Optimized designed polymer based sandwich structured nanocomposite films for ultrahigh breakdown strength

2020 ◽  
Author(s):  
Zakim Hussain ◽  
Allah Ditta ◽  
Xu Ye ◽  
Khalid Mehmood ◽  
Muhammad Yousaf ◽  
...  
Keyword(s):  
Breakdown Strength ◽  
Nanocomposite Films

Preparation and Dielectric Property of Al2O3 Surface Coating Modified BaTiO3/Polyimide Composite Film

2014 ◽  
Vol 908 ◽  
pp. 63-66
Author(s):  
Ya Jun Wang ◽  
Xiao Juan Wu ◽  
Chang Gen Feng
Keyword(s):  
Dielectric Constant ◽  
Barium Titanate ◽  
Composite Film ◽  
Breakdown Strength ◽  
In Situ Polymerization ◽  
Chemical Properties ◽  
Dielectric Strength ◽  
Xrd Analysis ◽  
Nanocomposite Films ◽  
The Matrix

Polyimide (PI) was chosen as the matrix of the composite, barium titanate/polyimide (BT/PI) nanocomposite films were prepared by in situ polymerization. In order to improve the dispersion and the physical-chemical properties of BT surface, barium titanate was modified by Al2O3coating and modified BT/PI nanocomposite films were prepared. The prepared modified BT was characterized by X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM), and the dielectric properties of the composites were characterized in detail. It was shown that surface modification with Al2O3is the chemical process and there were new substances forming. When BT was modified by 10 wt% Al2O3, the dielectric constant of the composite film was 18.96 (103Hz), the loss tangent 0.005, breakdown strength 70 MV·m-1, energy storage density 0.41 J·cm-3. The dielectric constant of BT modified by Al2O3is decreased while the dielectric strength of the modified BT/PI composite film is increased.

scholarly journals Thickness Dependency in Dielectric Breakdown Strength of Biaxially Oriented Polypropylene-Silica Nanocomposite Films

2018 ◽  
Author(s):  
Hannes Ranta ◽  
Ilkka Rytöluoto ◽  
Kari Lahti
Keyword(s):  
Power Law ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Nanocomposite Films ◽  
New Materials ◽  
Dielectric Breakdown Strength ◽  
Varying Thickness ◽  
Biaxially Oriented Polypropylene ◽  
Oriented Polypropylene ◽  
Different Thickness

<p>The power law relationship has been used to some extent in order to compare dielectric breakdown strength results between materials of varying thickness. However, especially in case of relatively new materials such as nanocomposites, it can be questioned whether the measured results actually behave accordingly to the power law and to what extent – most importantly, can the power law be used to predict properties of thinner films than those actually measured. This paper addresses the problem in case of biaxially oriented PPsilica nanocomposite films of different thickness, the breakdown results of which are compared and fitted to the power law relationship.</p>

Fabrication, Morphology and Properties of Polyimide/Al2O3 Nanocomposite Films via Surface Modification and Ion-Exchange Technique

2018 ◽  
Vol 921 ◽  
pp. 91-98
Author(s):  
Ming Yu Zhang ◽  
Li Zhu Liu ◽  
K.S. Hui
Keyword(s):  
Ion Exchange ◽  
Composite Film ◽  
Original Film ◽  
Treatment Time ◽  
Breakdown Strength ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Corona Resistance

Polyimide films with Al2O3composite layers were prepared by KOH solution surface hydrolysis, ion exchange and heat treatment. Scanning electron microscope (SEM), atomic force microscopy (AFM), X-ray diffractometry (XRD), thermo gravimetric analyzer (TGA), breakdown voltage tester, high frequency pulse voltage machine were performed to characterize the micromorphology, thermal stability, mechanical properties, electric breakdown strength, and corona resistance time of composite films. Results indicated that the thermal properties of the composite film are better than the original film. The corona resistance time of the composite film was longer than that of the pristine film. The composite film had the longest corona resistance time and reached 101.2min while the KOH treatment time was 90min.

Effect of imidization process on the performance of PI/nano-Al2O3 three layer composite film

2017 ◽  
Vol 46 (4) ◽  
pp. 327-331 ◽  
Author(s):  
Lizhu Liu ◽  
Hongju He ◽  
Ling Weng ◽  
Xiaorui Zhang
Keyword(s):  
Composite Film ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Composite Films ◽  
Inorganic Materials ◽  
Raw Material ◽  
Nanocomposite Films ◽  
Breakdown Field ◽  
Content Type ◽  
The Impact

Purpose The purpose of this paper was to comprehensively understand the effects of imidization process on the structure and properties of polyimide (PI) films through the preparation and characterization of a variety of PI/aluminium oxide (Al2O3) nanocomposite films by using several imidization-based strategies. Design/methodology/approach Poly(amic acid) (PAA) containing different amounts of inorganic materials (namely, 0 Wt.%, 4 Wt.%, 8 Wt.%, 12 Wt.% and 16 Wt.%) was synthesized by using pyromellitic dianhydride and 4,4-diaminodiphenyl ether as raw material and N,N-dimethylacetamide as solvent. Subsequently, the solution obtained was casted on a glass substrate and dried by the means of various curing processes. The micro-structure, Fourier transform–infrared spectral features, breakdown field strength, dielectric properties and the corona-resistant time parameters of films were achieved. Findings The imidization process influences substantially the properties of composite films. Therefore, as the imidization rate is increased, the corona-resistant time and the electrical breakdown strength of composite films are also improved, while the dielectric constant faces a+ decreasing. Research limitations/implications In this paper, the impact of imidization process on the performance of PI/nano-Al2O3 three-layered composite film is reported. However, there are multiple factors governing these systems (such as, interlayer thickness ratio and humidity), which are not discussed herein. Originality/value The current study expounds the relationship between imidization ratios as well as the effect of imidization ratio on the performance of the film.

Structured Polyethylene Nanocomposites: Effects of Crystal Orientation and Nanofiller Alignment on High Field Dielectric Properties

MRS Advances ◽  
2016 ◽  
Vol 2 (6) ◽  
pp. 363-368 ◽  
Author(s):  
Bo Li ◽  
C. I. Camilli ◽  
P. I. Xidas ◽  
K. S. Triantafyllidis ◽  
E. Manias
Keyword(s):  
Crystal Orientation ◽  
High Field ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Film Surface ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Polyethylene Matrix ◽  
X Ray ◽  
Orientation Order

ABSTRACTIn previous work we have shown that aligned high aspect-ratio (pseudo-2D) nanofillers can yield large dielectric breakdown strength (EBD) improvements for a nanocomposite with a low-crystallinity polyethylene matrix. Here, we report a systematic study which delineates the contributions of the aligned inorganic fillers and of the aligned polymer crystallites in the overall EBD improvement achieved in the nanocomposites. Specifically, extrusion blown-molded polyethylene/montmorillonite nanocomposite films were cold-stretched to various strains, to further align the nanoparticles parallel to the film surface; this filler alignment is accompanied by a commensurate alignment of the polymer crystallites, especially those heterogeneously nucleated by the fillers. A systematic series of films are studied, with increased extent of alignment of the fillers and of the crystalline lamellae (quantified through Hermans orientation order parameters from 2D X-ray diffraction studies) and the aligned structure is correlated to the electric field breakdown strength (quantified through Weibull failure studies). It is shown that aligned pseudo-2D inorganic nanofillers provide additional strong improvements in EBD, improvements that are beyond, and added in excess of, any EBD increases due to polymer-crystal orientation.

scholarly journals Dielectric Property and Space Charge Behavior of Polyimide/Silicon Nitride Nanocomposite Films

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 322 ◽  
Author(s):  
Minghua Chen ◽  
Wenqi Zhou ◽  
Jiawei Zhang ◽  
Qingguo Chen
Keyword(s):  
Dielectric Constant ◽  
Silicon Nitride ◽  
Space Charge ◽  
Loss Tangent ◽  
Breakdown Strength ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Polymeric Materials ◽  
Nanocomposite Films ◽  
Transport Channel

Polymeric materials have many applications in multiple industries. In this paper, silicon nitride nanoparticles (Si3N4) were incorporated into a polyimide (PI) matrix to obtain composite films via the in situ polymerization method. The Si3N4 nanoparticles were consistently scattered in the composites, and the thickness of PI/Si3N4 films was around 50 µm. The effects of nanoparticle content on the dielectric constant, loss tangent and breakdown strength were simultaneously studied. A 3 wt.% doped PI/Si3N4 film revealled excellent dielectric properties, a dielectric constant (ε) of 3.62, a dielectric loss tangent (tanδ) of 0.038, and a breakdown strength of 237.42 MV/m. The addition of Si3N4 formed an interface layer inside PI, resulting in a large amount of space charge polarization in the electric field. The space charge of materials from the microscopic point of view was analyzed. The results show that there are trapenergy levels in the composites, which can be used as a composite carrier center and transport channel, effectively improving the performance of a small amount of nanoparticles film.

Preparation of Barium Titanate/Polyimide Composite Film and its Dielectric Properties

2013 ◽  
Vol 815 ◽  
pp. 93-98 ◽  
Author(s):  
Ya Jun Wang ◽  
Xiao Juan Wu
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Breakdown Strength ◽  
In Situ Polymerization ◽  
Nanocomposite Films ◽  
Energy Storage Density ◽  
Factors Affecting ◽  
Ultrasonic Time ◽  
The Matrix

Polyimide (PI) was chosen as the matrix of the composites, barium titanate/polyimide (BT/PI) nanocomposite films were prepared with in-situ polymerization. The morphology of the samples was obtained by SEM. The factors affecting the dielectric properties are discussed. When the mass fraction of BT is 70%, the dielectric constant will be 19.32, and loss 0.00254 (at 103 Hz). The optimal solvent content and ultrasonic time were 9.2 ml and 30 min respectively. TG analysis shows that the film is stable below 500°C. The AC breakdown strength were 42 MV·m-1 and 64 MV·m-1 for 70% BT/PI and 60% BT/PI respectively, and corresponding energy storage density were 0.17 J·cm-3 and 0.30 J·cm-3 respectively.

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