Preparation and Characterization of Microencapsulated Phase Change Materials for Use in Building Applications

Materials

Jessica Giro-Paloma²  Refat Al-Shannaq¹  Ana Inés Fernández²  Mohammed M. Farid¹ 

[1] Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, 20 Symonds Street, Auckland 1142, New Zealand;Department of Materials Science and Metallurgical Engineering, Faculty of Chemistry, Universitat de Barcelona, C/Martí i Franquès, Barcelona 1. 08028, Spain;

关键词: microencapsulated phase change material;    volatile organic compounds;    nano-indentation;    differential scanning calorimetry;   

DOI  :  10.3390/ma9010011

来源: mdpi

【 摘 要 】

A method for preparing and characterizing microencapsulated phase change materials (MPCM) was developed. A comparison with a commercial MPCM is also presented. Both MPCM contained paraffin wax as PCM with acrylic shell. The melting temperature of the PCM was around 21 °C, suitable for building applications. The M-2 (our laboratory made sample) and Micronal^® DS 5008 X (BASF) samples were characterized using SEM, DSC, nano-indentation technique, and Gas Chromatography/Mass spectrometry (GC-MS). Both samples presented a 6 μm average size and a spherical shape. Thermal energy storage (TES) capacities were 111.73 J·g⁻¹ and 99.3 J·g⁻¹ for M-2 and Micronal^® DS 5008 X, respectively. Mechanical characterization of the samples was performed by nano-indentation technique in order to determine the elastic modulus (E), load at maximum displacement (P_m), and displacement at maximum load (h_m), concluding that M-2 presented slightly better mechanical properties. Finally, an important parameter for considering use in buildings is the release of volatile organic compounds (VOC’s). This characteristic was studied at 65 °C by CG-MS. Both samples showed VOC’s emission after 10 min of heating, however peaks intensity of VOC’s generated from M-2 microcapsules showed a lower concentration than Micronal^® DS 5008 X.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.