静电纺P(VDF-TrFE)纳米纤维在柔性压电传感与能量收集领域的研究进展

压电聚合物聚偏氟乙烯-三氟乙烯(P(VDF-TrFE))作为聚偏氟乙烯(PVDF)典型的共聚物,具有优异的压电性能、机械性能及生物相容性。因此基于P(VDF-TrFE)静电纺压电网膜的柔性压电传感器与能量收集器在可穿戴电子设备、智能纺织品及医疗健康系统等领域有着广阔的前景,能够将触觉/压力、应变、声波甚至生理微振动等信号转换为电学信号或低功率的电能。本文旨在深入分析P(VDF-TrFE)压电性能的机制,总结各种提升静电纺P(VDF-TrFE)纳米纤维压电性的策略,全面概述P(VDF-TrFE)基柔性压电传感与能量收集方面的应用,特别是在压力与触觉传感、声传感、生物组织传感、生理微振动传感及能量收集等领域的研究进展。阐述了静电纺压电聚合物纳米纤维的新兴应用场景,并讨论了该领域目前的挑战和未来前景。     

聚偏氟乙烯压电薄膜的实验研究

一、聚偏氟乙烯薄膜性能特点 聚偏氟乙烯(以下称为PVDF)薄膜为一种新型压电材料,在水声、超声、电声等领域中可与现有的PZT压电陶瓷取长补短,是压电材料领域新添的一员。 自从五十年代PZT压电陶瓷问世以来,三十多年中它始终在换能器材料中占主导地位,尽管PZT作为压电材料有着无可比拟的优点,但也存在着由陶瓷固有性能所带来的缺点和在换能器设计上的不便之处,如陶瓷的高密度和易碎性使大于10cm的水听器太厚、太重,而薄的器件     

聚偏氟乙烯声发射换能器及其应用简介

一、前言声发射是指在材料中由于能量快速释放而产生的瞬态弹性波。它既可用于研究各种现象如材料的破坏过程,又可用于检测材料中存在的各种缺陷。和 X 射线探伤、超声探伤一样是广为采用的无损检测技术。一般用压电换能器将声发射产生的应力波转变为低电平(十几微伏到数毫伏)高阻抗(数十到数百微微法)的电信号,然后经前置放大器放大、高通宽频滤波器滤波、最后经增益放大器放大。聚偏氟乙烯是最重要的压电聚合物,具有压电陶瓷(如锆酸钛酸铅 PZT)所不具备的许多特点,它的压电性能虽比不上压电陶瓷,但聚偏氟乙烯柔软,易于加工成形状复杂的制品;在较宽的频率范围(10kHz～5MHz)内有平坦的响应;它的内耗较高、密度较小,对试样的机械响应影响很小;它的声阻抗(材料的密度和声速之积)和玻璃纤维增强聚合物复合材料的声阻抗相近,因此,即使不用粘接剂,在界面上的能量反射很少,而 PZT 的阻抗比聚偏氟乙烯高一个数量级;最后聚偏氟乙烯成本较低。因此,在复合材料的声发射测试中,用聚偏氟乙烯代替 PZT 具有十分重要的意义。     

电致变色器件关键材料凝胶聚合物电解质研究进展

凝胶聚合物电解质是构成电致变色器件(ECD)的关键材料,其在器件中作为电极间的传导介质,为电致变色反应提供补偿离子。利用不同基体材料制备的凝胶聚合物电解质对提高电致变色器件性能具有重要影响。综述了聚环氧乙烷(PEO)、聚丙烯腈(PAN)、聚甲基丙烯酸甲酯(PMMA)、聚偏氟乙烯(PVDF)、聚偏氟乙烯-六氟丙烯(PVDF-HFP)、聚乙烯醇缩丁醛(PVB)及生物材料作为凝胶电解质聚合物基体的导电机理。阐述了它们作为电致变色器件电解质层对离子电导率、透光度、电致变色性能的影响。最后对凝胶聚合物电解质未来发展趋势进行了展望。     

纳米复合型固体聚合物电解质材料的研究进展

综述了纳米复合型聚合物电解质材料研究工作的基本情况。着重介绍了以聚氧化乙烯、聚偏氟乙烯、聚丙烯腈、聚氯乙烯和聚磷腈等为聚合物基体的纳米复合型固体聚合物电解质材料的研究进展,并对其研究前景做了展望。     

聚偏氟乙烯压电薄膜

宾沃尔特(Pennwalt)公司的 Kynar 压电聚偏氟乙烯薄膜可用作路面传感器以帮助管理交通信号。聚偏氟乙烯薄膜通常不产生压电现象,但伸展薄膜并使分子排列整齐,用金属覆层包覆和在强电场中处理薄膜(使聚偏氟乙烯薄膜中的氢和氟原子取向)后,会产生压电现象。当伸展和受压时,薄膜产生电流。用这种薄膜制成的交通传感装置能计算车辆数,称     

PVDF压电薄膜的结构、机理与应用

简要论述了聚偏二氟乙烯(PVDF)压电薄膜材料的结构与性质,介绍了薄膜压电性产生的机理及其制备方法,概述了PVDF压电材料的应用。     

PVDF／PAn纳米复合材料的制备及介电性能的研究

以N—N二甲基甲酰胺为溶剂、十二烷基苯磺酸钠为表面活性剂、过硫酸铵为氧化剂,利用聚偏氟乙烯（PVDF）中氟原子与苯胺分子中胺基氢原子之间的氢键作用,将苯胺小分子吸附于聚偏氟乙烯表面,然后经过乳液聚合反应,使聚苯胺（PAn）纳米颗粒均匀地包覆在聚偏氟乙烯表面,通过分子自组装过程制备出了具有核壳结构的聚苯胺包覆型PVDF／PAn纳米复合材料,用FT—IR、XRD、SEM、TH2818分析仪分析了材料的结构、形貌以及介电性能。     

聚偏氟乙烯-六氟丙烯基复合聚合物电解质的化学改性研究进展

主要介绍了近年国内外锂离子电池聚偏氟乙烯-六氟丙烯基复合聚合物电解质的化学改性研究进展。对组成聚偏氟乙烯-六氟丙烯基复合聚合物电解质的隔膜、增塑剂、锂盐的研究现状及机理做了总结,并展望了聚合物电解质的发展前景。     

混合稀释剂对热致相分离法制备聚偏氟乙烯微孔膜结构的影响

以邻苯二甲酸二甲酯(DMP)/邻笨二甲酸二辛酯(DOP)为混合稀释剂,采用热致相分离法(TIPS)制备聚偏氟乙烯(PVDF)微孔膜.研究了聚合物浓度、降温速率、混合稀释剂配比和凝固浴温度对聚偏氟乙烯微孔膜结构的影响.结果表明,随聚合物浓度的增加,膜断面由树枝状结构过渡为球粒状结构,最终转变为致密结构;随降温速率的增加,...     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.