Influence of Carbon Nanofibers and Piezoelectric Particles on the Thermomechanical Behaviour of Epoxy Mixtures

2007 ◽  
Vol 121-123 ◽  
pp. 1419-1424 ◽  
Author(s):  
S. Tsantzalis ◽  
P. Tsotra ◽  
P. Karapappas ◽  
A. Vavouliotis ◽  
N. Fanis ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Mechanical Analysis ◽  
Scanning Calorimetry ◽  
Vapor Growth ◽  
Curing Reaction ◽  
Thermomechanical Behaviour ◽  
Dynamic Thermal Mechanical Analysis ◽  
Thermal Mechanical Analysis

Vapor growth carbon nanofibers (CNFs), lead zirconate titanate piezoelectric (PZT) particles, as well as a combination of these two were added in an epoxy resin (EP), and their influence on the curing reaction was investigated. Moreover, the cured samples were characterised by dynamic scanning calorimetry and dynamic thermal mechanical analysis. The presence of the fillers had no significant effect of the curing reaction of the EP system and the glass transition temperature, Tg.

Dynamic characterization of structural relaxation in V2O5–P2O5 bulk oxide glass

2019 ◽  
Vol 21 (27) ◽  
pp. 14879-14886
Author(s):  
Shaolai Wu ◽  
Debo Wang ◽  
Yuyong Zhong ◽  
Xiaohui Fang ◽  
Yongjun Chen ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Structural Relaxation ◽  
Mechanical Analysis ◽  
Oxide Glass ◽  
Dynamic Characterization ◽  
Scanning Calorimetry ◽  
Complete Relaxation ◽  
Dynamic Thermal Mechanical Analysis ◽  
Thermal Mechanical Analysis

The characteristic changes and the complete relaxation process of V2O5–P2O5 oxide glass are studied by dynamic thermal-mechanical analysis and differential scanning calorimetry.

Thermal and Mechanical Properties of Cyclized Polybutadiene Dielectrics

1986 ◽  
Vol 76 ◽  
Author(s):  
C. W. Wilkins ◽  
H. E. Bair ◽  
M. G. Chan ◽  
R. S. Hutton
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Physical And Mechanical Properties ◽  
Mechanical Analysis ◽  
Infrared Analysis ◽  
Thermal And Mechanical Properties ◽  
Scanning Calorimetry ◽  
The Difference ◽  
Thermal Mechanical Analysis ◽  
Lower Glass Transition Temperature

ABSTRACTWe have studied some of the physical and mechanical properties of cyclized polybutadiene (CBR) dielectrics by dynamic mechanical analysis, thermal mechanical analysis, thermogravimetry, infrared analysis, and differential scanning calorimetry. Of interest is the difference in properties between thin (<30 μm) films which have been cured under vacuum and those which have been cured in air. Our results indicate that curing under vacuum prevents oxidation and reduces crosslinking. Vacuum cured films have 20% smaller moduli and 200 lower glass transition temperature than do films produced in air.

Pad Degradation During CMP Process: Effect of Soak in Slurry and Water on Thermal and Mechanical Properties of the CMP Pads

2003 ◽  
Vol 767 ◽  
Author(s):  
A. Tregub ◽  
G. Ng ◽  
M. Moinpour
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Thermal Gravimetric Analysis ◽  
Mechanical Analysis ◽  
Gravimetric Analysis ◽  
Thermal And Mechanical Properties ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Thermal Mechanical Analysis

AbstractSoak of polyurethane-based CMP pads in tungsten slurry and de-ionized water and its effect on retention of thermal and mechanical properties of the pads was studied using Dynamic Mechanical Analysis (DMA), Thermal Mechanical Analysis (TMA), Thermal Gravimetric Analysis (TGA), and Modulated Differential Scanning Calorimetry (MDSC). Simultaneous cross-linking and plastisizing due to soak were established using DMA and MDSC analysis. The stable operating temperature range and its dependence on soak time were determined using TMA analysis. Substantial difference in diffusion behavior of the “soft” and “hard” pads was discovered: diffusion into the hard pads followed Fickian law [1], while diffusion into the multi-layer soft pads was dominated by the fast filling of the highly porous pad surface with liquid.During a traditional CMP process, which involves application of polishing pads and slurry, the pad properties can be substantially and irreversibly changed as the result of slurry/rinse water absorption.The retention of the pad properties after exposure was monitored using such thermal and mechanical techniques, as Thermal Mechanical Analysis (TMA), Dynamical Mechanical Analysis (DMA), Modulated Differential Scanning Calorimetry (MDSC), Thermal Gravimetric Analysis (TGA).

scholarly journals Lightweight and Durable PVDF–SSPF Composites for Photovoltaics Backsheet Applications: Thermal, Optical and Technical Properties

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2104 ◽  
Author(s):  
M. H. Alaaeddin ◽  
S. M. Sapuan ◽  
M. Y. M. Zuhri ◽  
E. S. Zainudin ◽  
Faris M. AL- Oqla
Keyword(s):  
Polyvinylidene Fluoride ◽  
Mechanical Analysis ◽  
Short Fiber ◽  
Photovoltaic Module ◽  
Scanning Calorimetry ◽  
Sugar Palm Fiber ◽  
Technical Properties ◽  
Critical Components ◽  
Thermal Mechanical Analysis

Photovoltaic module backsheets are characterized according to their thermal, optical, mechanical, and technical properties. This work introduces new fabricated backsheets for PV modules using polyvinylidene fluoride (PVDF) reinforced with short sugar palm fiber (SSPF) composites. The preparation of composites undergoes multiple phases of fabrication. Thermal, optical, and technical investigations of their properties were conducted. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, in-situ scanning probe microscopy (SPM), dynamic mechanical analysis (DMA), thermal mechanical analysis (TMA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and prolonged technical testing were accomplished to expansively understand the complex behavior of composites under various conditions. The optical properties of PV backsheets are critical components in determining the reflectance, absorbance, and transmittance of light. The PVDF–SSPF composites exhibited exceptional compatibility and thermal stability, further revealing a homogenous composite structure with enhanced interfacial bonding between the short fiber and polymer matrix.

DEVELOPMENT OF PEROVSKITE INPrSUBSTITUTEDPb(Zr0.52Ti0.48)O3AND DIELECTRIC CHARACTERISTIC

2006 ◽  
Vol 20 (21) ◽  
pp. 3071-3080 ◽  
Author(s):  
N. UDOMKAN ◽  
P. LIMSUWAN ◽  
P. WINOTAI ◽  
T. TUNKASIRI
Keyword(s):  
Lead Zirconate Titanate ◽  
Ferroelectric Property ◽  
Piezoelectric Properties ◽  
Pyrochlore Phase ◽  
Hysteresis Loops ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Dopant Content ◽  
X Ray

The purpose of this research is to investigate the structure of lead zirconate titanate ceramics ( Zr:Ti =52:48) when doped with Pr2O3and the corresponding properties such as micro-structural properties, physical properties, dielectric constant (εr), piezoelectric properties (kp, Qm, and d33), and the ferroelectric property. The materials were prepared via conventional mixed oxide method and sintered at 1200°C. The Rietveld refinement of X-ray diffraction patterns and combination of both patterns revealed the tetragonal structure for all samples to have space group of P4mm. For higher dopant content (10 mol%), the pyrochlore phase of Pr2O3also appeared in the respective samples. These pyrochlore phases caused the detriment of dielectric and piezoelectric properties. For those with lower dopant content (1.00 mol%), the Pr ion substituted at the A and B sites with isovalent dopant effects, i.e. a lower value of εr, and kp. The hysteresis loops indicated the ferroelectric property for all samples. The microstructure showed dense grain according to a high density and the additional phases of Pr2O3were clearly observed for 10 mol% doping. The Curie temperature decreased with increasing dopant content, as determined from high temperature X-ray diffraction and differential scanning calorimetry.

Microstructural Changes During Processing of Laser-Deposited BaTiO3 and Pzt Thin Films

1990 ◽  
Vol 202 ◽  
Author(s):  
L. P. Cook ◽  
M. D. Vaudin ◽  
P. K. Schenck ◽  
W. Wong-Ng ◽  
C. K. Chiang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Hysteresis Loops ◽  
Lead Zirconate ◽  
Scanning Calorimetry ◽  
Microstructural Changes ◽  
X Ray ◽  
Substrate Heating ◽  
Ferroelectric Hysteresis

ABSTRACTThin films of BaTiO3 and PZT (lead zirconate titanate, 47%PbTiO3, 53%PbZrO3) have been produced by laser irradiation of the appropriate ceramic targets and deposition of the ejected and vaporized material on planar substrates. The microstructural changes during thermal processing of these films have been studied by scanning electron microscopy/energy dispersive x-ray spectrometry (SEM/EDX), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), x-ray diffraction (XRD), and by measurement of electrical properties. Films have been deposited using both Nd/YAG and excimer lasers and on unheated as well as heated substrates. Excimer films are considerably smoother than the Nd/YAG films, and the uniformity of the as-deposited microstructures is promoted by substrate heating. However, ferroelectric hysteresis loops were only observed for the considerably less smooth Nd/YAG PZT films; thermal treatment did little to improve the smoothness of these films. An excimer BaTiO3 film deposited on a heated substrate showed crystallographic alignment and had a dielectric constant of −100. Efforts are underway to combine the best features of films produced by both methods.

scholarly journals Thermal analysis study of polymer-to-ceramic conversion of organosilicon precursors

2008 ◽  
Vol 44 (1) ◽  
pp. 35-38 ◽  
Author(s):  
D. Galusek ◽  
Z. Lencés ◽  
P. Sajgalík ◽  
Ralf Riedel
Keyword(s):  
Thermal Analysis ◽  
Mechanical Analysis ◽  
Cross Linking ◽  
Oxide Ceramics ◽  
Ceramic Yield ◽  
Scanning Calorimetry ◽  
Analysis Study ◽  
Thermal Analysis Study ◽  
Thermal Mechanical Analysis ◽  
Significant Attention

The organosilicon precursors attract significant attention as substances, which upon heating in inert or reactive atmosphere convert directly to oxide or non-oxide ceramics, like nitrides, carbides, carbonitrides, boroncarbonitrides, oxycarbides, alons, etc. In characterisation, and in study of conversion of these polymers to ceramics thermal analysis plays an important role. The degree of cross-linking of the polymer vital for achievement of high ceramic yield is estimated with the use of thermal mechanical analysis (TMA). Decomposition of polymers and their conversion to ceramics is studied by the combination of differential thermal analysis (DTA), differential scanning calorimetry (DSC) thermogravimetry(TG), and mass spectrometry (MS). The use of these methods in study of the polymer-to-ceramic conversion is illustrated by case studies of a commercially available poly(allyl)carbosilane as the precursor of SiC, and a poly(hydridomethyl)silazane as the precursor of SiCN.

scholarly journals Facile Fabrication of a Novel PZT@PPy Aerogel/Epoxy Resin Composite with Improved Damping Property

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 977 ◽  
Author(s):  
Chunmei Zhang ◽  
Yuchao Li ◽  
Yanhu Zhan ◽  
Qian Xie
Keyword(s):  
Epoxy Resin ◽  
Lead Zirconate Titanate ◽  
In Situ Polymerization ◽  
Resin Composite ◽  
Three Dimensional ◽  
Lead Zirconate ◽  
Mechanical Analysis ◽  
Damping Property ◽  
Zirconate Titanate ◽  
Filling Method

A novel lead zirconate titanate@polypyrrole (PZT@PPy) aerogel (PPA) was fabricated via in-situ polymerization and subsequent freeze-drying method. The porous PPA was then saturated with epoxy resin to obtain the PPA/epoxy composite (PPAE) by a simple vacuum filling method. In this way, the filler content and dispersion uniformity are well guaranteed, which is in favor of improving the damping and mechanical properties of composites. The morphology and structure of PPAs were investigated using XRD, SEM, EDS and nitrogen absorption and desorption measurements. The results showed that the PPA possessed a three-dimensional porous structure with uniform lead zirconate titanate (PZT) distribution. The influence of PZT content on the damping property of PPAE composite was investigated by dynamic mechanical analysis (DMA). PPAE-75 (i.e., the mass ratio of PZT to PPy is 75 wt %) exhibited the maximum damping loss factor value, 360% higher than that of the epoxy matrix, suggesting good structural damping performance.

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