Characterization of the thermophysical properties of molten plymers and liquids using the flash technique

Abstract

Characterization of liquids, pastes, and melts is nowadays becoming increasingly important for industrial applications. The thermal conductivity of a heat-transfer paste is, for example, one of the crucial parameters for the application of the material, and characterization of polymers in the liquid range is important for the analysis and optimization of the production processes. A new container system has been developed allowing flash measurements to be carried out on liquids, pastes, and molten polymers. Technical details of the container and the data on processing techniques are presented. Reliability tests (on water) have also been carried out and the results are compared with literature values. Various application examples for liquids, pastes, and polymers, through the melt stage are reported.

Scanning thermal microscopy techniques for polymeric thin films using temperature contrast mode to measure thermal diffusivity and a novel approach in conductivity contrast mode to the mapping of thermally conductive particles

“…7). On its own, 8,9, 11 to 15 0.008 Blumm and Lindemann [19] Polycarbonate 0.145 Blumm and Lindemann [19] Polypropylene 0.095 Blumm and Lindemann [19] Paraffin mixture 0.090…”

“…The laser flash technique used by Blumm and Lindemann [19] is a well-known and established measurement method within the polymer industry for determining the thermal diffusivity values for polymeric materials. Validation of the newly developed system as a measurement technique rests with the thermal diffusivity value for Film 1 of 0.105 mm 2 /s obtained experimentally using this system falling within the range for polymers and a polymeric mixture measured by the laser flash instrument ( Table 3).…”

“…This flash tube based method has been replaced by the laser flash method, which is now the most commonly used to measure thermal diffusivity of polymers. Blumm et al [19,20] and Dos Santos [21] have measured the thermal diffusivity of a range of amorphous and semi-crystalline polymers using laser flash.…”

Thermal diffusivity measurement of Phyllostachys edulis (Moso bamboo) by the flash method

“…The pure solid materials have relatively higher ThD values followed by gases and alloys. The ThD of polymers and porous materials is at a relatively lower level (Jams 1968;Blumm and Lindemann 2003;Wilson 2007;Casalegno et al 2010;Bergman et al 2011). It was postulated that porosity is an important factor in this regard.…”

3D Printed Programmable Release Capsules

“…We assume that α is similar to the thermal diffusivity of water, 0.143 × 10 −6 m 2 /s; 50 T i = 22 °C, and since the melting temperature of the polymer is 40–60 °C, we used T s = 50 °C. To determine the heating impact on the microenvironment, it is useful to calculate the heat penetration depth ( t pen ) into the surrounding hydrogel, as excessive heating may cause cell damage.…”