Preparation and Characterization of High-k Copper-Phthalocyanine/Polyimide Composites with Outstanding Thermal Stability

2011 ◽  
Vol 217-218 ◽  
pp. 697-700 ◽  
Author(s):  
Ji Wu Shang ◽  
Yi He Zhang ◽  
Yu Li ◽  
Feng Zhu Lv
Keyword(s):  
Thermal Stability ◽  
Dielectric Properties ◽  
High Performance ◽  
Volume Fraction ◽  
Copper Phthalocyanine ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Polymerization Process ◽  
Materials Used ◽  
High Dielectric

Materials used for microelectronic devices need to have more multifunctional properties, such as excellent mechanical, thermal, and dielectric properties at the same time. In this paper, copper phthalocyanine/polyimide (CuPc/PI) composite films with high dielectric permittivity (k=9.9 with the volume fraction of CuPc is 28% at 100Hz) and high thermal stability are prepared by an in-situ polymerization process. The composite films show good dielectric properties and is almost independent of frequency in the measured frequency range up to 104 Hz. Notablely, The composites remain stable until the temperature reaches 500oC. In addition, the inclusion of CuPc slow down the composite degradation rate when the temperature is higher than 550oC. The resultant high performance of such polymer composites makes them attractive for technological applications in flexible high-k components.

Dielectric behavior of a flexible three-phase polyimide/BaTiO3/multi-walled carbon nanotube composite film

2016 ◽  
Vol 09 (01) ◽  
pp. 1650006 ◽  
Author(s):  
Junli Wang ◽  
Shengli Qi ◽  
Yiyi Sun ◽  
Guofeng Tian ◽  
Dezhen Wu
Keyword(s):  
Composite Film ◽  
Volume Fraction ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Dielectric Behavior ◽  
Low Dielectric ◽  
Three Phase ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
High Dielectric

A three-phase composite film was produced by inserting multi-walled carbon nanotubes (MWCNTs) and BaTiO3 nanoparticles into polyimide (PI). The combination of in-situ polymerization and water-based preparation involved in the experiment ensured fillers’ homogeneous dispersion in the matrix, which led to flexible shape of the composite films. The dielectric properties of composite films as a function of the frequency and the volume fraction of MWCNTs were studied. Such composite film displayed a high dielectric constant (314.07), low dielectric loss and excellent flexibility at 100[Formula: see text]Hz in the neighborhood of percolation threshold (9.02 vol%) owing to the special microcapacitor structure. The experimental results were highly consistent with the power law of percolation theory.

Enhancing dielectric and mechanical properties of poly(arylene ether nitrile) based composites by introducing low content “core-shell” like structured MXene&PDA@ BaTiO3

2021 ◽  
pp. 095400832110149
Author(s):  
Weixi Zhang ◽  
Yuan Kai ◽  
Jian Lin ◽  
Yumin Huang ◽  
Xiaobo Liu
Keyword(s):  
Dielectric Properties ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Composite Films ◽  
Dielectric Materials ◽  
Nanocomposite Films ◽  
Core Shell ◽  
Low Dielectric ◽  
The Fourier Transform ◽  
High Dielectric

Polyarylene ether nitrile (PEN) based composites combined MXene, Polydopamine (PDA) and barium titanate (BaTiO3, BT) with “core-shell”-like structure were developed successfully in this work, and then incorporating into the PEN matrix to form the PEN/MXene&PDA@BT nanocomposite films through the solution casting method. The novel MXene&PDA@BT nanoparticles were characterized by the Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Then the structure and properties of the obtained PEN/MXene&PDA@BT nanocomposites are studied in detail. The results show that the modification of PDA improved the dispersibility of MXene nanosheets and BT nanoparticles in the PEN matrix, resulting in the enhancement of mechanical and dielectric properties. The research results reveal that when the content of MXene&PDA@BT is 1%, the tensile strength and modulus reached 114.15 MPa and 3015.74 MPa, respectively. Most important, the PEN based nanocomposites exhibit the outstanding frequency in dependent dielectric properties, including high dielectric constant (5.08 at 1 kHz) and low dielectric loss (0.0178 at 1 kHz). These results indicate that the PEN/MXene&PDA@BT composite films are greatly significant for using as the constructing high performance dielectric materials.

DIELECTRIC PROPERTIES OF POLY (VINYLIDENE FLUORIDE)/BARIUM TITANATE NANOCOMPOSITES UNDER GAMMA IRRADIATION

2019 ◽  
Vol 184 (3-4) ◽  
pp. 342-346
Author(s):  
K Waree ◽  
K Pangza ◽  
N Jangsawang ◽  
P Thongbai ◽  
S Buranurak
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Gamma Irradiation ◽  
Nanocomposite Film ◽  
Gamma Ray ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Composite Films ◽  
Significant Difference ◽  
Accumulated Dose

Abstract The main focus of this study is to investigate the effect of gamma irradiation on the electrical properties of PVDF/BT nanocomposites. A 1.25 MeV gamma-ray was delivered to the composite films with different BaTiO3-volume fraction, ƒBT = 0–0.4, and with different absorbed doses ranged 50–2500 Gy. Dielectric properties of PVDF/BaTiO3 composites under frequencies ranged from 100 Hz to 10 MHz at room temperature were investigated using an impedance analyser. An increase of 28% in the dielectric constant and a decrease of 15% in the loss tangent were observed in the PVDF/BT 40 vol% nanocomposite film under the accumulated dose of 1500 Gy. Scanning electron microscopy provided no significant difference in microscopic structures between non-exposed and gamma-exposed materials. Fourier-transform infra-red spectroscopy provides gamma-induced transition of PVDF-crystalline forms as alpha-PVDF into beta-PVDF/gamma-PVDF which has been reported as one of the main factors affected the change of dielectric constant in polymers. UV–visible spectrophotometry has been observed gamma-induced red shift in the absorption edge of the PVDF/BT 40 vol% nanocomposite film from 400 nm to 420 nm under the accumulated dose of 1500 Gy. However, a blue shift is observed with increase the accumulated dose up to 2000 Gy.

Fabrication and Ultraviolet Characterization of Potassium Sodium Niobate/Polyimide Hybrid Films

2013 ◽  
Vol 395-396 ◽  
pp. 121-124
Author(s):  
Jia Qi Lin ◽  
Pan Pan Zhang ◽  
Wen Long Yang
Keyword(s):  
In Situ Polymerization ◽  
Composite Films ◽  
Polymerization Process ◽  
Sodium Niobate ◽  
Hybrid Films ◽  
Potassium Sodium Niobate ◽  
Potassium Sodium

A functional potassium sodium niobate/polyimide (KNN/PI) composite films were prepared in this paper. KNN fillers are well dispersed in the PI matrix without any accumulation through in situ polymerization process. The optical band baps of the hybrid films become smaller with the increase of KNN loading. The optical band baps of the films with 0-20 wt% KNN filler are estimated to be 2.61 eV, 2.57 eV, 2.52 eV, 4.29 eV, 2.35 eV respectively.

Preparation and properties of thermostable well-functionalized graphene oxide/polyimide composite films with high dielectric constant, low dielectric loss and high strength via in situ polymerization

2015 ◽  
Vol 3 (18) ◽  
pp. 10005-10012 ◽  
Author(s):  
Xinliang Fang ◽  
Xiaoyun Liu ◽  
Zhong-Kai Cui ◽  
Jun Qian ◽  
Jijia Pan ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Graphene Oxide ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Low Dielectric ◽  
High Dielectric

Thermostable well-functionalized graphene oxide/polyimide composites with high dielectric constant and low dielectric loss were obtained at a low percolation threshold.

Preparation, Morphology and Dielectric Properties of Polyamide-6/Poly(Vinylidene Fluoride) Blends

2012 ◽  
Vol 496 ◽  
pp. 263-267
Author(s):  
Rui Li ◽  
Jian Zhong Pei ◽  
Yan Wei Li ◽  
Xin Shi ◽  
Qun Le Du
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Flexible Electronics ◽  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Polyamide 6 ◽  
Dielectric Constants ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

A novel all-polymeric material with high dielectric constant (k) has been developed by blending poly (vinylidene fluoride) (PVDF) with polyamide-6 (PA6). The dependence of the dielectric properties on frequency and polymer volume fraction was investigated. When the volume fraction of PA6 is 20%, the dielectric property is better than others. The SEM investigations suggest that the enhanced dielectric behavior originates from significant interfacial interactions of polymer-polymer. The XRD demonstrate that the PA6 and PVDF affect the crystalline behavior of each component. Furthermore, the stable dielectric constants of the blends could be tuned by adjusting the content of the polymers. The created high-k all-polymeric blends represent a novel type of material that are simple technology and easy to process, and is of relatively high dielectric constant, applications as flexible electronics.

Preparation and Dielectric Property of Ag/PVDF Composite Film

2014 ◽  
Vol 989-994 ◽  
pp. 242-245 ◽  
Author(s):  
Ya Jun Wang ◽  
Jian Wen Zhai ◽  
Fang Fang Wang ◽  
Chang Gen Feng
Keyword(s):  
Dielectric Properties ◽  
Dielectric Property ◽  
Composite Film ◽  
Volume Fraction ◽  
Composite Films ◽  
Dielectric Constants ◽  
Pvdf Film ◽  
Conductive Particle ◽  
Sem Images ◽  
Nanosilver Particles

Conductive particle fillers could improve the dielectric properties of the polymer matrix. By solvent casting method, different volume fraction of nanosilver particles were added into the PVDF film to prepare Ag/PVDF composite film so as to increase the dielectric properties of the materials. SEM was used to analyze the microstructure of the films. SEM images show that nanoAg filler particles were uniformly distributed throughout the whole matrix of the composite films. Dielectric property tests show that with the increase of nanoAg content, the dielectric constants of the composites increase first and decrease later while the dielectric losses decrease first and increase later. In the case of the optimal 17vol% Ag content, the dielectric constant of the composite film is the highest (14.5 at 100 Hz) with lower dielectric loss, and the energy storage density is relatively high (0.340 J·cm−3).

scholarly journals In situ polymerization of polypyrrole on cotton fabrics as flexible electrothermal materials

2019 ◽  
Vol 14 ◽  
pp. 155892501982744 ◽  
Author(s):  
Juan Xie ◽  
Wei Pan ◽  
Zheng Guo ◽  
Shan Shan Jiao ◽  
Ling Ping Yang
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
In Situ Polymerization ◽  
Thermo Gravimetric Analysis ◽  
Cotton Fabrics ◽  
Morphological Properties ◽  
Polymerization Process ◽  
Maximum Temperature ◽  
Gravimetric Analysis

Polypyrrole/cotton composites have substantial application potential in flexible heating devices due to their flexibility, high conductivity, and thermal stability. In this context, a series of flexible polypyrrole/cotton fabrics were intrinsically prepared using in situ polymerization process with the different Py/FeCl3 concentration ratios. To investigate their structural and morphological properties, thermal stability, tensile strength, conductivity, and heat-generating property, the composite fabrics were subjected to Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, thermo-gravimetric analysis, mechanical properties, and resistivity measurements. The results showed that polypyrrole/cotton fabrics exhibited a low resistivity of 0.37 Ω cm. Temperature–time curve showed that temperature of the polypyrrole/cotton fabrics increased very quickly from room temperature to a steady-state maximum temperature of 168.3°C within 3 min at applied voltage of 5 V. Tensile strength of polypyrrole/cotton composites reached to 58 MPa, which far surpassed raw cotton fabrics. Therefore, polypyrrole/cotton fabrics have exhibited high electrical, thermal properties, and mechanical strength, which can be utilized as an ideal flexible heating element.

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