scholarly journals In Situ Polymerization of Chiral Poly(fluorene-alt-benzothiadiazole) Nanocomposites with Enhanced Chirality

2020 ◽  
Vol 10 (23) ◽  
pp. 8740
Author(s):  
Hongsub Jee ◽  
Hyeong-Sub Oh ◽  
Jaehyeong Lee
Keyword(s):  
Optical Activity ◽  
In Situ Polymerization ◽  
Nanocomposite Films ◽  
High Quality ◽  
Chiral Metamaterials ◽  
Visible Wavelengths ◽  
Chiral Polymer

Poly(fluorene-alt-benzothiadiazole) (PFBT) is a promising chiral polymer for use in metamaterials and other photonic applications, due to its large chiral optical activity at visible wavelengths. However, its usages are very limited, since it is not readily patternable into microstructures and challenging to apply to applications. In this paper, we demonstrate photo patterning of chiral PFBT/Achiral SU-8 photoresist to produce high quality structures while retaining the extraordinary chiral optical activity of our previously-reported PFBT/SU8 nanocomposite films. The ability to produce cleanly patterned microfeatures with high chirality may enable wider use of PFBT in chiral metamaterials and other photonic applications.

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.

scholarly journals Synthesis and Characterization of New Polyimide/Organoclay Nanocomposites Containing Benzophenone Moieties in the Main Chain

2017 ◽  
Vol 57 (2) ◽  
Author(s):  
Khalil Faghihi ◽  
Mostafa Ashouri ◽  
Akram Feyzi
Keyword(s):  
Main Chain ◽  
In Situ Polymerization ◽  
Clay Content ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

<p>A series of nanocomposites consist of organic polyimide and organo-modified clay content varying from 0 to 5 wt%, were successfully prepared by in situ polymerization. Polyimide used as a matrix of nanocomposite was prepared through the reaction of 1,4-bis [4-aminophenoxy] butane (APB) and 3،3΄،4،4΄-benzophenone tetra carboxylic dianhydride (BTDA) in N,N-dimethylacetamide (DMAc). The resulting nanocomposite films were characterized by FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA).</p>

The Electrochemical Properties of Nanocomposite Films Obtained by Chemical In Situ Polymerization of Aniline and Carbon Nanostructures

ChemPhysChem ◽  
2012 ◽  
Vol 14 (1) ◽  
pp. 116-124 ◽  
Author(s):  
Marta E. Plonska-Brzezinska ◽  
Joanna Breczko ◽  
Barbara Palys ◽  
Luis Echegoyen
Keyword(s):  
Electrochemical Properties ◽  
Carbon Nanostructures ◽  
In Situ Polymerization ◽  
Nanocomposite Films

Preparation of Low-K Fluorinated Polyimide/Phlogopite Nanocomposites

2008 ◽  
Vol 47-50 ◽  
pp. 987-990
Author(s):  
Yi He Zhang ◽  
Qing Song Su ◽  
Li Yu ◽  
Li Bing Liao ◽  
Hong Zheng ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Layered Silicate ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Polymerization Process ◽  
Ultrasonic Dispersion ◽  
Thermal Stabilities ◽  
Fluorinated Polyimide ◽  
Polyimide Matrix

Phlogopite with layered silicate structure had been firstly chemically modified via an in situ intercalation method, and phlogopite-polymer nanocomposite films were prepared from 2,2'-bis (3,4-dicarboxyphenyl) hexafluropropane dianhydride (6FDA) and oxydimethyl aniline (ODA) in N,N-dimethylacetamide as a solvent by using in-situ polymerization process combined with ultrasonic dispersion and multi-step curing. The structure of phlogopite minerals and its polymer nanocomposites were characterized by X-ray diffraction (XRD) and infrared spectra (FTIR) respectively. The experimental results indicated that the phlogopites with layered nanostructure had lost their ordered structure and had been exfoliated or intercalated. Thereafter, they were dispersed randomly in the polyimide matrix. The dependence of dielectric properties and thermal stabilities of the nanocomposite films on the phlogopite content and frequency were studied.

scholarly journals Preparation and Property of Bio-Polyimide/Halloysite Nanocomposite Based on 2,5-Furandicarboxylic Acid

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4057
Author(s):  
Yingxia Chen ◽  
Shuya Fan ◽  
Xibin Yi ◽  
Bing Li ◽  
Shiwei Chen ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Young’S Modulus ◽  
Water Resistance ◽  
Moisture Absorption ◽  
In Situ Polymerization ◽  
Young's Modulus ◽  
Polyimide Film ◽  
Nanocomposite Films ◽  
Furandicarboxylic Acid

Bio-based polyimide (PI)/halloysite nanotube (HNT) nanocomposites based on 2,5-furandicarboxylic acid were prepared by in situ polymerization. The pristine HNTs were modified by tetraethoxysilane (TEOS) and 4,4′-oxybisbenzenamine (ODA). The bio-based PI/HNT nanocomposite film exhibited lower moisture absorption than pure bio-based polyimide, showing that the water resistance of the bio-based polyimide film was improved. The thermal stability and glass transition temperature (Tg) of PI/HNTs nanocomposites were improved with the addition of modified HNTs. Both the tensile strength and Young’s modulus of bio-based PI/HNTs nanocomposite films were enhanced. A 37.7% increase in tensile strength and a 75.1% increase in Young’s modulus of bio-based PI/HNTs nanocomposite films, with 1 wt% of the modified HNTs, were achieved. The result confirmed that 2,5-furandicarboxylic acid could replace the oil-based material effectively, thus reducing pollution and protecting the environment. Finally, a preparation mechanism to prepare bio-based PI/HNTs nanocomposite is proposed.

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.

Dual Antioxidant Properties and Organic Radical Stabilization in Cellulose Nanocomposite Films Functionalized by In Situ Polymerization of Coniferyl Alcohol

2020 ◽  
Vol 21 (8) ◽  
pp. 3163-3175
Author(s):  
Elise Gerbin ◽  
Yves-Michel Frapart ◽  
Carlos Marcuello ◽  
Betty Cottyn ◽  
Laurence Foulon ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Antioxidant Properties ◽  
Coniferyl Alcohol ◽  
Nanocomposite Films ◽  
Organic Radical

scholarly journals Dielectric properties of synthesized ternary hybrid nanocomposite embedded in poly (vinyl alcohol) matrix films

2020 ◽  
pp. 096739112095140
Author(s):  
Abdulwahhab H Majeed ◽  
Emaad T Bakir Al-Tikrity ◽  
Dhia H Hussain
Keyword(s):  
Anthranilic Acid ◽  
In Situ Polymerization ◽  
Dielectric Material ◽  
Low Frequency ◽  
Hybrid Nanocomposites ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol ◽  
Reduced Graphene ◽  
Ft Ir

This research involves preparation and characterization of ternary hybrid nanocomposites; reduced graphene oxide rGO nanosheets, manganese dioxide MnO2 nanorods and poly (anthranilic acid) hollow sphere PANA (rGO-MnO2-PANA). The synthesis follows bi-step chemical reaction. Initially, rGO and MnO2 were prepared separately, then mixed together ultrasonically to form a binary hybrid of rGO-MnO2. Second step includes in situ polymerization of anthranilic acid monomer with the prepared rGO-MnO2. All the prepared compounds were characterized by different techniques: FT-IR, XRD, SEM, EDX and TEM. Incorporation of the ternary hybrid in different weight ratios with PVA afforded the required nanocomposites (rGO-MnO2-PANA/PVA) films. The electrical properties of the nanocomposite films were investigated at frequency of 10 kHz-2 MHz. It was found that, at low frequency, the dielectric (real) permittivity (ε’) and imaginary permittivity (ε”) approached to higher values in all cases, while these values decreased gradually with increasing frequency. It was also confirmed that the alternating current conductivity of the composites increased with increasing frequency. These findings underline the potential employing of rGO-MnO2-PANA/PVA composites as a flexible dielectric material for enhancing polymer electrical conductivity and in energy storage applications.

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.

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