and tissues. The mechanisms and origin of piezoelectricity within various biological materials are also covered.     

Nanoscale anti-plane cracking of materials with consideration of bulk and surface piezoelectricity effects

The influence of surface effect, including surface elasticity and surface piezoelectricity, on thefracture behavior of piezoelectricmaterials with an anti-plane crack is studied.Based on the coupled surface andinterface elasticity model, the solutions to the problem are obtained by applying the singular integral method. Bycomparing the solutions influenced by the surface piezoelectricity with those affected by the surface elasticity,it is found that the influence of the surface piezoelectricity on the crack opening displacement, the crackelectric potential jump across the crack center, the crack tip stress and electric displacement intensity factorscannot be ignored. Under various electrical boundary conditions, the influence of surface piezoelectricity onthe sliding displacement, crack tip stress and electric displacement intensity factors exhibits the same tendency.Besides, the influence of surface piezoelectricity on the electric displacement intensity factor is independentof the electrical boundary conditions, which is different from the results where only the surface elasticity isconsidered.     

Influence of the addition of thermoplastic preformed particles on the properties of an epoxy/anhydride network

An anhydride/epoxy system is modified by the introduction of thermoplastic microparticles (ORGASOL®). The influence of the presence of polyamide (PA) particles is evaluated on the reactivity of the epoxy/anhydride system below the melting temperature of the thermoplastic. Networks containing various amounts of polyamide are prepared using a cure schedule in order to keep the PA particles below their melting point. Both thermomechanical and mechanical behaviours (glass transition temperature, elastic, plastic and fracture properties) are studied and discussed as a function of the polyamide nature, the particle content and the adhesion between the particles and the matrix.     

Microstructure and mechanical properties of isotactic polypropylene (iPP)/polyamide 12 (PA12) blends

The microstructure and mechanical properties of polyamide 12/isotactic polypropylene blends with different compositions are studied. It is shown that the injection moulding technique used to process all samples results in a more or less pronounced orientation of macromolecular chains, which in its turn is responsible for a preferential orientation of polymer crystals. At a larger scale, the injection technique is also responsible for the deformation of polyamide domains into ellipsoides when polypropylene is dominant. In contrast, when polyamide is dominant, domains of both polymers are co-continuous in the materials. This feature is discussed on the basis of dynamic mechanical measurements.     

(Bi0.5Na0.5)TiO3系无铅压电陶瓷研究现状与展望

BNT陶瓷由于具有良好的压电性、高居里温度和烧结过程中无毒、易控制性等优点而倍受青睐.本文介绍了无铅压电陶瓷的研究概况、相变过程及其基本性质、制备工艺,根据已有的研究经验着重对BNT陶瓷掺杂改性进行了探讨,并展望了它的发展前景.     

基于压电效应的减振技术和阻尼材料

压电材料是一类重要的功能材料,具有将机械能和电能相互转化的压电效应,受到阻尼减振领域学者的广泛关注。概述了近年来利用压电效应控制结构振动和制备阻尼材料方面的研究成果。利用压电效应能够对结构振动进行有效的主动和主被动控制。与结构振动控制相比,利用压电效应制备阻尼材料还是一个年轻的领域。已有的研究表明,利用压电效应能够提高材料的阻尼性能。但仍有许多问题需要进一步研究,如界面相互作用对材料功能性质和力学性质的影响、提高压电材料产生的电能向热能转化的效率的方法、材料的阻尼性能与组成结构的关系等。     

A Three-Dimensional Asymptotic Theory of Laminated Piezoelectric Shells

An asymptotic theory of doubly curved laminated piezoelectric shells is developed on the basis of three-dimensional (3D) linear piezoelectricity. The twenty-two basic equations of 3D piezoelectricity are firstly reduced to eight differential equations in terms of eight primary variables of elastic and electric fields. By means of nondimensionalization, asymptotic expansion and successive integration, we can obtain recurrent sets of governing equations for various order problems. The two-dimensional equations in the classical laminated piezoelectric shell theory (CST) are derived as a first-order approximation to the 3D piezoelectricity. Higher-order corrections as well as the first-order solution can be determined by treating the CST equations at multiple levels in a systematic and consistent way. Several benchmark solutions for various piezoelectric laminates are given to demonstrate the performance of the theory.