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Form-Stable Phase Change Materials Based on SEBS and Paraffin: Influence of Molecular Parameters of Styrene-b-(Ethylene-co-Butylene)-b-Styrene on Shape Stability and Retention Behavior

Fraunhofer Institute for Structural Durability and System Reliability LBF, Schlossgartenstr. 6, 64289 Darmstadt, Germany
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Materials 2020, 13(15), 3285; https://doi.org/10.3390/ma13153285
Received: 24 June 2020 / Revised: 8 July 2020 / Accepted: 15 July 2020 / Published: 23 July 2020
(This article belongs to the Special Issue Phase Change Materials for Thermal Energy Storage)
In this work, the influence of molecular parameters of styrene-b-(ethylene-co-butylene)-b-styrene (SEBS) triblock copolymer as matrix material in form-stable phase change material (FSPCM) on the thermo-mechanical properties and leakage behavior are studied. Various SEBS grades differing in their molecular weight, styrene content, and ethylene/butylene ratio are used as supporting matrix in composites with 90 wt.% paraffin. Thermo-mechanical properties are determined by rheological measurements. The results show phase transitions temperatures from solid to hard gel, hard gel to soft gel, and soft gel to gel fluid. Paraffin leakage in FSPCM is analyzed by mass loss over time in an oven at 60 °C. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) are applied to determine the thermal energy storage capacity. Finally, the molecular weight and the styrene content are combined to the molecular weight of styrene block which is identified as the authoritative parameter for the thermo-mechanical properties of the SEBS/PCM composite. View Full-Text
Keywords: phase change material; SEBS; paraffin; form-stable phase change material; phase transition; shape stability mechanism; leakage; thermal energy storage; hexadecane phase change material; SEBS; paraffin; form-stable phase change material; phase transition; shape stability mechanism; leakage; thermal energy storage; hexadecane
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Rickert, R.; Klein, R.; Schönberger, F. Form-Stable Phase Change Materials Based on SEBS and Paraffin: Influence of Molecular Parameters of Styrene-b-(Ethylene-co-Butylene)-b-Styrene on Shape Stability and Retention Behavior. Materials 2020, 13, 3285.

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