Dielectric and AC Conductivity of Rockwool Fibers-Polystyrene Composites

Nofal, Omar M. M.; Zihlif, A. M.

doi:10.1177/0731684409357258

Cited by 11 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4,34 It is believed that the dielectric properties are greatly dependent on the polarization of molecules. 35,36 Due to the fact that PI has a very weak polarization, the increased dielectric constant of the m-AlN/PI composites with AlN can be mainly ascribed to the increased interfacial polarization effect and the high dielectric constant of AlN. 4,34 Figure 5(a) also demonstrates that the dielectric dissipation factor increases with the AlN loading.…”

Section: Morphological Analysismentioning

confidence: 96%

Manipulating thermal conductivity of polyimide composites by hybridizing micro- and nano-sized aluminum nitride for potential aerospace usage

Luo

Liu²,

Yang

et al. 2019

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

Electrically insulating yet thermally conductive polymer-based composites are highly sought after in aerospace field. In this work, for the first time, electrically insulating but thermally conductive polyimide (PI) composites are fabricated by simultaneously incorporating micro- and nano-sized aluminum nitride (AlN) particles via a simple, economic, and scalable method of ball milling and subsequent hot-pressing process. The thermal conductivity, dielectric, and mechanical properties of the PI composites depend on the ratio of micro-sized AlN (m-AlN) to nano-sized AlN (n-AlN) and the total content of AlN in the PI composites. The thermal conductivity of the PI composites with 40 wt% m-AlN and 20 wt% n-AlN is 1.5 ± 0.05 W·m−1·K−1, which is 10 times higher than that of bare PI. The PI composites hold a great potential in aerospace industries.

show abstract

Section: Morphological Analysismentioning

confidence: 96%

Manipulating thermal conductivity of polyimide composites by hybridizing micro- and nano-sized aluminum nitride for potential aerospace usage

Luo

Liu²,

Yang

et al. 2019

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

show abstract

“…Conductivity. Figure 5 shows the real conductivity results of the EVA and different EVA/GTR compounds at 30 C and 120 C. As it is usual in disordered materials 26 such as polymer composites, 27,28 the conductivity fits a sublinear dispersive model Equation (1): where 0 is the direct current (DC) conductivity, ! ¼ 2f, where f the frequency, while A and n (which have values between 0 and 1) the parameters which depend on the temperature and the material properties.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Study on dielectric, thermal, and mechanical properties of the ethylene vinyl acetate reinforced with ground tire rubber

Mujal-Rosas¹,

Prat²,

Ramis³

et al. 2011

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

Mass production of tires, as well as the difficult storage or elimination is a real environmental problem. Various methods for recycling tires are currently used, such as mechanical grinding, which puts vulcanized rubber, steel, and fibers apart. The rubber may be used in several industrial applications such as flooring, insulations, footwear, etc. The aim of this article focuses on finding a new application for the old used tires (GTR). Tire dust and recycled EVA thermoplastic have been mixed, and we have checked the maximum accepted values of GTR concentration that can be admitted while keeping dielectric, mechanical, and thermal properties within acceptable values, as well as initial polymer microstructure. This would allow including GTR in industrial applications of recycled EVA. The recycled tire dust which result from the industrial milling processes has been divided by sieve in three different categories according to the size of the particles (<200, 200—500, and >" xbd="654" xhg="622" ybd="1596" yhg="1560"/>500 µm). This has then been mixed with EVA in different GTR concentrations (0%, 5%, 10%, 20%, 40%, and 70%) in order to establish its conduct through electrical, mechanical, thermal, and microstructure tests, which will be held in a range of temperatures between 30°C and 120°C, and with a range of frequency between 1 × 10-2 and 3 × 106 Hz.Peer ReviewedPostprint (published version

show abstract

“…19 Owing to the relationship between the permittivity and the conductivity of PDCs, the permittivity will also increase with temperature. 20,21 However, for PDCbased pressure sensor, at elevated temperature, the increase in the permittivity of PDCs will result in the characteristic frequency of pressure sensor to decrease, which have been studied in detail previously. [22][23][24] Recently, Cheng et al 25 have presented a wireless passive pressure sensor using polymerderived silicoaluminum carbonitride (SiAlCN) ceramic, which could work reliably at 800°C.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the conductivity of PDCs will increase with temperature 19 . Owing to the relationship between the permittivity and the conductivity of PDCs, the permittivity will also increase with temperature 20,21 . However, for PDC‐based pressure sensor, at elevated temperature, the increase in the permittivity of PDCs will result in the characteristic frequency of pressure sensor to decrease, which have been studied in detail previously 22–24 .…”

Section: Introductionmentioning

confidence: 99%

Effect of the graphitization level of the free carbon on the temperature sensitivity of silicon carbonitride‐based pressure sensors

Huang

et al. 2021

J Am Ceram Soc

View full text Add to dashboard Cite

The transformation route of polymer to ceramic is also known as polymer-derived ceramics (PDCs), which exhibit excellent thermal stability, 1 oxidation/corrosion resistance, 2,3 creep resistance, 4 and these properties make them one of the best candidate materials for pressure sensors used in the harsh environment, especially in aero-engines. Moreover, PDCs also have excellent electrical properties, such as giant piezoresistivity, 5 low dielectric loss and dielectric constant, 6 and tunable conductivity. 7,8 These unique electrical properties of PDCs are strongly related to two regions in their microstructure: one is the amorphous phase(s) of Si containing, and the other is the amorphous free-carbon area containing defective carbon clusters. [9][10][11] When the pyrolysis temperature is less than 1400°C, the amorphous free-carbon phase of PDCs will experience graphitization process and form nanosized carbon clusters. Because the PDC conduction mechanisms are determined by the morphology and content of the free-carbon phase, the graphitization level of free carbon has an important effect on

show abstract

Dielectric and AC Conductivity of Rockwool Fibers-Polystyrene Composites

Cited by 11 publications

References 19 publications

Manipulating thermal conductivity of polyimide composites by hybridizing micro- and nano-sized aluminum nitride for potential aerospace usage

Manipulating thermal conductivity of polyimide composites by hybridizing micro- and nano-sized aluminum nitride for potential aerospace usage

Study on dielectric, thermal, and mechanical properties of the ethylene vinyl acetate reinforced with ground tire rubber

Effect of the graphitization level of the free carbon on the temperature sensitivity of silicon carbonitride‐based pressure sensors

Contact Info

Product

Resources

About