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A single organic composite material having high dielectric constant is difficult to meet the needs of the market. Nowadays, polymer matrix-based composites have become a promising option that researchers are focusing on. Al-doped zinc oxide (ZnO) and composites containing ZnO as reinforcement and poly(vinylidene fluoride) (PVDF) as matrix were prepared. The microstructure of composites was analysed...
Polymerized organic thin films were synthesized on a variety of substrates by Plasma Enhanced Chemical Vapor Deposition (PECVD) technique using isopropanol as precursor. Hydrogen peroxide, ammonium hydroxide, and iodine dissolved in isopropanol were used as precursor's dopants and chlorobenzene as copolymerization precursor. The structural, optical and electrical properties of the films were studied...
Modified isothermal discharge current method (MIDC) was introduced to investigate the trap level distribution in Kapton 100HN and 100CR (nanodielectrics) PI films before and after corona ageing. The physical and chemical changes were studied by AFM and FT-IR respectively. Experiments showed that the quantity of traps was increased evidently after corona ageing and lots of deeper traps were produced...
A needle-plane electrode system was used to study the characteristics of the silicone rubber under AC corona. Microstructure and chemical structure change analysis on the surface of silicone rubber after corona ageing was made by using SEM, AFM and FTIR. Infrared spectrum shows that corona would cause the rupture of fundamental chain and branched chain of material. Along with the increase of corona...
Polyimide nanofibers were obtained by electrospinning a solution of poly(amic acid)(PAA), a precursor of polyimide(PI) prepared in the laboratory, in dimethylacetamide(DMAc) at 14kV, followed by thermal imidization. Mechanical property of the resulting nanofiber non-woven membranes was investigated by tensile tests. Chemical structure and surface morphology of the non-woven mats were characterized...
In the present paper, a kind of polyimide/silica/alumina hybrid films based on 4,4'-oxydianiline (ODA) and pyromellitic dianhydride (PMDA) was prepared through sol-gel reaction by the hydrolysis and condensation of methyltriethoxysilane (MTEOS) and heteropropyl aluminum in the polyamic acid (PAA) solution of N, N-dimethylacetamide (DMAc). The chemical structure of the films, characterized by FT-IR,...
A new class of polyimide hybrid films with various amounts of alumina has been synthesized by the sol-gel reaction and characterized. The hybrid films were obtained by the hydrolysis and polycondensation of heteropropyl-alumina in polyamic acid (PAA) solution of N,N'-dimethylacetamide (DMAc), followed by heating to 350degC. The chemical structure, surface morphology of the composites films were characterized...
This paper describes the degradation of unfilled high temperature vulcanized silicone rubber (HTV-SR) resulting from corona discharges. In this study, corona stress was produced by a needle-plane electrode system, and the chemical and morphological structures at the surface layer of SR before and after corona discharge treatment were analyzed by using the techniques of scanning electron microscope...
Currently the use of outdoor polymeric insulator materials are increasing in electrical distribution and transmission lines. One of them that are very popular is epoxy resins insulation material. There are several advantages of epoxy resins materials such as they have lower density mass, better dielectric properties, and higher volume resistivity compared to porcelain and glasses. However, there are...
A new class of polyimide/silica-alumina (PI/SiO/sub 2/-Al/sub 2/O/sub 3/) composite film was prepared by synthesizing ceramic oligomers through sol-gel reaction using tetraethoxysilane (TEOS) and heteropropyl-aluminium (HPAl) as the inorganic precursors and incorporating them into polyamic acid (PAA) derived from pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA) in N,N-diethlacetanide (DMA/sub...
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