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.

Preparation and Properties of Fluorine-Containing Colorless Polyimide Nanocomposite Films with Organo-Modified Montmorillonites for Potential Flexible Substrate

2008 ◽  
Vol 8 (4) ◽  
pp. 1700-1706 ◽  
Author(s):  
Jin-Ho Park ◽  
Jin-Hoe Kim ◽  
Jin-Woo Park ◽  
Jin-Hae Chang ◽  
Chang-Sik Ha
Keyword(s):  
Flexible Substrate ◽  
Thermomechanical Analysis ◽  
Amic Acid ◽  
Nanocomposite Films ◽  
Organic Modifiers ◽  
X Ray Diffraction ◽  
Modified Montmorillonite ◽  
Transmission Electron ◽  
Ft Ir ◽  
Polyimide Nanocomposite

We prepared transparent polyimide (PI) and organo-modified montmorillonite (OMMT) nanocomposite films from the solution of poly(amic acid) and various amounts (0.5–2 wt%) of OMMT in N,N-dimethylacetamide (DMAc). The Poly(amic acid) was prepared from the reaction of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2,2′-bis (trifluoromethyl)-4,4′-diamino phenyl (TFDB). Dodecylamine (C12-) and dodecyltriphenylphosphonium chloride (C12PPh-Cl–) were used as organic modifiers in OMMT. The PI/OMMT nanocomposite films were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), UV-Vis transmission spectra, thermomechanical analysis (TMA), and rheometric dynamic analysis (RDA). As the OMMT contents is increased, PI/OMMT nanocomposites generally show better properties compared to pristine PI films, although the transparency of the PI/OMMT nanocomposite films is sacrificed slightly. However, it is concluded that these nanocomposite films are good candidates for potential flexible substrates.

scholarly journals Thermal imidization of polyamic acid–fullerene composites: 'in situ' X-ray diffraction study

2007 ◽  
Vol 14 (3) ◽  
pp. 199-213
Author(s):  
M. E. Cagiao ◽  
A. O. Pozdnyakov ◽  
M. Krumova ◽  
V. V. Kudryavtsev ◽  
F. J. Baltá Calleja
Keyword(s):  
Diffraction Study ◽  
X Ray Diffraction ◽  
Polyamic Acid ◽  
X Ray ◽  
Thermal Imidization

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>

PHOTOREACTIVE THIN FILMS OF AZOBENZENE-DERIVATIZED POLY(AMIC ACID) AND POLY(IMIDE) LANGMUIR–BLODGETT–KUHN MULTILAYER ASSEMBLIES

2002 ◽  
Vol 11 (04) ◽  
pp. 367-389 ◽  
Author(s):  
YUN ZONG ◽  
ULRIKE HEES ◽  
WOLFGANG KNOLL ◽  
JÜRGEN RÜHE
Keyword(s):  
Amic Acid ◽  
Langmuir Trough ◽  
Solid Supports ◽  
X Ray ◽  
Langmuir Blodgett ◽  
Air Interface ◽  
Thermal Imidization ◽  
Monomolecular Layers ◽  
Multilayer Assemblies ◽  
Poly Imide

Various poly(amic acid)s with azobenzene-chromophore sidegroups have been synthesized and structurally and functionally characterized. Their amphiphilic properties allowed us to prepare stable monomolecular layers at the water/air interface of a Langmuir trough, and to transfer these highly organized monolayers to solid supports via the Langmuir–Blodgett–Kuhn deposition protocol. The resulting multilayer assemblies were investigated by surface plasmon- and waveguide-optical techniques, by X-ray reflectometry, and by UV-vis and IR spectroscopies. Thermal imidization of the assemblies resulted in functional poly(imide) multilayers that still could undergo photoisomerization reactions in their azobenzene sidegroups. The kinetic parameters of this trans-cis and cis-trans isomerization, respectively, as well as, the resulting control of the alignment of a liquid crystal in contact to these "command layers" were evaluated.

Preparation and characterization of a copper@polyimide core–shell structure via an in situ induction/imidization route

2016 ◽  
Vol 29 (5) ◽  
pp. 569-574
Author(s):  
Haoran Zhou ◽  
Dexin Wang ◽  
Chunyan Qu ◽  
Changwei Liu ◽  
Shanshan Mao
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Amic Acid ◽  
Core Shell ◽  
Oxidation Reactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Pure Cu

Based on the combination of an in situ induction and imidization method for improving the interface bonding of an inorganic material and a polymer, copper@polyimide (Cu@PI) core–shell composite particles have been successfully prepared from poly(amic acid) ammonium salts (PAAS) and a Cu complex via a simple solvothermal process. The structures and the morphologies of the samples were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy (TEM), respectively. It was found that PAAS formed PI via a thermal imidization and subsequently precipitated in the solvent. Through crystallization induction, it then successfully coated on the surface of the formed Cu particles. Based on thermo gravimetric analyses curves and due to no Cu oxidation reactions taking place in the core coated with high-temperature-resistant PI, the weight increase was determined to be 106.4%, instead of up to 124.0% in samples consisting of pure Cu.

Synthesis and Characterization of New Polyimide/Organoclay Nanocomposites Derived From 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride and 1,2-Bis(4-Aminophenoxy)Ethane

2013 ◽  
Vol 32 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Akram Feyzi ◽  
Khalil Faghihi ◽  
Abdol Ali Zolanvari
Keyword(s):  
Clay Content ◽  
Nanocomposite Films ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Biphenyltetracarboxylic Dianhydride ◽  
Ft Ir Spectroscopy

AbstractA series of nanocomposites consist of organic polyimide and organo-modified clay content varying from 0 to 10 mass%, were successfully prepared by in situ polymerization. Polyimide used as a matrix of nanocomposite was prepared through the reaction of 1,2-bis(4-aminophenoxy)ethane (BAE) and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) 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).

scholarly journals Synthesis of New Metallized Polyimide Films with High Optical and Physical Performances

2016 ◽  
Vol 6 (1) ◽  
pp. 57 ◽  
Author(s):  
Saule Kudaikulova ◽  
Galina Boiko ◽  
Bulat Zhubanov ◽  
Oleg Prikhodko ◽  
Vanda Yu. Voytekunas ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Elevated Temperatures ◽  
Amic Acid ◽  
Surface Resistivity ◽  
Visible Range ◽  
X Ray Diffraction ◽  
Polyimide Films ◽  
X Ray ◽  
Physical Performances

Electroconductive and reflective metallized polyimide films have been prepared by heterogeneous chemical modification of polyimide surface. By carrying out the chemical reactions in situ in the modified layers of polyimide surface, a metal phase strongly impregnated into the polyimide surface is obtained. The steps of chemical modification have been studied on the model compound – poly(amic acid) on the basis of isophthaloylchloride and methylenedianthranilic acid which forms insoluble sodium or potassium poly(amicacid) salts (polyamate). Metallization of Kapton HN &amp; JP (from DuPont) and Upilex S (from Ube) films<br />has been carried out and the films have been characterized by X-ray diffraction (XRD), X-ray fine diffraction (XRFD), measurements of reflectivity in the visible range and surface resistivity at elevated temperatures. It is shown that reflectivity coefficients of silvered films are 90-92% and surface resistivity is about 0.5 Ω/sq.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Sign in / Sign up

Export Citation Format

Share Document