Microstructure and electrical properties in three-component (Al2O3–TiO2)/polyimide nanocomposite films

2010 ◽  
Vol 25 (12) ◽  
pp. 2384-2391 ◽  
Author(s):  
Jun-Wei Zha ◽  
Ben-Hui Fan ◽  
Zhi-Min Dang ◽  
Sheng-Tao Li ◽  
George Chen
Keyword(s):  
Glass Transition ◽  
Loss Factor ◽  
Breakdown Strength ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Inorganic Nanoparticles ◽  
Nanocomposite Films ◽  
Proposed Model ◽  
Polyimide Nanocomposite

Polyimide (PI)-matrix composite films containing inorganic nanoparticles (nano-Al2O3 and nano-TiO2) have been fabricated. A proposed model is used to explain different structures of the (Al2O3–TiO2)/PI (ATP) films synthesized by employing in situ polymerization. Dependences of dielectric permittivities of the ATP films on frequency and temperature were studied. Results show the breakdown strength of the films decreases with prolonging the corona aging time. The incorporation of the nano-Al2O3 and nano-TiO2 particles significantly improves the corona resistance of the films. The corona aging also influences the infrared absorbance, the glass transition temperature (Tg), and loss factor (tanδ) of the ATP films.

Thermally stable polyimide nanocomposite films from electrospun BaTiO3 fibers for high-density energy storage capacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (56) ◽  
pp. 44749-44755 ◽  
Author(s):  
Yun-Hui Wu ◽  
Jun-Wei Zha ◽  
Zhi-Qiang Yao ◽  
Fang Sun ◽  
Robert K. Y. Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Dielectric Properties ◽  
Dispersion Polymerization ◽  
Composite Films ◽  
High Density ◽  
Nanocomposite Films ◽  
Thermally Stable ◽  
Polyimide Nanocomposite ◽  
Polymerization Method

PI composite films with electrospun BT fibers were fabricated using the in situ dispersion polymerization method. The microstructures, thermal and dielectric properties of the BT fibers and composite films were investigated.

Electrical properties of TiO2-filled polyimide nanocomposite films prepared via an in situ polymerization process

2010 ◽  
Vol 160 (23-24) ◽  
pp. 2670-2674 ◽  
Author(s):  
Jun-Wei Zha ◽  
Zhi-Min Dang ◽  
Tao Zhou ◽  
Hong-Tao Song ◽  
George Chen
Keyword(s):  
Electrical Properties ◽  
In Situ Polymerization ◽  
Nanocomposite Films ◽  
Polymerization Process ◽  
Polyimide Nanocomposite

scholarly journals Thermal and electrical properties of polyimide/PANI nanofiber composites prepared via in situ polymerization

2018 ◽  
Vol 36 (2) ◽  
pp. 283-287
Author(s):  
Aseel A. Kareem
Keyword(s):  
In Situ Polymerization ◽  
Composite Films ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Nanofiber Composite ◽  
X Ray ◽  
Thermal And Electrical Properties ◽  
Ft Ir ◽  
Thermal Stability Of

Abstract Polyimide/polyaniline nanofiber composites were prepared by in situ polymerization with various weight percentages of polyaniline (PANI) nanofibers. X-ray diffraction (XRD) and Fourier transform infrared spectra (FT-IR), proved the successful preparation of PANI nanofiber composite films. In addition, thermal stability of PI/PANI nanofiber composites was superior relative to PI, having 10 % gravimetric loss in the range of 623 °C to 671 °C and glass transition temperature of 289 °C to 297 °C. Furthermore, the values of the loss tangent tanδ and AC conductivity σAC of the nanocomposite films were notably higher than those of pure polyimide. The addition of 5 wt.% to 15 wt.% PANI nanofiber filler enhanced the activation energy of PI composites from 0.37 eV to 0.34 eV.

Enhancement of thermal stability and energy storage capability of flexible Ag nanodot/polyimide nanocomposite films via in situ synthesis

2020 ◽  
Vol 8 (36) ◽  
pp. 12607-12614 ◽  
Author(s):  
Shuang Xing ◽  
Zhongbin Pan ◽  
Xiaofeng Wu ◽  
Hanxi Chen ◽  
Xujiao Lv ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Filler Content ◽  
Composite Films ◽  
In Situ Synthesis ◽  
Nanocomposite Films ◽  
Discharge Energy ◽  
Polyimide Nanocomposite ◽  
Discharge Energy Density

Composite films with an ultralow filler content of 0.1 vol% Ag-NDs exhibit an excellent high-temperature discharge energy density of 2.56 J cm−3, together with efficiency exceeding 80% at a temperature of 150 °C.

scholarly journals Photoluminescence, thermal and surface properties of triarylimidazole-containing polyimide nanocomposite films

RSC Advances ◽  
2021 ◽  
Vol 11 (57) ◽  
pp. 36066-36077
Author(s):  
Wu Bai ◽  
Yunhua Lu ◽  
Zhizhi Hu ◽  
Guoyong Xiao ◽  
Hongbin Zhao ◽  
...  
Keyword(s):  
Surface Properties ◽  
Composite Films ◽  
Inorganic Nanoparticles ◽  
Nanocomposite Films ◽  
Thermal Imidization ◽  
Polyimide Nanocomposite

Three series of triarylimidazole-containing polyimide nanocomposite films were prepared via thermal imidization. Due to the introduction of inorganic nanoparticles including SiO2, Al2O3 and Si3N4, the fluorescence intensities of these composite films were clearly increased.

Particle Size Effect on the Corona Resistant Properties of PI/TiO2 Composite Films

2014 ◽  
Vol 981 ◽  
pp. 914-917
Author(s):  
Guang You Li ◽  
Jing Hua Yin ◽  
Lei Yao ◽  
Xing Zhao
Keyword(s):  
Particle Size ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Particle Size Effect ◽  
Interface Layer ◽  
Nanocomposite Films ◽  
Particle Sizes ◽  
Small Particles ◽  
The Matrix

Polyimide-based (PI) nanocomposites possess excellent electrical and thermal performance, widely used in inverter motor. In the paper using different particle sizes made polyimide/titania (PI/TiO2) nanocomposite films in situ polymerization, including 20nm A series and 50nm B series. The results shows that A series have a larger specific surface, combination of the film and matrix is closer without affecting the imidization of PI, and there is a clear interface layer and the structure is more stable. According to the time of corona-resistant A Series films is significantly longer than B Series films, especially the A series films with 15% of which corona-resistant time is 15h, five times than the pure PI. By both SAXS and XRD particle size in the matrix can be calculated, proving small particles can be better combination of the matrix of PI, increasing the number of traps, more effectively cutting off charge corrosion and making corona resistance greater performance.

Preparation and Dielectric Properties of Polyimide Nanocomposite Films Based on Hollow Silica

2011 ◽  
Vol 217-218 ◽  
pp. 647-651
Author(s):  
Yu Li ◽  
Yi He Zhang ◽  
Bo Shen ◽  
Feng Zhu Lv
Keyword(s):  
Dielectric Constant ◽  
In Situ Polymerization ◽  
Tetraethyl Orthosilicate ◽  
Nanocomposite Films ◽  
Polystyrene Microspheres ◽  
Hollow Silica ◽  
Silica Source ◽  
Silica Concentration ◽  
Polyimide Nanocomposite

The hollow silica was fabricated by using monodispersed polystyrene microspheres as core template and tetraethyl orthosilicate as silica source, and polyimide nanocomposite films with different hollow silica concentration were successfully prepared via in situ polymerization. The hollow silica and nanocomposite films were characterized. The results indicated that the diameter of the hollow silica is around 30nm and the dielectric constant of the nanocomposite films enhance with the increase of the concentration of the hollow silica.

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.

Preparation of graphene sheets/polyimide nanocomposite films by in-situ polymerization

2012 ◽  
Author(s):  
Bo Shen ◽  
Yihe Zhang ◽  
Li Yu ◽  
Fengzhu Lv ◽  
Jiwu Shang
Keyword(s):  
In Situ Polymerization ◽  
Nanocomposite Films ◽  
Graphene Sheets ◽  
Polyimide Nanocomposite
Sign in / Sign up

Export Citation Format

Share Document