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.

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.

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.

Silver-Polyimide Nanocomposite Films Yielding Highly Reflective Surfaces

2001 ◽  
Vol 707 ◽  
Author(s):  
Robin E. Southward ◽  
C. J. Dean ◽  
J. L. Scott ◽  
S. T. Broadwater ◽  
D. W. Thompson
Keyword(s):  
Composite Films ◽  
Weight Percent ◽  
Amic Acid ◽  
Nanocomposite Films ◽  
Polyimide Films ◽  
Electrically Conductive ◽  
Reflective Surface ◽  
Solution Cast ◽  
Surface Metal ◽  
Polyimide Nanocomposite

ABSTRACTHighly reflective surface-metallized flexible polyimide films have been prepared by the incorporation of the soluble silver ion complex (1,1,1-trifluoroacetylacetonato)silver(I) into dimethylacetamide solutions of the poly(amic acid) prepared from 2,2-bis(3,4-dicarboxyphenyl)-hexafluoropropane dianhydride (6FDA) and 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoro-propane (4-BDAF). Thermal curing of solution cast silver(I)-poly(amic acid) films leads to cycloimidization of the amic acid with concommitant silver(I) reduction and formation of a reflective surface-silvered film at 8 and 13 weight percent silver. The metallized films are thermally stable and flexible with mechanical properties similar to those of the parent polyimide. TEM reveals that the bulk (interior) of the polyimide composite films have 5-20 nanometer-sized silver particles with a surface layer of silver metal ca. 80 nm thick. Neither the bulk nor the surface of the films is electrically conductive. Adhesion of the surface metal to polyimide is excellent.

scholarly journals Fabricating high thermal conductivity rGO/polyimide nanocomposite films via a freeze-drying approach

RSC Advances ◽  
2018 ◽  
Vol 8 (39) ◽  
pp. 22169-22176 ◽  
Author(s):  
Shiyang Wei ◽  
Qiaoxi Yu ◽  
Zhenguo Fan ◽  
Siwei Liu ◽  
Zhenguo Chi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Freeze Drying ◽  
Composite Films ◽  
High Thermal Conductivity ◽  
Nanocomposite Films ◽  
Polyimide Nanocomposite

PI composite films with excellent thermal conductivity (as high as 2.78 W m−1 K−1) have been fabricated by a freeze drying approach.

Synthesis and properties of new clay-reinforced aromatic polyimide/nanocomposite-based 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 1,3-bis(4-aminophenoxy)propane

2014 ◽  
Vol 21 (2) ◽  
pp. 151-157
Author(s):  
Khalil Faghihi ◽  
Amir Rahimi ◽  
Akram Feyzi
Keyword(s):  
Amic Acid ◽  
Nanocomposite Materials ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Aromatic Polyimide ◽  
X Ray ◽  
Thermal Imidization ◽  
Polyimide Nanocomposite ◽  
Poly Imide

AbstractA series of poly(imide-ether)-clay nanocomposite materials-based 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 1,3-bis(4-aminophenoxy)propane and layered sodium montmorillonite (MMT/Na+) clay were successfully prepared by in situ reaction through thermal imidization up to 200°C. Poly(amic acid) (6) was prepared through the reaction of 1,3-bis(4-aminophenoxy)propane (4) and 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (5), and then a thermal plan of imidization was used for the synthesis of nanocomposite materials. The resulting nanocomposite films containing 0.5, 1, 3, and 5 wt.% of organoclay were characterized by Fourier transform infrared spectroscopy, wide-angle powder X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis, respectively. The introduction of organoclay in the polymer resulted in improved thermal stability.

Silver-Polyimide Nanocomposite Films Yielding Highly Reflective Surfaces

2001 ◽  
Vol 703 ◽  
Author(s):  
Robin E. Southward ◽  
C. J. Dean ◽  
J. L. Scott ◽  
S. T. Broadwater ◽  
D. W. Thompson
Keyword(s):  
Composite Films ◽  
Weight Percent ◽  
Amic Acid ◽  
Nanocomposite Films ◽  
Polyimide Films ◽  
Electrically Conductive ◽  
Reflective Surface ◽  
Solution Cast ◽  
Surface Metal ◽  
Polyimide Nanocomposite

ABSTRACTHighly reflective surface-metallized flexible polyimide films have been prepared by the incorporation of the soluble silver ion complex (1,1,1-trifluoroacetylacetonato)silver(I) into dimethylacetamide solutions of the poly(amic acid) prepared from 2,2-bis(3,4-dicarboxyphenyl)-hexafluoropropane dianhydride (6FDA) and 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoro-propane (4-BDAF). Thermal curing of solution cast silver(I)-poly(amic acid) films leads to cycloimidization of the amic acid with concommitant silver(I) reduction and formation of a reflective surface-silvered film at 8 and 13 weight percent silver. The metallized films are thermally stable and flexible with mechanical properties similar to those of the parent polyimide. TEM reveals that the bulk (interior) of the polyimide composite films have 5-20 nanometer-sized silver particles with a surface layer of silver metal ca. 80 nm thick. Neither the bulk nor the surface of the films is electrically conductive. Adhesion of the surface metal to polyimide is excellent.

scholarly journals Mechanical, thermal, and dielectric properties of functionalized graphene oxide/polyimide nanocomposite films

2019 ◽  
Vol 9 ◽  
pp. 184798041882103 ◽  
Author(s):  
Srosh Fazil ◽  
Masroor Bangesh ◽  
Wajid Rehman ◽  
Khurram Liaqat ◽  
Shaukat Saeed ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Films ◽  
Fold Increase ◽  
High Thermal Stability ◽  
Dielectric Constants ◽  
Nanocomposite Films ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Percent Improvement ◽  
Polyimide Nanocomposite

Ethyltriethoxysilane-functionalized graphene oxide/polyimide composite films were synthesized. Eighty percent improvement in Young’s modulus, high thermal stability at 800°C, and 3.46-fold increase in dielectric constants compared to polyimide with a dielectric loss of only 0.035 were exhibited by these composite films.

scholarly journals Preparation and Characterization of Transparent Polyimide Nanocomposite Films with Potential Applications as Spacecraft Antenna Substrates with Low Dielectric Features and Good Sustainability in Atomic-Oxygen Environments

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1886
Author(s):  
Yan Zhang ◽  
Bo-han Wu ◽  
Han-li Wang ◽  
Hao Wu ◽  
Yuan-cheng An ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Composite Films ◽  
Dissipation Factor ◽  
Low Earth Orbit ◽  
Nanocomposite Films ◽  
Dielectric Parameters ◽  
Low Dielectric ◽  
Aerospace Applications ◽  
Optically Transparent ◽  
Order Of Magnitude

Optically transparent polyimide (PI) films with good dielectric properties and long-term sustainability in atomic-oxygen (AO) environments have been highly desired as antenna substrates in low earth orbit (LEO) aerospace applications. However, PI substrates with low dielectric constant (low-Dk), low dielectric dissipation factor (low-Df) and high AO resistance have rarely been reported due to the difficulties in achieving both high AO survivability and good dielectric parameters simultaneously. In the present work, an intrinsically low-Dk and low-Df optically transparent PI film matrix, poly[4,4′-(hexafluoroisopropylidene)diphthalic anhydride-co-2,2-bis(4-(4-aminophenoxy)phenyl)hexafluoropropane] (6FPI) was combined with a nanocage trisilanolphenyl polyhedral oligomeric silsesquioxane (TSP-POSS) additive in order to afford novel organic–inorganic nanocomposite films with enhanced AO-resistant properties and reduced dielectric parameters. The derived 6FPI/POSS films exhibited the Dk and Df values as low as 2.52 and 0.006 at the frequency of 1 MHz, respectively. Meanwhile, the composite films showed good AO resistance with the erosion yield as low as 4.0 × 10−25 cm3/atom at the exposure flux of 4.02 × 1020 atom/cm2, which decreased by nearly one order of magnitude compared with the value of 3.0 × 10−24 cm3/atom of the standard PI-ref Kapton® film.

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