Preparation and Characterization of Cellulose Acetate Microencapsulated N-Octadecane for Thermal Regulation Applications

Document Type : Research Article

Authors

1 Department of Physics and Chemistry, Faculty of Basic Science, Imam Ali University, Tehran, I.R. IRAN

2 Department of Civil Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, I.R. IRAN

3 Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, I.R. IRAN

Abstract

In this research, a systematic study was carried out to prepare microcapsules with cellulose acetate as a shell polymer and n-octadecane as a core material with a phase separation technique. This study aimed to investigate and clarify conditions for optimal morphology and behavior of these microcapsules for Phase Change Materials (PCMs). The optimal core-shell weight ratio, polymer molecular weight, and emulsification method were investigated. Using cellulose acetate with higher molecular weight (52,000 g/mol) and a core-to-shell weight ratio of 2:1, microcapsules with a high encapsulation efficiency of 86.7%, melting and crystallization enthalpies of 132.33 (J/g) and 91.24 (J/g) were obtained. It was also observed that the optimal method for preparation of the primary emulsion phase was via magnetic stirring in comparison with ultra-sonication (40.9%). The average particle size distribution of microcapsules was 20.48 μm, with an average shell thickness of 0.777 μm. The method used in this study was simple, fast, and low cost-effective. With an easy-to-scale-up feature, and not requiring high temperatures or phase change starters, these novel microencapsulated PCMs are ideal for industrial use.

Keywords

Main Subjects

References

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Iranian Journal of Chemistry and Chemical Engineering
Volume 41, Issue 12 - Serial Number 122
December 2022
Pages 3989-3999

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