Article
Polymer Science
Yanhong Feng, Tao Chen, Shuo Gao, Xiaochun Yin, Guizhen Zhang
Summary: In order to enhance the thermal conductivity of PTFE-based composites, hBN and SiC fillers are added to the PTFE matrix. The composites prepared by PVM process show improved thermal conductivity compared to compression molding. The hBN/SiC/PTFE composites also maintain low dielectric constant and loss.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Polymer Science
Alexey Tsyganov, Maria Vikulova, Denis Artyukhov, Alexey Bainyashev, Vladimir Goffman, Alexander Gorokhovsky, Nikolay Gorshkov
Summary: In this study, polymer matrix composites of PTFE/KFTO(H) and PTFE/KFTO(H)@CB were produced and characterized using various methods. The addition of 2.5 wt.% carbon material in the polymer matrix composites was found to increase the permittivity and decrease the dielectric loss.
Article
Materials Science, Composites
Xiaotao Zhu, Zeming Fang, Ying Yi, Zeru Wang, Yeqiao Meng, Qianfa Liu, Ke Wang
Summary: This study successfully reduced the coefficient of thermal expansion (CTE) and improved the dielectric properties of polymer composites by incorporating Zr2WP2O12 (ZWP) particles. The performance of the PPO/ZWP composites was superior to that of traditional PPO/silica composites. Therefore, PPO/ZWP composites may be promising materials for high-frequency applications in electronic packaging fields.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Composites
Jian Zheng, Ming Gong, Wenying Zhou, Weiwei Peng, Fanrong Kong, Hongju Wu, Guangheng Wang, Huiwu Cai, Mengxue Yuan
Summary: In this study, SiO2 shells with different morphologies were constructed on the superficies of ss-SiCw to enhance the TC and dielectric performances of ss-SiCw@SiO2/PVDF. The composites showed significantly restricted loss and improved TC due to the suppression of direct contact between ss-SiCw and the hindered long-distance charges migration by the SiO2 shell. The crystalline SiO2 interlayer with a high TC achieved a more evident enhancement effect in the epsilon and TC but low loss of the composites.
POLYMER COMPOSITES
(2023)
Article
Engineering, Environmental
Yingchun Liu, Zhaoson Hu, Haohan Wu, Shiron Sun, Liheng Chen, Kun Wu, Xuliang Lin, Yanlin Qin
Summary: This paper demonstrates a multiscale BN modulation strategy for preparing dense thermal conductive networks (TCN) and simultaneously decreasing the interface thermal resistance (ITR) in polymer composites. The composites show enhanced thermal conductivity (x) and superior dielectric properties and thermal stability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Composites
Feihua Liu, Yinghai Jin, Jiayun Li, Wei Jiang, Weiwei Zhao
Summary: Polymer-ceramic dielectric composites, with the advantages of polymers and ceramic fillers, are widely used in microwave substrates due to their excellent dielectric properties, good mechanical properties, and easy formability. This study focused on enhancing compatibility between the polymer matrix and ceramic filler to optimize the properties of polytetrafluoroethylene (PTFE) composites. PTFE/SiO2 composites were prepared by demulsification treated PTFE and modifying SiO2 with silane treatment, resulting in improved mechanical properties, lower dielectric loss, and lower coefficient of thermal expansion (CTE) compared to untreated PTFE composites. These composites also exhibited low dielectric constant and loss even at frequencies up to 10 GHz.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Yongxiao Zhou, Chang Zhou, Zhijun Wang, Yiming Wu, Qiang Zhang, Jing Qiao, Gaohui Wu
Summary: The salient feature of low-expansion metal matrix composites is their dimensional stability. By using anti-perovskite manganese nitrogen compound as a thermal expansion inhibitor, high mechanical strength low-expansion composites have been successfully fabricated. The effects of fabricating temperature on the microstructure, thermal expansion, and mechanical properties of the composites have been discussed.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Mingxia Wang, Chaowei Zhong, Zhengyi Yang, Hongyu Yang, Lei Cao, Tianying Qin, Shuren Zhang
Summary: This paper investigates the thermal conduction, thermal expansion, and microwave dielectric properties of LixSi(0.50x to 0.65x)O(1.5x to 1.8x) (LS-based) ceramics. Adding 4 wt % of Al2O3 can significantly improve the thermal properties of the ceramics, making them suitable for the transition layer of circuit boards.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Junqing Ren, Pao Yang, Zhijian Peng, Xiuli Fu
Summary: Novel PTFE-based composites with different contents of Al2Mo3O12 modified by the coupling agent F8261 were successfully prepared, showing improved densification and dielectric properties. The addition of modified Al2Mo3O12 powders increased the εr value while tan delta remained relatively constant. Among the composites, those with 30 wt% Al2Mo3O12 demonstrated the optimal dielectric properties. These results suggest that the 30 wt% Al2Mo3O12 - 70 wt% PTFE composite could be a promising candidate for high-performance microwave dielectric substrates.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Yan Yu, Bin Huang, Yan Zhao, Yunfeng Zhao, Lina Dai, Zhijie Zhang, Hua-Feng Fei
Summary: Polysiloxane-based dielectric elastomers have great potential as electroactive soft materials, but their low permittivity has hindered practical applications. This study demonstrates that introducing cyanosilicone oil into the elastomer matrix can significantly increase the permittivity and enhance the dielectric relaxation processes. The resulting elastomer composites exhibit lower Young's modulus and dielectric loss.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Mechanical
Mingkun Xu, Zidan Wang, Lihe Guo, Liming Tao, Tianbao Ma, Tingmei Wang, Qihua Wang
Summary: Fabric composites are widely used in self-lubricating bearing liners, but their cryogenic tribological properties are poorly understood. This study investigates the tribological behavior of PTFE-based hybrid-fabric composites at cryogenic and ambient temperatures. The results show that the friction coefficients of the composites increase and wear decreases when the temperature decreases. Thermoplastic PEI adhesive exhibits better cryogenic lubrication performance compared to thermosetting PF resin. The excellent lubrication performance is attributed to the transfer film formed by PTFE fibers on the fabric surface.
Article
Agricultural Engineering
Asma Khouaja, Ahmed Koubaa, Hachmi Ben Daly
Summary: The project aims to develop new biocomposites using cellulose fibers to produce dielectric materials based on thermoplastic matrices. The addition of cellulose fibers increased the dielectric constant, the loss factor, and the conductivity of the materials compared to the neat polymer. Additionally, the volume resistivity of all the composites studied decreased with frequency and fiber content.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Materials Science, Multidisciplinary
Fei Sun, Hongji Lin, Jianan Fu, Zhen Li, Feng Luo, Bei Wang, Wenqing Ruan, Shuai Ren, Zhenxuan Zhang, Xiong Liang, Jiang Ma, Jun Shen
Summary: The study developed a method for preparing metallic glass matrix composites with precise control over their thermal expansion properties. By utilizing the unique thermoplasticity, mixtures with different thermal expansion properties were successfully bonded to metallic glasses. The prepared composites achieve continuous regulation of their coefficient of thermal expansion with high precision and can even exhibit nearly zero thermal expansion properties.
APPLIED MATERIALS TODAY
(2022)
Article
Materials Science, Ceramics
T. O. Soloviova, O. P. Karasevska, J. Vleugels, P. Loboda
Summary: The experimental study on the thermal expansion of polycrystalline LaB6-MeB2 ceramic composites revealed the phenomenon of negative thermal elongation (NTE) at different temperatures and identified the mechanism behind it.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Xianping Zhao, Yongjie Nie, Tengfei Zhao, Ke Wang, Bingchen Song, Shihu Yu, Shengtao Li
Summary: The study focused on the preparation of PTFE/BN composites and their effects on thermal properties, reflectance properties, arc ablation resistance, and AC dielectric breakdown performances. Experimental results showed that increasing BN loading enhanced thermal conductivity, thermal diffusivity, light reflectance, and arc ablation resistance performance of the composites. The AC breakdown strength was also improved due to the heat dissipation properties introduced by the BN fillers.