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"Glass transition temperature"

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"Glass transition temperature"

Sintering Behavior of Borate-Based Glass Ceramic Solid Electrolytes for All-Solid Batteries
Jeong Min Lee, Dong Seok Cheong, Sung Hyun Kang, Tirtha Raj Acharya, Eun Ha Choi, Weon Ho Shin
J Electr Electron Mater 2024;37(4):445-450.   Published online July 1, 2024
DOI: https://doi.org/10.4313/JKEM.2024.37.4.13
The expansion of lithium-ion battery usage beyond portable electronic devices to electric vehicles and energy storage systems is driven by their high energy density and favorable cycle characteristics. Enhancing the stability and performance of these batteries involves exploring solid electrolytes as alternatives to liquid ones. While sulfide-based solid electrolytes have received significant attention for commercialization, research on amorphous-phase glass solid electrolytes in oxide-based systems remains limited. Here, we investigate the glass transition temperatures and sintering behaviors by changing the molecular ratio of Li2O/B2O3 in borate glass comprising Li2O-B2O3-Al2O3 system. The glass transition temperature is decreasing as increasing the amount of Li2O. When we sintered at 450℃, just above the glass transition temperature, the samples did not consolidate well, while the proper sintered samples could be obtained under the higher temperature. We successfully obtained the borate glass ceramics phases by melt-quenching method, and the sintering characteristics are investigated. Future studies could explore optimizing ion conductivity through refining processing conditions, adjusting the glass former-to-modifier ratio, and incorporating additional Li salt to enhance the ionic conductivity.
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A Study on Frequency Dependence on Dielectric Properties of Silicone Rubber Sheets
Sung Ill Lee
J Electr Electron Mater 2020;33(5):405-410.   Published online September 1, 2020
DOI: https://doi.org/10.4313/JKEM.2021.33.5.12
In this study, the following results were obtained by analysis of electric properties with FT-IR, DSC, XRD, and SEM, in the range of temperature 30~160℃ and frequency 0.1~200 kHz, when filling agent (0~100 phr) and silicone oil (0~12 phr) were added to raw silicone rubber. In the case of 100 phr mixed samples, the relative dielectric constant εr gradually decreased from 4.3 to 3.96 as frequency increased, and the dielectric loss tan δ decreased to 0.01 at 300 Hz, then increased to 0.022 at 30 kHz, then decreased to 200 kHz. The FT-IR analysis identified the same binding structure according to the chemical composition of added silica (SiO2). Through DSC analysis, we could determine the change of heat quantity and the glass transition temperature of each specimen. In the XRD analysis, it was found that the images SiO2, TiO2, and Fe2O3 appeared for specimens with 0%, 50% and 100% filling agent. Finally, the SEM analysis confirmed that particles of 0.5 to 1.5 μm size with silica (SiO2) mixing were dispersed evenly.
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Insulation Materials : Dispersion Properties of Epoxy-Iayered Silicate Nanocomposites Using Homogenizer
Sang Keuk Lee, Jae Jun Park
J Electr Electron Mater 2013;26(2):126-133.   Published online February 1, 2013
This paper presents a study on the dispersion effect of the X-Ray diffraction, glass transition and DIMA properties of organic modifier clay/epoxy nanocomposites produced in a homogenizer. Several experiments were conducted including different types of dispersion condition with varying processing conditions such as homogenizer rotor speed and applied time of homogenizer. The effects of these variables on the dispersion properties of nanocomposites were then studied. In order to fully understand the experimental results, a X-ray diffraction, DSC and DMA were used to investigate the effect of above mentioned variables on microstructure and intercalation/exfoliation of organic modifier clay/epoxy nanocomposites. The results from this work could be used to determine the best processing condition to obtain appropriate levels of d-spacing, glasss transition temperature and storage modulus in organic modifier clay/epoxy nanocomposites.
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Physical Properties of Green Sheets According to Glass Transition Temperature of Binder
Hyeok Jung Kwon, Hyo Soon Shin, Dong Hun Yeo
J Electr Electron Mater 2013;26(1):33-37.   Published online January 1, 2013
The properties of LTCC green sheets formed by the MLS-22 powder of NEG Inc. were investigated for acrylic binders with different PVB and Tg in the variation of temperature. The elongation of the green sheets showed large variation depending on the temperature, and was rapidly decreased near the Tg of the sheets. With the increase of the ratio of plasticizer/binder (P/B), large elongation of the sheets was observed due to the decrease of the Tg. In the stacking process of the multilayer ceramic, the optimal control of the temperature is highly required depending on the Tg of the binder and the ratio of P/Buniform coating.
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