Join us at the International Thermal Conductivity Conference (ITCC) and the International Thermal Expansion Symposium (ITES).
In this study, variations of thermal properties that depend on the injection molding technique were analyzed. Thermal conductivity was measured using a two-sided a transient plane source method. Results indicate that polytetrafluoroethylene (PTFE) is the most significant raw material on short glass fiber (SGF) and PTFE- reinforced polycarbonate (PC) composites for thermal conductivity. This approach can effectively help in determining the optimal mixture ratio settings for reinforcement under multi-response consideration.
The phase behavior of polymeric materials is understood through glass transition temperature. It is a temperature boundary above which the polymeric material is soft and viscous, and becomes hard, brittle, and glassy below this temperature. In the present work, PS/PMMA immiscible polymer blend samples are studied at different compositional ranges. Thermal transport properties of PS/PMMA polymeric blends were measured , from room temperature to 120°C. Variation in thermal conductivity and diffusivity of PS, PMMA, and PS/PMMA blends suggest a continuous structural change taking place. All PS/PMMA blends have a maximum thermal conductivity and diffusivity in the glass transition region.
Semiconductor chalcogenide glasses are used in a wide range of applications as solid-state devices, both in scientific and technological fields. In this article, the mechanism of degradation of these materials is studied. The technique was used to measure the variation of thermal conductivity and thermal diffusivity of samples with different exposure times to neutron irradiation. Thermal conductivity and diffusivity increases proportionally with smaller exposure time, while at higher exposure times a decrease of thermal conductivity is observed.
Vacuum insulation panels (VIPs) are highly insulative materials that have industrial applications. This study aimed to replace glass fibers (GF) and fumed silica (FS) in VIPs with diatomaceous earth (DE) and glass bubbles (GB) to reduce the production cost and lengthen the service life of VIPs. Three experiments were carried out using a thermal constants analyzer based on the transient plane source (TPS) method to determine the effectiveness of DE and GB in the use of VIPs. In the first experiment, adding DE and GB particles to the composite materials significantly improved their thermal conductivities. In the second experiment, it was determined that the introduction of GB to a FS composite generated identical thermal conductivity values to pure FS. In the third experiment, a theoretical model successfully predicted the thermal conductivity of ceramic and metal particles. Collectively, the experiments demonstrated that DE and GB composites could lengthen the service life of VIPs while reducing production costs in the future.
