The Preparation of Novel Microcapsules Based on Palmitic Acid Core and Waterborne Polyurethane/Silane Shell as Phase Cha
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ORIGINAL PAPER
The Preparation of Novel Microcapsules Based on Palmitic Acid Core and Waterborne Polyurethane/Silane Shell as Phase Change Materials for Thermal Energy Storage Zahra Hoseini1 · Mir Mohammad Alavi Nikje1 Accepted: 3 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this study work, a novel form-stable microcapsule phase change material was synthesized for thermal energy storage based on palmtic acid (PA) as the core and silane modified waterborne polyurethane (WBPU/Si) as the shell. The polymeric shell was prepared by the reaction of polypropylene glycol, 2,2-bis(hydroxymethyl) propionic acid (DMPA) and 1,5-naphthalene diisocyanate (NDI) by incorporation of 3-aminopropyltriethoxysilane (APTS) via in situ polymerization method. In continue, a simple mixing of this aqueous dispersion of polyurethane with dispersion of PA in water using an anionic surfactant as a stabilizer, results in the self-assembly of WBPU onto the PA droplets by an electrostatic interaction, lead to the encapsulation of PA by PU to form a core–shell composite microcapsule. Fourier transform infrared spectroscopy was used to characterize the chemical structure, and the crystalline properties were analyzed by the X-ray diffraction. The morphology and particle distribution in the samples have been reported with scanning electron microscope imaging. Thermal properties of the prepared composites were estimated via thermogravimetric analysis and differential scanning calorimetry. The results show the successful preparation of the smooth and compact surface microcapsules with mean particle size of 200–400 μm which have good thermal storage properties.
* Mir Mohammad Alavi Nikje [email protected] 1
Department of Chemistry, Faculty of Science, Imam Khomeini International University, PO Box 288, Qazvin, Iran
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Vol.:(0123456789)
Journal of Polymers and the Environment
Graphic abstract
Keywords Waterborne polyurethane · Silane · Microencapsulation · Phase change material · Thermal energy storage · Palmitic acid
Introduction During the last few years, extensive research effort has been carried out for the thermal energy storage in order to improve the performance of energy systems and saving of energy fuels. Phase change materials (PCMs) are a group of substances that can store a significant amount of latent heat and then release it while phase transitions occur in a narrow temperature range [1, 2]. Currently, PCMs have been widely used for solar energy storage [3], temperature control for textiles [4], recovering industrial waste heat [5], energy saving in buildings [6], etc. Organic, inorganic, polymeric and eutectic materials have so far been studied as a PCM for thermal energy storage from solar and other heat sources [7–9]. Among organic PCM, fatty acids have been received tremendous attention because of their high phase change latent heat, low vapor pressure, great chemical stability, show no
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phase separation [10, 11]. However in spite of the many attractive features
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