Preparation and Damping property Study of Styrene-Acrylic IPN/Mt Nano-composite Material

2011 ◽  
Vol 284-286 ◽  
pp. 382-386 ◽  
Author(s):  
Bo Hu ◽  
Ze Peng Zhang ◽  
Xiao Ming Liu ◽  
Ji Chu Zhang
Keyword(s):  
Layer Structure ◽  
Polymer Network ◽  
Single Layer ◽  
Mechanical Analysis ◽  
Interpenetrating Polymer Network ◽  
Nano Composite ◽  
Damping Property ◽  
Transmission Electron ◽  
New Material ◽  
Acrylate Monomers

In the emulsion system, styrene, acrylate monomers and montmorillonite (Mt) were used to prepare interpenetrating polymer network/montmorillonite (IPN/Mt) nano-composite. X-ray diffraction (XRD), transmission electron microscopy (TEM) and dynamic mechanical analysis (DMA) were used to characterize the structure and damping property of the new material. Results of XRD and TEM showed that the layer structure of Mt was destroyed and Mt dispersed in the polymer matrix by single layer. The result of DMA indicated that the damping property of Styrene-Acrylic IPN/Mt was much better than that of Styrene-Acrylic IPN. Damping value of the Styrene-Acrylic IPN/Mt was well improved and the maximum of tanδ increased from 0.621 to 0.739, with a broad damping domain ranging from -41°C to 140+°C. All these findings indicated that styrene-acrylate IPN /Mt nano-composite of broad damping temperature range and high damping value was successfully prepared.

A cross-linkable hole transport material having improved mobility through a semi-interpenetrating polymer network approach for solution-processed green PHOLEDs

2018 ◽  
Vol 6 (29) ◽  
pp. 7750-7758 ◽  
Author(s):  
So-Ra Park ◽  
Ji-Ho Kang ◽  
Dong A Ahn ◽  
Min Chul Suh
Keyword(s):  
Spin Coating ◽  
Layer Structure ◽  
Polymer Network ◽  
Hole Transport ◽  
Interpenetrating Polymer Network ◽  
Network Approach ◽  
Solution Processed ◽  
Ink Jet Printing ◽  
Ink Jet ◽  
Jet Printing

A novel cross-linkable hole transport material (HTM) was used to form a robust layer structure upon continuous wet processes such as spin coating or ink-jet printing.

Effect of Cenosphere on the Performance of Polyurethane/Polystyrene Interpenetrating Polymer Network Green Composites

2017 ◽  
pp. 158-185
Author(s):  
Roopa S. ◽  
Siddaramaiah
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Thermogravimetric Analysis ◽  
Castor Oil ◽  
Polymer Network ◽  
Thermal Characteristics ◽  
Mechanical Analysis ◽  
Interpenetrating Polymer Network ◽  
Toluene Diisocyanate ◽  
Green Composites

The effect of cenosphere content on the performances of polyurethane/polystyrene (PU/PS, 90/10) interpenetrating polymer network (IPN) based green composites have been studied. The PU/PS IPNs have been prepared using castor oil, toluene diisocyanate and styrene. IPN/cenosphere composites have been prepared with different weight fractions viz., 0, 5, 10, 20 and 30 wt % of cenosphere. The prepared IPN composites have been characterized by physico – mechanical, chemical and thermal behavior. The tensile strength of unfilled IPN was 1.79 MPa and a significant improvement in tensile strength (34%) was noticed for 10% cenosphere loaded IPN composite. The swelling behavior of the composites has been studied in different organic solvents. Thermal characteristics of the composites have been measured using differential scanning calorimeter, thermogravimetric analysis and dynamic mechanical analysis (DMA). A slight improvement in thermal stability was noticed for filler loaded specimens. Morphological features of cryo-fractured IPN/cenosphere green composites have been analyzed using SEM.

Dielectric Elastomers for Direct Wind-to-Electricity Power Generation

2009 ◽  
Author(s):  
Paul Brochu ◽  
Wei Yuan ◽  
Han Zhang ◽  
Qibing Pei
Keyword(s):  
Mechanical Stability ◽  
Mechanical Energy ◽  
Polymer Network ◽  
Single Layer ◽  
Energy Conversion Efficiency ◽  
Operational Reliability ◽  
Dielectric Elastomer ◽  
Low Energy ◽  
Interpenetrating Polymer Network ◽  
Comparative Results

We present a universal dielectric elastomer energy generator that can be scaled to match the requirements of the energy source. The design couples mechanical energy directly into an out of plane deflection that deforms the film. Cycling the generator between high and low strain states while applying a bias electric field switches the device between high and low energy states; charge that is injected at low energy can then be extracted at a higher potential. We present an analysis of the energy generation capacity and mechanical stability of the device and demonstrate its scalability via a compact, low energy/low deflection device and a larger, higher energy device. We demonstrate the capability of generating approximately 40 mJ per cycle in a single layer device with an active elastomer volume of only 0.57 cm3 and a maximum observed energy conversion efficiency of over 55%. We use recently developed advances in dielectric elastomer technology including interpenetrating polymer network films and carbon nanotube electrodes to improve operational reliability and present comparative results that demonstrate an increase in lifetime by several orders of magnitude over prestrained VHB acrylic films with carbon grease electrodes.

New Packaging Substrate Technology,Ibss (Interpenetrating Polymer Network Build Up Structure System)

1996 ◽  
Vol 445 ◽  
Author(s):  
Motoo Asai
Keyword(s):  
Printed Circuit Board ◽  
Layer Structure ◽  
High Reliability ◽  
Low Cost ◽  
Polymer Network ◽  
High Heat ◽  
Temperature Cycling ◽  
Interpenetrating Polymer Network ◽  
Circuit Board ◽  
Structure System

AbstractWe have developed a new type of printed circuit board which is called “IBSS” (Interpenetrating polymer network Build up Structure System) for the purpose of meeting the demand of high density routing, high reliability and low cost substrates in IC packages. The new technology achieves 50μm line / 50μm space and 100μm diameter photo‐via hole. Full additive method is applied for patterning, and the build‐up method is used to form the multi‐layer structure. The newly developed photo‐imagable dielectric resin, “IPN”, which has a glass transition of 200'C, a copper peel strength of 1.5kg/cm, and withstands 1000 cycles of temperature cycling (TCB), is used for IBSS. IPN is composed of high heat resistant photo‐sensitive epoxy and supper engineering plastic. This IBSS technology is suitable for direct chip attachment. This paper presents the characteristics IBSS.

Preparation and Characterization of pH Sensitive Microgels with Semi-Interpenetrating Polymer Network Structure

2011 ◽  
Vol 332-334 ◽  
pp. 1836-1839 ◽  
Author(s):  
Chen Zhang ◽  
Xiao Yun Liu ◽  
Liu Sheng Zha
Keyword(s):  
Ph Value ◽  
Polymer Network ◽  
Uranyl Acetate ◽  
Interpenetrating Polymer Network ◽  
Transmission Electron ◽  
Fourier Transformation Infrared Spectroscopy ◽  
One Step ◽  
Linear Poly ◽  
Ph Range ◽  
Reaction Media

The microgels with semi-interpenetrating polymer network (semi-IPN) structure based on cross-linked poly(N-isopropylacrylamide) (PNIPAM) and linear poly(acrylic acid) (PAA) were fabricated by one-step precipitation polymerization technique. The chemical composition of the microgels was determined by Fourier transformation infrared spectroscopy and elemental analysis. It was found that the PAA content inside the microgels decreased as the pH value of reaction media increased. The semi-IPN structure of the microgels was confirmed by transmission electron microscopy using uranyl acetate staining method. The pH dependent hydrodynamic diameters obtained by dynamic light scattering revealed that these microgels can reversibly shrink and swell in the pH range from 4.0 to 6.0. The semi-IPN microgels synthesized at pH 3.0 could undergo about 120 times volume change in the pH range.

MOCVD Growth and Structure of PbTiO3 Thin Films

1993 ◽  
Vol 310 ◽  
Author(s):  
Y. Gao ◽  
G. Bai ◽  
K. L. Merkle ◽  
H. L. M. Chang ◽  
D. J. Lam
Keyword(s):  
Thin Films ◽  
Layer Structure ◽  
Single Layer ◽  
Bottom Layer ◽  
Epitaxial Films ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
Mocvd Growth ◽  
Transmission Electron ◽  
Oriented Layers

AbstractPbTiO3 thin films grown on (001)MgO and (110)MgO by MOCVD have been characterized by x-ray diffraction and transmission electron microscopy. The PbTiO3 films deposited on (001)MgO under the optimum conditions always show a bi-layer structure. The top layer of the films near the free surface is c-axis oriented with the orientation relationship (001)[100]PbTiO3∥(001)[100]MgO. The bottom layer of the films near the substrate is a-axis oriented with (100)[001]PbTiO3∥(001)[100]MgO. 90° domains were observed, but only in the caxis oriented layers. The thickness of the a-axis oriented layers near the substrate decreases with decreasing the cooling rate. PbTiO3 films deposited on (110) MgO, however, are single-layer, epitaxial films with (101)[001]PbTiO3∥(110)[001]MgO.

scholarly journals Сверхтермостойкие полимерные нанокомпозиты на основе гетероциклических сеток: структура и свойства

2019 ◽  
Vol 61 (8) ◽  
pp. 1542
Author(s):  
В.А. Берштейн ◽  
А.М. Файнлейб ◽  
П.Н. Якушев ◽  
Д.А. Кириленко ◽  
О.Г. Мельничук
Keyword(s):  
Glass Transition ◽  
Elastic Properties ◽  
Polymer Network ◽  
Thermal Relaxation ◽  
Mechanical Analysis ◽  
Dynamic Heterogeneity ◽  
X Ray ◽  
Transmission Electron ◽  
The Matrix ◽  
Heterocyclic Polymer

Nanocomposites based on heterocyclic polymer network, obtained from bisphthalonitrile and different (0.03-5.0 wt. %) contents of modified silicate montmorillonite (MMT) nanolayers, were studied. Their nanostructure, thermal, relaxation and elastic properties were characterized by transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDXS), dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). DMA and TGA measurements were performed in both air and nitrogen mediums at temperatures from 20° to 600–900°C. Depending on MMT content, different extents of its exfoliation in the matrix, from single nanolayers to thin and “thick” MMT stacks were observed in the nanocomposites. The pronounced effects of constraining dynamics by nanoparticles and dynamic heterogeneity in the glass transition are shown. The possibilities for total suppression of glass transition and invariable elastic properties of nanocomposites within the temperature range from 20° to 600°C were shown. The studied nanocomposites manifest unique (for polymers) thermal properties, with glass transition temperature up to 570°С and satisfactory thermal stability, with retaining the material integrity, up to ~500°C in air and to ~900°C in N2 medium.

scholarly journals Development and Characterization of Semi-IPN Silver Nanocomposite Hydrogels for Antibacterial Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
A. Chandra Babu ◽  
M. N. Prabhakar ◽  
A. Suresh Babu ◽  
B. Mallikarjuna ◽  
M. C. S. Subha ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Sem Images ◽  
Nanocomposite Hydrogels ◽  
Transmission Electron ◽  
Silver Nanocomposite ◽  
20 Nm

Sodium carboxymethyl cellulose/poly(acrylamide-co-2-acrylamido-2-methylpropane sulfonic acid) semi-interpenetrating polymer network (semi-IPN) hydrogels were prepared by using free radical polymerization technique. Silver nanoparticles were formed by reduction of silver nitrate in semi-IPN hydrogels with sodium borohydrate at room temperature. UV-visible spectroscopy, thermogravimetrical analysis, X-ray diffractometry, scanning electron microscopy, and transmission electron microscopy techniques were used to characterize the formation of silver nanoparticles in hydrogels. SEM images indicated clearly the formation of group of silver nanoparticles with size range of 10–20 nm. The sizes of silver nanoparticles were also supported by transmission electron microscopy results. The semi-IPN silver nanocomposite hydrogels reported here might be a potentially smart material in the range of applications of antibacterial activity.

Characterization of a monolayer graphitic structure

1994 ◽  
Vol 52 ◽  
pp. 760-761
Author(s):  
X. Lin ◽  
X. K. Wang ◽  
V. P. Dravid ◽  
J. B. Ketterson ◽  
R. P. H. Chang
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Synthesis Process ◽  
Graphitic Structure ◽  
Positive Gaussian Curvature ◽  
Graphitic Sheet ◽  
Structural And Electronic Properties ◽  
New Material ◽  
Hexagonal Network

For small curvatures of a graphitic sheet, carbon atoms can maintain their preferred sp2 bonding while allowing the sheet to have various three-dimensional geometries, which may have exotic structural and electronic properties. In addition the fivefold rings will lead to a positive Gaussian curvature in the hexagonal network, and the sevenfold rings cause a negative one. By combining these sevenfold and fivefold rings with sixfold rings, it is possible to construct complicated carbon sp2 networks. Because it is much easier to introduce pentagons and heptagons into the single-layer hexagonal network than into the multilayer network, the complicated morphologies would be more common in the single-layer graphite structures. In this contribution, we report the observation and characterization of a new material of monolayer graphitic structure by electron diffraction, HREM, EELS.The synthesis process used in this study is reported early. We utilized a composite anode of graphite and copper for arc evaporation in helium.

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