Article
Materials Science, Multidisciplinary
Wenxiang Zhang, Zhongquan Peng, Xi Zhang, Qiwei Pan, Shumei Liu, Bo Cao, Jianqing Zhao
Summary: In this study, high-performance liquid crystalline poly(ester imide)s (LCPEIs) were successfully synthesized with tunable solubility, thermal stability, mechanical properties, and dielectric properties through copolymerization of an imide dicarboxylic acid (IA) with other monomers. The LCPEI with 10 mol% IA showed excellent combined properties and could be a promising candidate for flexible copper-clad laminate substrates.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Chunbiao Wang, Yu Feng, Changhai Zhang, Tiandong Zhang, Qingguo Chi, Qingguo Chen, Qingquan Lei
Summary: This study introduced cyanate ester (CE) and polyhedral oligomeric silsesquioxanes (POSS) into epoxy to improve the dielectric and thermal properties and successfully synthesized a new packaging material that can be used in high-temperature environments and has excellent dielectric properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Mohamed A. Ismail, G. M. Nasr
Summary: The effect of adding nanoparticulate (organo-modified montmorillonite-MMT) into polyamide 66 (PA66) on the glass transition temperature (T-g), storage modulus (G '), and electrical properties was investigated using differential scanning calorimetry (DSC), dynamical mechanical analysis (DMA), and dielectric relaxation spectroscopy (DRS). The incorporation of clay nanoparticles led to a decrease in the glass transition temperature. DMA was found to be a valuable and sensitive technique for measuring T-g. The storage modulus increased with filler content, but decreased with temperature. The dielectric constant and ac electrical conductivity increased with filler content and temperature.
Article
Materials Science, Multidisciplinary
Man Liu, Yiheng Song, Hongmei Qin, Ziwei Li, Yuheng Fu, Chuanxi Xiong, Feihua Liu
Summary: The PAI/PI alloy fabricated through blending strategy shows strong intermolecular forces, leading to improved breakdown strength and dielectric properties. This novel molecular engineering strategy is an effective way to fabricate high-performance dielectric polymers for film capacitor applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Ruixi Bai, Hao Shao, Haibo Chang, Hongxia Wang, Xiang Ding, Weihua Cao, Yuying Cao, Tong Lin
Summary: Electrospun polyamide-imide (PAI) nanofiber membranes exhibit excellent piezoelectric properties under both ambient temperature and high-temperature conditions.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Ruowen Tu, Bokai Zhang, Henry A. Sodano
Summary: A high-temperature piezoelectric energy harvesting material, PbTiO3/PAI nanocomposites, with excellent piezoelectric response has been developed. The dependence of temperature and filler concentration on piezoelectric properties, as well as the effect of NW alignment, have been fully characterized in this study.
Article
Materials Science, Composites
Shuaishuai Zhou, Tongle Xu, Fang Jiang, Na Song, Peng Ding
Summary: This study demonstrates a flexible PAI/f-BNNSs composite film with high in-plane thermal conductivity, superior electrical insulation, and improved mechanical properties through the design of functionalized BN nanosheets. Systematic research on the degree of functionalization, defect quantities of f-BNNSs, and composite film performance revealed the mechanism of thermal conductivity improvement in PAI/f-BNNSs composite films.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Haoji Lao, Nafeesa Mushtaq, Guofei Chen, Bingyang Wang, Yuxia Ba, Xingzhong Fang
Summary: Two new series of transparent polyamide-imides with high modulus and low coefficient of thermal expansion were synthesized by copolymerizing BPDA, TPC, and TFDB. The block copolymer PAI-3-B1 showed the best performance with high transparency, low CTE, and high tensile modulus.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Physics, Applied
Zhen Zhang, Shengwen Shu, Zhiguo Wang, Zhengqiu Xie, Huizhong Wang, Chunchun Li, Shanming Ke, Longlong Shu
Summary: In this study, the interplay of flexoelectricity and permittivity in CCTO ceramic was systematically studied. An abnormal flexoelectric transition was observed at 95℃. It was found that below this critical temperature, the barrier layer mechanism dominates the flexoelectricity in CCTO ceramic, while above this critical temperature, the flexoelectric response mainly originates from the contributions of semiconducting grains and insulating grain boundaries.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Polymer Science
Yingwei Zhang, Chunhua Wang, Yong Yi, Wenzhi Wang, Jun Yang
Summary: A new strategy of introducing an aromatic imide structure into the polyamide 6 (PA6) chain has been reported to adjust its properties and broaden its applications. The PAI salt was synthesized by reacting the diimide diacid monomer with 1,6-hexamethylene diamine, and PA6/PAI random copolymers were obtained by random copolymerization of ε-caprolactam and PAI salt. The introduction of aromatic imide into the PA6 chain greatly affects its properties, and the copolymer PA6/PAI-20 with 20 wt% PAI content exhibits the best comprehensive performance with high thermal stabilities, excellent mechanical properties, and dielectric properties superior to PA6.
Article
Polymer Science
Dallas Kesler, Bhanuka P. Ariyawansa, Hemali Rathnayake
Summary: Metal oxide nanoparticle-reinforced polymers have attracted attention for their superior mechanical properties. This study investigated the effect of nanoscale reinforcements on polymer composites and found that a composite with 5 wt% ZnO nanorods exhibited improved elastic modulus, stiffness, and hardness. The viscoelastic response of the composite also showed enhanced performance to high impacts. However, the composites were still vulnerable to hypervelocity impact, although those reinforced with ZnO nanorods exhibited a cellular-like matrix with shock-induced voids.
Article
Engineering, Electrical & Electronic
Wenyi Yang, D. D. L. Chung
Summary: This study examines the effect of temperature on the conduction and dielectric behavior of solder, with findings showing that electrical resistivity increases linearly with temperature while relative permittivity remains constant. The increase in thermal vibration amplitude affects the conduction behavior more than the dielectric behavior, making solder an attractive option as electrical conductors in electronics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
O. I. Sallam, M. M. Atta, E. O. Taha, A. M. Elbasiony, A. M. A. Henaish, R. M. Ahmed
Summary: Novel fluorophosphate glass systems were fabricated via conventional melting with the composition of 20NaF-60P2O5-20Na2O doped with 3 wt % transition metals (CuO, CoO, Fe2O3 , and NiO). The effects of transition metal doping on the photoluminescence (PL) and dielectric properties of the base systems were investigated. The sample doped with Fe2O3 showed the lowest PL intensity, while CuO displayed the highest PL intensity. Adding CuO and Fe2O3 enhanced the dielectric parameters slightly. The base composite doped with CuO and Fe2O3 exhibited the highest energy density values, while NiO and CoO-doped systems had the lowest energy density values. The ac conductivity of the base system was improved by CuO and Fe2O3 doping, while CoO and NiO hindered the charge carriers' motion and decreased conductivity. Non-Debye-type relaxation processes were dominant in all the investigated systems.
Article
Engineering, Electrical & Electronic
Gengguang Luo, Dongyang Zhuang, Kaihua Yang, Li Ma, Zhiyi Che, Chao Y. Xu, Zhenyong Cen, Xiyong Chen, Qin N. Feng, Nengneng Luo
Summary: The appropriate addition of MnO2 as a sintering aid in 0.84NaNbO(3)-0.16CaTiO(3) ceramic capacitors has been found to stabilize the antiferroelectric phase, optimize the microstructure, and increase the breakdown electric field. The sample doped with 1.5 mol% MnO2 exhibits excellent energy storage performance with an ultrahigh recoverable energy storage density of 5.8 J/cm(3), efficiency of 81%, splendid frequency and temperature stabilities, and outstanding charge-discharge properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Applied
Jierui Zhou, Michael Sotzing, Zongze Li, Chao Wu, Peinan Zhou, Yifei Wang, Yang Cao
Summary: This study experimentally investigates the electrical conduction of polyethylene terephthalate (PET) films at ultrahigh fields up to breakdown. The research reveals that the breakdown strength of PET remains stable within the temperature range of 25 degrees C to 100 degrees C, while the charge-to-breakdown increases dramatically over the same temperature range. Furthermore, a turning point is observed around the glass transition temperature (T-g) of PET for the onset field of the nonlinear conduction. The Arrhenius analysis shows different activation energies above and below T-g, indicating an increased temperature-dependence of conduction above T-g.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Guillaume Belijar, Sombel Diaham, Zarel Valdez-Nava, Thierry Lebey
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2016)
Article
Physics, Applied
G. Belijar, Z. Valdez-Nava, S. Diaham, L. Laudebat, T. B. Jones, T. Lebey
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2017)
Article
Engineering, Electrical & Electronic
M. -L. Locatelli, C. D. Pham, S. Diaham, L. Berquez, D. Marty-Dessus, G. Teyssedre
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2017)
Article
Engineering, Electrical & Electronic
Mohammed Houssat, Nadine Lahoud Dignat, Jean-Pascal Cambronne, Sombel Diaham
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2018)
Article
Materials Science, Multidisciplinary
M. Moudoud, A. Hedir, O. Lamrous, S. Diaham, T. Touam
MATERIALS RESEARCH EXPRESS
(2019)
Review
Polymer Science
Alejandro Can-Ortiz, Lionel Laudebat, Zarel Valdez-Nava, Sombel Diaham
Summary: This paper provides a comprehensive review of field-grading materials in electrical engineering applications, discussing the use of polymer composites functionalized with conductive or semiconductive particles to reduce electric field and grade it within the system. Recent developments and applications in high-performance high-voltage engineering are also highlighted.
Article
Polymer Science
Imadeddine Benfridja, Sombel Diaham, Fathima Laffir, Grace Brennan, Ning Liu, Tadhg Kennedy
Summary: This paper presents the most comprehensive study to date on the effect of cure temperature on the physico-chemical, mechanical, thermal and electrical properties of polyimide. The study accurately investigates the role of imidization and charge-transfer complex formation on these properties. The results demonstrate the importance of finding the right balance between DOI and PI chain packing for optimal performance.
Article
Physics, Applied
Jiawei Zhang, Li Wang, Junhui Chen, Matsumoto Takao, Sombel Diaham, Chen Song
Summary: In this study, a fiber-optic Fabry-Perot (F-P) sensor based PD detection system was designed and compared with the ultrahigh-frequency (UHF) antenna. The results showed that the average sensitivity of PD signals detected by the F-P sensor increased by 17.2%, which is of great significance for online monitoring of the insulation performance of power equipment and has wide application potential.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Sombel Diaham, Paul Lambkin, Baoxing Chen
Summary: This study investigates the nonlinear dielectric properties of polyimide films under high-intensity AC electric fields. It is found that nonlinear DC conduction is a component of the AC conductivity and dielectric loss response when the field strength exceeds a certain threshold. The high-intensity, high-frequency fields induce additional Poole-Frenkel polarization, contributing to the nonlinearity. The study introduces a novel expression in the Cole-Cole format to capture the large signal behavior of the complex permittivity. Experimental results demonstrate that the dielectric properties and power dissipation density in polyimide films remain linear and frequency-independent below a threshold field. Therefore, polyimide-based insulated electronic devices designed to operate below this threshold field will not be affected by frequency-dependent electrical aging.
JOURNAL OF APPLIED PHYSICS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Mohammed Houssat, Nadine Lahoud Dignat, Jean-Pascal Cambronne, Sombel Diaham
2017 IEEE 12TH NANOTECHNOLOGY MATERIALS AND DEVICES CONFERENCE (NMDC)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Sombel Diaham, Francois Saysouk, Marie-Laure Locatelli
2017 IEEE 12TH NANOTECHNOLOGY MATERIALS AND DEVICES CONFERENCE (NMDC)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
F. Carrasco, A. Velazquez-Salazar, L. Berquez, S. Diaham, V. Griseri, T. Lebey, M. L. Locatelli, D. Marty-Dessus, H. Muto, K. Tajiri, T. Tsurimoto, G. Teyssedre
2017 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS (ISEIM), VOLS 1 & 2
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Guillaume Belijar, Zarel Valdez-Nava, Sombel Diaham, Lionel Laudebat, Thierry Lebey
2017 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS (ISEIM), VOLS 1 & 2
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Guillaume Belijar, Elena Samartean, Zarel Valdez-Nava, Sombel Diaham, Thierry Lebey
2017 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENON (CEIDP)
(2017)
Article
Physics, Applied
S. Diaham, G. Belijar, M. -L. Locatelli, T. Lebey
APPLIED PHYSICS LETTERS
(2017)