Effect of filler structure on the dielectric and thermal properties of SiO2/PTFE composites

Han, Kunkun; Zhou, Jing; Li, Qiangzhi; Shen, Jie; Qi, Yanyuan; Yao, Xiaoping; Chen, Wen

doi:10.1007/s10854-020-03449-w

Cited by 24 publications

(8 citation statements)

References 29 publications

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“…It is, therefore, evident that the decrease in filler size matched the drop in the CTE of the composites [ 8 , 36 ]. The variation is first attributed to the mismatch in the CTE of the PTFE matrix (

109 ppm/°C) and the recycled BRS filler (~4 ppm/°C [ 40 , 41 ]. In addition, smaller-sized filler particles have a larger surface area and higher density.…”

Section: Resultsmentioning

confidence: 99%

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

et al. 2021

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Low dielectric loss and low-cost recycled borosilicate (BRS) glass-reinforced polytetrafluoroethylene (PTFE) composites were fabricated for microwave substrate applications. The composites were prepared through a dry powder processing technique by dispersing different micron sizes (25 µm, 45 µm, 63 µm, 90 µm, and 106 µm) of the recycled BRS filler in the PTFE matrix. The effect of the filler sizes on the composites’ thermal, mechanical, and dielectric properties was studied. The dielectric properties of the composites were characterised in the frequency range of 1–12 GHz using an open-ended coaxial probe (OCP) connected to a vector network analyser (VNA). XRD patterns confirmed the phase formation of PTFE and recycled BRS glass. The scanning electron microscope also showed good filler dispersion at larger filler particle sizes. In addition, the composites’ coefficient of thermal expansion and tensile strength decreased from 12.93 MPa and 64.86 ppm/°C to 7.12 MPa and 55.77 ppm/°C when the filler size is reduced from 106 μm to 25 μm. However, moisture absorption and density of the composites increased from 0.01% and 2.17 g/cm3 to 0.04% and 2.21 g/cm3. The decrement in filler size from 106 μm to 25 μm also increased the mean dielectric constant and loss tangent of the composites from 2.07 and 0.0010 to 2.18 and 0.0011, respectively, while it reduced the mean signal transmission speed from 2.088 × 108 m/s to 2.031 × 108 m/s. The presented results showed that PTFE/recycled BRS composite exhibited comparable characteristics with commercial high-frequency laminates.

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109 ppm/°C) and the recycled BRS filler (~4 ppm/°C [ 40 , 41 ]. In addition, smaller-sized filler particles have a larger surface area and higher density.…”

Section: Resultsmentioning

confidence: 99%

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

et al. 2021

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“…Copper‐clad laminates for polyolefin generally need to add a certain amount of filler to improve the overall performance of the copper‐clad laminate [10–12] . Silicon dioxide has a low dielectric constant, the advantages of high thermal stability, rigidity and easy preparation, which can improve the thermal stability and mechanical properties of polymer materials [13–16] . The hydrocarbon resin system usually uses chemical cross‐linking to convert the polymer from a linear structure to a three‐dimensional network structure.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12] Silicon dioxide has a low dielectric constant, the advantages of high thermal stability, rigidity and easy preparation, which can improve the thermal stability and mechanical properties of polymer materials. [13][14][15][16] The hydrocarbon resin system usually uses chemical cross-linking to convert the polymer from a linear structure to a three-dimensional network structure. The peroxides can be used as initiators for cross-linking and curing due to hydrocarbon resins containing C=C unsaturated double bonds.…”

Section: Introductionmentioning

confidence: 99%

Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO₂/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide

et al. 2022

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Polymer materials with low dielectric constant and dielectric loss play an indispensable role in high speed and stable signal transmission of electronic components. In this work, the SiO 2 / 1,2-polybutadiene/ styrene-butadiene-styrene triblock copolymer/ ethylene-propylene-diene terpolymer (SiO 2 /1,2-PB/SBS/ EPDM) composites were prepared with different content of organic peroxide (bis (1-(tert-butyl peroxide)-1-methyl ethyl)benzene, BIPB). A high degree of crosslinking reaction may occur during the curing process. Attenuation total reflectance Fourier transformation infrared spectrometry (ATR-FTIR) analysis showed that the degree of C=C conversion (DC) increased with the increase of BIPB content, and the dielectric constant of the composites was reduced. However, the dielectric loss decreased initially and subsequently increased. The excess initiators transform into impurities and increase the polarization and conductivity, resulting in a larger dielectric loss value of the composite. The combined results show that the DC value of 92.76 %, the dielectric constant of 3.37 and the dielectric loss of 0.0028 were obtained for the SiO 2 /1,2-PB/SBS/EPDM composites containing 3 part-by-weight (pbw) BIPB. Furthermore, the composite had good thermal stability and superior mechanical properties.

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“…However, low wear resistance and insufficient mechanical properties limit the possibility of their use in unfilled form [ 12 ]. For PTFE, there is a possibility for the effective purposeful regulation of operational characteristics by filling [ 13 , 14 , 15 ]. It has been practically established [ 16 , 17 , 18 ] that in order to maintain at least 60–70% strength and 50% relative elongation of pure PTFE, the volume fraction of the introduced fillers should not exceed 20%.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Polymer Composite Materials Chaotically Reinforced with Spherical and Cylindrical Inclusions

et al. 2022

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The technical and economic efficiency of new PCMs depends on the ability to predict their performance. The problem of predicting the properties of PCMs can be solved by computer simulation by the finite element method. In this work, an experimental determination of the physical and mechanical properties of PTFE PCMs depending on the concentration of fibrous and dispersed filler was carried out. A finite element model in ANSYS APDL was built to simulate the strength and load-bearing capacity of the material with the analysis of damage accumulation. Verification of the developed computer model to predict the mechanical properties of composite materials was performed by comparing the results obtained during field and model experiments. It was found that the finite element model predicts the strength of chaotically reinforced spherical inclusions of composite materials. This is due to the smoothness of the filler surfaces and the lack of filler dissection in the model. Instead, the prediction of the strength of a finite element model of chaotically reinforced cylindrical inclusions of composite materials requires additional analysis. The matrix and the fibrous filler obviously have stress concentrators and are both subject to the difficulties of creating a reliable structural model.

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Effect of filler structure on the dielectric and thermal properties of SiO2/PTFE composites

Cited by 24 publications

References 29 publications

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO₂/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide

Modeling of Polymer Composite Materials Chaotically Reinforced with Spherical and Cylindrical Inclusions

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Effect of filler structure on the dielectric and thermal properties of SiO2/PTFE composites

Cited by 24 publications

References 29 publications

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO2/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide

Modeling of Polymer Composite Materials Chaotically Reinforced with Spherical and Cylindrical Inclusions

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Product

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Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO₂/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide