Electrical characterization of polymer matrix — TiO2 filler composites through isothermal polarization / depolarization currents and I–V tests

Open Physics ◽  
2014 ◽  
Vol 12 (4) ◽  
Author(s):  
Ilias Stavrakas ◽  
Dimos Triantis ◽  
George Hloupis ◽  
Konstantinos Moutzouris
Keyword(s):  
Polymer Matrix ◽  
Strong Dependence ◽  
Electrical Characterization ◽  
Power Laws ◽  
Dc Conductivity ◽  
Filler Concentration ◽  
Depolarization Current ◽  
Energy Storage Properties ◽  
Standard Models

AbstractSpecimens of polymer matrix — ceramic TiO2 filler composites were prepared. The contribution of the filler content on the electrical conductivity and energy storage properties of the samples was examined. I–V and Isothermal Polarization/Depolarization Current (IPC/IDC) measurements were conducted. Dc conductivity values directly calculated from the I–V curves exhibited excellent agreement with corresponding values derived from the IPC/IDC recordings. Standard models were employed for fitting the IPC/IDC data. In specific, the short and the very long depolarization times were fitted by use of power laws of different slopes, while the intermediate depolarization times were fitted as a sum of three exponential decays. The present study reveals a strong dependence of the depolarization and polarization processes, as well as of the dc conductivity, on the filler concentration.

Electrical Characterization of Carbon Fiber Polymer Matrix Composites

2009 ◽  
Author(s):  
Alan Zantout ◽  
Olesya I. Zhupanska
Keyword(s):  
Carbon Fiber ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Electrical Characterization ◽  
Matrix Composites ◽  
Resistance Heating ◽  
Experimental Procedure ◽  
High Uniformity ◽  
Carbon Fiber Polymer

This paper studies the response of carbon fiber polymer matrix composites subjected to DC electric currents. We have developed a new fully instrumented experimental setup that enables one to measure electric field characteristics (amperage, voltage, resistance) and temperature at the surface of the electrified composites in real time. The experimental procedure ensured a low contact resistance between the composite and electrodes, high uniformity in the density of the applied electric current, and low resistance heating. An extensive experimental study on the electrical characterization of carbon fiber polymer composites of different composition, ply sequence, thickness, etc. was conducted. The effect of the resistance heating was carefully analyzed through experimental analysis as well as the finite element modeling.

Thermophysical features of nanostructured polymer system based on polyurethane

2020 ◽  
Vol 42 (4) ◽  
pp. 269-276
Author(s):  
V.V. Davydenko ◽  
◽  
G.P. Syrovetz ◽  
Keyword(s):  
Physical Properties ◽  
Polymer Composite ◽  
Polymer Matrix ◽  
Strong Dependence ◽  
Polymer Network ◽  
Polymer Composition ◽  
Filler Concentration ◽  
Glass Temperature ◽  
Water Suspension ◽  
Polyurethane Composite

Polymer systems containing nanoparticles are new class of polymer composite materials. Polymer matrix filling influences on network polymer structure forming mechanism. The filler influence appears in formation features of the network structure both near the filler surface and in polymer matrix volume. Polymer solid surface (filler, substrate, etc.) interaction results in polymer chains movement restriction, that in fact is equivalent of additional polymer network physical knots formation. The polymer – filler interface presence may lead to both increasing of physical polymer knots average amount and decreasing it because of decreasing the polymer –polymer type physical bonds amount. This in turn determines strength of the polymer composite value. Polyurethane composite filled with different type of gypsum has been studied. The semi-aquatic gypsum (water suspension and dry powder) and two-aquatic gypsum water suspension were used as the filler. The polyurethane oligomer was used as reactive polymer matrix. Thermal-and-physical properties of polymer composites were studied by differential scanning calorimetry. It is found that the semi-aquatic gypsum does not transform in two-aquatic gypsum within polymer matrix during observation time. Evidently, the first – the polymer matrix doesn’t have continues pores and the second – the polymer matrix forms dense surface layer that hinders the diffusion of water vapor to the filler. Obtained polymer compositions glass temperature shows weak dependence on gypsum concentration and method of gypsum filling, but shows strong dependence on heating multiplicity. Polymer composition change in heat capacity upon glass transition value ∆Cp decreases with filler concentration increases and strongly depends on filling process. To obtain stable material properties the annealing of internal strength is needed to carry out. Key words: polyurethane composite, gypsum, thermal-and-physical properties.

CBED analysis of impurity distributions in AlN

1990 ◽  
Vol 48 (4) ◽  
pp. 214-215
Author(s):  
Daniel Callahan ◽  
G. Thomas
Keyword(s):  
Aluminum Nitride ◽  
Bulk Material ◽  
Strong Dependence ◽  
Lattice Parameter ◽  
Promising Technique ◽  
Nitride Ceramics ◽  
Surface Phases ◽  
Convergent Beam ◽  
Oxygen Impurities

Oxygen impurities may significantly influence the properties of nitride ceramics with a strong dependence on the microstructural distribution of the impurity. For example, amorphous oxygen-rich grain boundary phases are well-known to cause high-temperature mechanical strength degradation in silicon nitride whereas solutionized oxygen is known to decrease the thermal conductivity of aluminum nitride. Microanalytical characterization of these impurities by spectral methods in the AEM is complicated by reactions which form oxygen-rich surface phases not representative of the bulk material. Furthermore, the impurity concentrations found in higher quality ceramics may be too low to measure by EDS or PEELS. Consequently an alternate method for the characterization of impurities in these ceramics has been investigated.Convergent beam electron diffraction (CBED) is a promising technique for the study of impurity distributions in aluminum nitride ceramics. Oxygen is known to enter into stoichiometric solutions with AIN with a consequent decrease in lattice parameter.

Structural and Electrical Characterization of Shaped Beam Laser Recrystallized Polysilicon on Amorphous Substrates

1981 ◽  
Vol 4 ◽  
Author(s):  
T. J. Stultz ◽  
J. F. Gibbons
Keyword(s):  
Grain Size ◽  
Electrical Characterization ◽  
Grain Structure ◽  
Electrical Characteristics ◽  
Shaped Beam ◽  
Beam Laser ◽  
Cw Laser ◽  
Amorphous Substrates ◽  
Circular Beam

ABSTRACTStructural and electrical characterization of laser recrystallized LPCVD silicon films on amorphous substrates using a shaped cw laser beam have been performed. In comparing the results to data obtained using a circular beam, it was found that a significant increase in grain size can be achieved and that the surface morphology of the shaped beam recrystallized material was much smoother. It was also found that whereas circular beam recrystallized material has a random grain structure, shaped beam material is highly oriented with a <100> texture. Finally the electrical characteristics of the recrystallized film were very good when measured in directions parallel to the grain boundaries.

Vapor Deposition Polymerization and Electrical Characterization of TPD Thin Films

2011 ◽  
Vol E94-C (2) ◽  
pp. 157-163 ◽  
Author(s):  
Masakazu MUROYAMA ◽  
Ayako TAJIRI ◽  
Kyoko ICHIDA ◽  
Seiji YOKOKURA ◽  
Kuniaki TANAKA ◽  
...  
Keyword(s):  
Thin Films ◽  
Vapor Deposition ◽  
Electrical Characterization
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