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In situ Shape-Stabilization of n-Octadecane PCM in Alginate Matrix through Formation of Emulsion and Solidification by Ionic Crosslinking

In situ Shape-Stabilization of n-Octadecane PCM in Alginate Matrix through Formation of Emulsion... A novel in situ shape-stabilization process of paraffinic phase change material (PCM) in alginate matrix was investigated for the purpose of temperature regulating application. n-Octadecane was selected as a paraffinic PCM because of its adequate thermal transition temperature for applying to human body. As the size control of n-octadecane in polymer matrix less than 10 µm is a core factor for textile application, oil-in-water (O/W) emulsion of n-octadecane in water were adopted for the size control in shape-stabilization of PCM (SSPCM) in polymer matrix. The micelle size of the PCM emulsion could be controlled in the range of 3–8 µm through O/W emulsion process with high-speed stirring at 3,000–7,000 rpm and small amount of surfactant. The size of micelles in the emulsion decreased with increasing of homogenizing speed and the amount of surfactant. It was also confirmed that the PCM micelle size was maintained in alginate-PCM hybrid solution that was prepared by mixing the O/W emulsion and aqueous sodium alginate solution. The SSPCM films containing 10–30 wt% of n-octadecane in alginate could be successfully prepared by casting the hybrid solution followed by coagulating the cast film in aq. CaCl2 resulting solidification and insolubilization of alginate through intermolecular ionic crosslinking by Ca2+. It was interesting that the shape of n-octadecane in alginate matrix was not spherical but disk shape parallel to the film surface. It was presumed that the discus-type shape-stabilized form of n-octadecane in alginate matrix was originated by vertical compressive force applied during rapid coagulation of the hybrid solution having very low concentration of sodium alginate (4 wt%). The shape of paraffinic PCM stabilized in polymer matrix through O/W emulsion is expected to be controlled when the other polymeric system with thick concentration. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fibers and Polymers Springer Journals

In situ Shape-Stabilization of n-Octadecane PCM in Alginate Matrix through Formation of Emulsion and Solidification by Ionic Crosslinking

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Publisher
Springer Journals
Copyright
Copyright © The Korean Fiber Society for Fibers and Polymers and Springer 2022
ISSN
1229-9197
eISSN
1875-0052
DOI
10.1007/s12221-022-4276-z
Publisher site
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Abstract

A novel in situ shape-stabilization process of paraffinic phase change material (PCM) in alginate matrix was investigated for the purpose of temperature regulating application. n-Octadecane was selected as a paraffinic PCM because of its adequate thermal transition temperature for applying to human body. As the size control of n-octadecane in polymer matrix less than 10 µm is a core factor for textile application, oil-in-water (O/W) emulsion of n-octadecane in water were adopted for the size control in shape-stabilization of PCM (SSPCM) in polymer matrix. The micelle size of the PCM emulsion could be controlled in the range of 3–8 µm through O/W emulsion process with high-speed stirring at 3,000–7,000 rpm and small amount of surfactant. The size of micelles in the emulsion decreased with increasing of homogenizing speed and the amount of surfactant. It was also confirmed that the PCM micelle size was maintained in alginate-PCM hybrid solution that was prepared by mixing the O/W emulsion and aqueous sodium alginate solution. The SSPCM films containing 10–30 wt% of n-octadecane in alginate could be successfully prepared by casting the hybrid solution followed by coagulating the cast film in aq. CaCl2 resulting solidification and insolubilization of alginate through intermolecular ionic crosslinking by Ca2+. It was interesting that the shape of n-octadecane in alginate matrix was not spherical but disk shape parallel to the film surface. It was presumed that the discus-type shape-stabilized form of n-octadecane in alginate matrix was originated by vertical compressive force applied during rapid coagulation of the hybrid solution having very low concentration of sodium alginate (4 wt%). The shape of paraffinic PCM stabilized in polymer matrix through O/W emulsion is expected to be controlled when the other polymeric system with thick concentration.

Journal

Fibers and Polymers – Springer Journals

Published: Sep 1, 2022

Keywords: Alginate; Phase change materials; n-octadecane; Shape-stabilization; O/W emulsion

References