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11. Analysis of the influence of microencapsulated phase change materials on the behavior of a new generation of thermo-regulating shape memory polyurethane fibers

Author

Química física, Kimika fisikoa, Laza Terroba, José Manuel, Veloso Fernández, Antonio, Sánchez Bodón, Julia, Martín, Ane, Goitandia, Amaia M., Monteserín Vilela, Cristina, Mendibil, Xabier, Vidal García, Karmele, Lambarri, Jon, Aranzabe Basterrechea, Estíbaliz, Blanco Miguel, Miren, Vilas Vilela, José Luis, Química física, Kimika fisikoa, Laza Terroba, José Manuel, Veloso Fernández, Antonio, Sánchez Bodón, Julia, Martín, Ane, Goitandia, Amaia M., Monteserín Vilela, Cristina, Mendibil, Xabier, Vidal García, Karmele, Lambarri, Jon, Aranzabe Basterrechea, Estíbaliz, Blanco Miguel, Miren, and Vilas Vilela, José Luis

Abstract

The present work is a first approach in order to achieve thermo-sensitive and waterproof polyurethane fibers useful in the textile industry. For this, two polyurethane formulations with glass transition temperatures (Tg) close to the body temperature have been synthetized and characterized by several techniques such as Ther-mogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Dynamic-Mechanical Analysis (DMA) and Thermo-mechanical analysis (TMA). In this manner their thermal and shape memory behavior were determined. It was also estimated the water vapor transmission rate of both polyurethane films. Then, integration of two different microencapsulated phase change materials (PCMs), one with organic shell and another one, with an inorganic shell, was carried out by extrusion in order to achieve materials with thermo-regulating properties. Fibers for both polyurethanes, pristine or loaded with microencapsulated PCMs, were again characterized to check that the thermal and shape memory properties are maintained, and to study their capability to storage and release energy. The promising results pave the way for a new generation of thermo-regulating materials useful in numerous applications such as the textile sector.

Published
2022

15. Novel process chain for hot metal gas forming of ferritic stainless steel 1.4509.

Author

Mosel, André, Lambarri, Jon, Degenkolb, Lars, Reuther, Franz, Hinojo, José Luis, Rößiger, Jörg, Eurich, Egbert, Albert, André, Landgrebe, Dirk, Wenzel, Holger, Fratini, Livan, Di Lorenzo, Rosa, Buffa, Gianluca, and Ingarao, Giuseppe

Subjects
*FERRITIC steel, *STEELWORK, *THERMAL expansion, *HYDROFORMING (Metalwork), *ANNEALING of metals
Abstract

Exhaust gas components of automobiles are often produced in ferritic stainless steel 1.4509 due to the low thermal expansion coefficient and the low material price. Until now, components of the stainless steel with complex geometries have been produced in series by means of multi-stage hydroforming at room temperature with intermediate annealing operations. The application of a single-stage hot-forming process, also referred to as hot metal gas forming (HMGF), offers great potential to significantly reduce the production costs of such components. The article describes a novel process chain for the HMGF process. Therefore the tube is heated in two steps. After pre-heating of the semi-finished product outside the press, the tube is heated up to forming start temperature by means of a tool-integrated conductive heating before forming. For the tube of a demonstrator geometry, a simulation model for the conduction heating was set up. In addition to the tool development for this process, experimental results are also described for the production of the demonstrator geometry. [ABSTRACT FROM AUTHOR]

Published
2018
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