Polymer paperDielectric relaxations of microstructurally different latex polymer blends of poly(butyl acrylate) and poly(vinyl acetate)
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Synthesis and characterization of PTFE/(Na<inf>x</inf>Li<inf>1-x</inf>)<inf>0.5</inf>Nd<inf>0.5</inf>TiO<inf>3</inf> composites with high dielectric constant and high temperature stability for microwave substrate applications
2019, Ceramics InternationalCitation Excerpt :Prior to XRD, FTIR and XPS testing, samples were rinsed for 2 h to avoid physical attachment between F8261 and the surface of sample. Referring to the report of Murali [14], hygroscopicity of substrate of this experiment was tested according to the IPC-TM-650 2.6.2 standard. Density of the composite samples was measured using an AND 300 densitometer tester.
Modification of Si<inf>3</inf>N<inf>4</inf> ceramic powders and fabrication of Si<inf>3</inf>N<inf>4</inf>/PTFE composite substrate with high thermal conductivity
2019, Ceramics InternationalCitation Excerpt :The dielectric constant and dielectric loss near 10 GHz were measured by a stripline resonator method using an Agilent E8363A microwave network analyzer according to the IPCTM-650 2.5.5.5 specification [20]. Finally, the density of the composite substrate was tested by the Archimedes principle, and the moisture absorption of the composite substrate with different Si3N4 ceramic filler contents was measured according to IPC-TM-650 2.6.2 [21]. Fig. 1 shows the pH changes of various concentrations of F8261 modified and unmodified Si3N4 powders under ultrasonic vibration at room temperature.
Fabrication of 0.8BaTi<inf>4</inf>O<inf>9</inf>-0.2BaZn<inf>2</inf>Ti<inf>4</inf>O<inf>11</inf> filled and glassfiber reinforced polytetrafluoroethylene composites with near-zero temperature coefficient of dielectric constant
2018, Journal of Alloys and CompoundsCitation Excerpt :The contact angle of BZT powder was measured by model DSA25-Kruss according to sessile drop method. The density of composites were characterized by Archimedes' principle, and the moisture absorption of the composite sample was measured, reported earlier by Murali, according to IPC-TM-650 2.6.2 [26]. The dielectric properties and temperature coefficient of dielectric constant (τε) around 10 GHz were measured using Agilent E8363A microwave network analyzer by stripline resonator method according to IPC-TM-650 2.5.5.5 specification [27].
Microstructure and microwave dielectric properties of Na <inf>1/2</inf> Sm <inf>1/2</inf> TiO <inf>3</inf> filled PTFE, an environmental friendly composites
2018, Applied Surface ScienceCitation Excerpt :The morphology of the GF, ceramic powders and the surface microstructure of the composites were obtained by scanning electron microscopy (SEM, model JEOL JSM-6490). Water absorption of the composite sample was measured as reported earlier by Murali etc. according to IPC-TM-650 2.6.2 [16]. The crystal phase of NST powder and substrate composite were identified by X-ray powder diffraction (XRD) using a Philips X’prt diffractometer.
MgTiO<inf>3</inf> filled PTFE composites for microwave substrate applications
2013, Materials Chemistry and PhysicsCitation Excerpt :It can be seen that PTFE fibrils are enriched on the surface and no ceramic filler particles are observed. The dielectric properties of the composites depend on not only the relative permittivity of the components but also other factors such as the dispersion of fillers, morphology and size of fillers and the interactions between ceramics and polymers [8–11]. The variation of dielectric constant and loss tangent of the composites as a function of MT filler loading is shown in Fig. 5.
Dielectric properties of natural rubber/chitosan blends: Effects of blend ratio and compatibilization
2011, Journal of Non-Crystalline SolidsCitation Excerpt :Most of the polymers are excellent insulating materials and they are less susceptible to conduction by imperfection and structural irregularities, which made them an attractive choice for electrical applications. Electrical properties of various polymer blends have been investigated by different researchers [2–8]. In these reports it has been shown that the dielectric properties of polymers and blends in general depend on structure, crystallinity, morphology and presence of fillers or other additives.
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