Polyimide for Electronic and Electrical Engineering Applications最新文献

Polyimide Used in Space Applications 用于空间应用的聚酰亚胺

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-09-09 DOI: 10.5772/intechopen.93254

V. Griseri

{"title":"Polyimide Used in Space Applications","authors":"V. Griseri","doi":"10.5772/intechopen.93254","DOIUrl":"https://doi.org/10.5772/intechopen.93254","url":null,"abstract":"Polyimide (PI) is an interesting material for space applications as it offers excellent thermal properties. However, due to its dielectric properties, charge storage and release can be at the origin of electrostatic discharges that are hazardous for the surrounding electrical equipment. Depending on the spacecraft orbit, it is necessary to study the impact of specific surrounding environment. In any cases, the effect of vacuum and temperature variations can be combined with electrons and protons’ irradiation, atomic oxygen erosion, and photons impact from UV exposure. On the market, there exist many types of PI, and since several years, composite are also developed. The main properties that are usually observed are the conductivity that is analyzed from surface potential decay, the photoemission and the ability to initiate and propagate surface flashover. Since several years, the space charge storage analysis by the pulse electro-acoustic method has been developed as an interesting complementary tool. It is important to remember that experimental characterization needs to be representative to the space environment especially because it has been observed that PI can recover its original properties in air in a couple of hours depending on the ageing degree.","PeriodicalId":131194,"journal":{"name":"Polyimide for Electronic and Electrical Engineering Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125479656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Synthesis Process Optimization of Polyimide Nanocomposite Multilayer Films, Their Dielectric Properties, and Modeling 聚酰亚胺纳米复合多层膜的合成工艺优化、介电性能及建模

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-08-20 DOI: 10.5772/intechopen.91206

S. Akram, J. Castellon, S. Agnel, J. Habas

{"title":"Synthesis Process Optimization of Polyimide Nanocomposite Multilayer Films, Their Dielectric Properties, and Modeling","authors":"S. Akram, J. Castellon, S. Agnel, J. Habas","doi":"10.5772/intechopen.91206","DOIUrl":"https://doi.org/10.5772/intechopen.91206","url":null,"abstract":"Polymer nanocomposite-based dielectric materials are playing a vital role in the area of electrical insulation research and developments. The nanoparticle dispersion and interface region are the crucial parts of these developments. This chapter begins with the description of physical properties and their derived nanoparticles of polyimide (PI) films. Then, the detailed synthesis process of PI/nanocomposite multilayer film and its optimization is discussed in this chapter. Several factors in the synthesis process, which can influence the quality of the film, are discussed. After synthesis, the dielectric properties such as space charge were measured, and the results are compared with single and multilayer PI/nanocomposite films. Simulations and modeling help to shed light on the experimental results and create an understanding of polymer nanocomposite properties. Therefore, the PI/nanocomposite multilayer 3D model based on boundary conditions obtained from SEM/TEM images of synthesized samples was also constructed and simulated in COMSOL multiphysics software. The nanoparticle agglomeration and the impact of nanoparticle dispersion on the electrical properties of the material are described in detail in this model. The results demonstrate that the nanoparticle dispersion is improved by using a thin layer of PI/nanocomposite on PI film. As a result, fewer space charges and low electric fields are observed in multilayer films.","PeriodicalId":131194,"journal":{"name":"Polyimide for Electronic and Electrical Engineering Applications","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114571123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

High-Temperature Polyimide Dielectric Materials for Energy Storage 用于储能的高温聚酰亚胺介电材料

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-05-26 DOI: 10.5772/intechopen.92260

J. Zha, Xue-Jie Liu, Yaya Tian, Z. Dang, George Chen

引用次数: 75

Polyimides as High Temperature Capacitor Dielectrics 聚酰亚胺作为高温电容器介质

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-05-25 DOI: 10.5772/intechopen.92643

J. Ho, M. Schroeder

{"title":"Polyimides as High Temperature Capacitor Dielectrics","authors":"J. Ho, M. Schroeder","doi":"10.5772/intechopen.92643","DOIUrl":"https://doi.org/10.5772/intechopen.92643","url":null,"abstract":"Nearly five decades of effort has focused on identifying and developing new polymer capacitor films for higher-than-ambient temperature applications, but simultaneous demands of processability, dielectric permittivity, thermal conductivity, dielectric breakdown strength, and self-clearing capability limit the number of available materials. Demands on these criteria are even more stringent in growing numbers of applications demanding high power performance. Aromatic polyimides, though not a panacea, are a class of heat-resistant polymers of great interest to researchers as capacitor dielectrics because of good thermal and mechanical stability. In this chapter, the key aspects and advantages of metallized polymer film capacitors are compared to analogous alternative technologies (polymer-film-metal-foil, ceramic, and electrolytic capacitors), followed by a comprehensive review of commercial resin development leading up to recent research on polyimides targeted for operating temperature above 150°C. Finally, this chapter provides a brief discussion on the recent effort on combining computation and synthesis to design polymers with desirable dielectric properties.","PeriodicalId":131194,"journal":{"name":"Polyimide for Electronic and Electrical Engineering Applications","volume":"483 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123060258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Lifetime of Polyimide under Repetitive Impulse Voltages 重复冲击电压作用下聚酰亚胺的寿命

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-05-02 DOI: 10.5772/intechopen.91973

Yan Yang, Guangning Wu

引用次数: 1

Charging and Discharging Mechanism of Polyimide under Electron Irradiation and High Voltage 聚酰亚胺在电子辐照和高压下的充放电机理

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-05-01 DOI: 10.5772/intechopen.92251

Xiaoping Wang, D. Min, Shengtao Li

{"title":"Charging and Discharging Mechanism of Polyimide under Electron Irradiation and High Voltage","authors":"Xiaoping Wang, D. Min, Shengtao Li","doi":"10.5772/intechopen.92251","DOIUrl":"https://doi.org/10.5772/intechopen.92251","url":null,"abstract":"Polyimide has been widely used as insulating and structural materials in spacecraft due to its excellent electrical, thermal and mechanical properties. However, its charging and discharging problem in harsh space environment has been a major limit to the development of high-voltage and high-power spacecraft. In this chapter, charging and discharging phenomena of dielectric materials under electron irradiation environment were presented. First, the electrical properties of polyimide consisting of dielectric properties, trap properties, conductivity and electrical breakdown properties were investigated, which have great influences on charging and discharging characteristics. Then, a surface charging model under relatively low-energy electron irradiation was proposed for polyimide, based on the synergistic effects of electron movement above surface and charge transport in surface layer. The DC surface flashover of polyimide under electron irradiation with different energies, fluxes and incident angles was investigated. Furthermore, a deep charging model under high-energy electron irradiation with the Fluence Model for Internal Charging (FLUMIC) spectrum was established. The effects of electron flux enhancement and operating voltage on charging characteristics were discussed in different grounding modes. It indicates that the processes of discharging under electron irradiation have a close link with the charge transport characteristics of polyimide.","PeriodicalId":131194,"journal":{"name":"Polyimide for Electronic and Electrical Engineering Applications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117353164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Synthesis and Properties of Fluorinated Polyimides from Rigid and Twisted Bis(Trifluoromethyl)Benzidine for Flexible Electronics 柔性电子用刚性和扭曲双(三氟甲基)联苯胺氟化聚酰亚胺的合成及其性能

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-04-20 DOI: 10.5772/intechopen.92010

S. Kim, T. Byun, J. Kim, I. Chung, S. Kim

{"title":"Synthesis and Properties of Fluorinated Polyimides from Rigid and Twisted Bis(Trifluoromethyl)Benzidine for Flexible Electronics","authors":"S. Kim, T. Byun, J. Kim, I. Chung, S. Kim","doi":"10.5772/intechopen.92010","DOIUrl":"https://doi.org/10.5772/intechopen.92010","url":null,"abstract":"Fluorinated polyimides were prepared from the twisted benzidine monomer containing two trifluoromethyl (CF3) groups on one aromatic ring. The diamine monomer having a rigid and nonplanar structure was polymerized with typical dianhydride monomers including BPDA, BTDA, ODPA, 6-FDA, and PMDA, to obtain the corresponding polyimides. Most polyimides are soluble in organic solvents due to their twisted chain structure and can be solution cast into flexible and tough films. These films have a UV-vis absorption cut-off wavelength at 354–398 nm and a light transparency of 34–90% at a wavelength of 550 nm. They also have tensile strengths of 92–145 MPa and coefficients of thermal expansion (CTE) of 6.8–63.1 ppm/°C. The polymers exhibited high thermal stability with 5% weight loss at temperatures ranging from 535 to 605°C in nitrogen and from 523 to 594°C in air, and high glass temperature (Tg) values in the range of 345–366°C. Interestingly, some of the soluble polyimides showed thermo-responsive behaviors in organic solvents presumably due to the multiple hydrogen bondings with unsymmetrically positioned two CF3 groups along the polymer chains.","PeriodicalId":131194,"journal":{"name":"Polyimide for Electronic and Electrical Engineering Applications","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121130823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Molecular Structure Modification and Nano-Doping on Charge Transportation of Polyimide Films for Winding Insulation 分子结构修饰和纳米掺杂对绕线绝缘聚酰亚胺薄膜电荷输运的影响

Polyimide for Electronic and Electrical Engineering Applications Pub Date : 2020-04-11 DOI: 10.5772/intechopen.92024

B. Du, R. Xu, J. Xing, Li Jin

引用次数: 0