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

Document Type : Research Article


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


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.


Main Subjects

[1] Salaün F., Devaux E., Bourbigot S., Rumeau P., Development of Phase Change Materials in Clothing Part I: Formulation of Microencapsulated Phase Change, Text. Res. J., 80: 195-205 (2010).
[2] Feczkó T., Kardos A., Trif L., Gyenis J., Thermal Energy Storage by Microcomposite of a Phase Change Material and Ethyl Cellulose, WIT Trans. Ecol. Built Environ., 142: 279-290 (2014).
[3] Shin Y., Yoo D.I., Son K., Development of Thermoregulating Textile Materials with Microencapsulated Phase Change Materials (PCM). II. Preparation and Application of PCM Microcapsules, J. Appl. Polym. Sci., 96: 2005-2010 (2005).
[4] Nelson G., Application of Microencapsulation in Textiles, Int. J. Pharm., 242: 55-62 (2002).
[5] Shan X., Wang J., Zhang X., Wang X., Formaldehyde-Free and Thermal Resistant Microcapsules Containing N-Octadecane, Thermochim. Acta., 494: 104-109 (2009).
[6] Mattila H., “Textiles and Fashion: Materials, Design and Technology”, Woodhead Publishing, (2015).
[7] Li X., Song Y., Zhang C., Zhao C., He C., Inverse CO2/C2H2 Separation in a Pillared-Layer Framework Featuring a Chlorine-Modified Channel by Quadrupole-Moment Sieving, Sep. Purif. Technol., 279: 119608 (2021).
[8] Zhang X., Tang Y., Zhang F., Lee C., A Novel Aluminum-Graphite Dual-Ion Battery, Adv. Energy Mater., 6(11): 1502588 (2016).
[9] Feng Y., Zhang B., Liu Y., Niu Z., Dai B., Fan Y., Chen X., A 200-225-GHz Manifold-Coupled Multiplexer Utilizing Metal Wave Guides, IEEE Trans. Microw. Theory Tech., 1: (2021).
[10] Cao H., “Active Coatings for Smart Textiles”, Woodhead Publishing, (2016).
[11] Shahmoradi A., Vakili M.H., Ghahramani P., Effect of SiO2 Nanoparticles on Thermal Properties of Polyaniline/Palmitic Acid Composite as an Energy Storage System, Iran. J. Chem. Chem. Eng (IJCCE)., 41(10): 3304-3313 (2022).
[12] Babapoor A., Haghighi A., Jokar S.M., Ahmadi Mezjin M., The Performance Enhancement of Paraffin as a PCM During the Solidification Process: Utilization of Graphene and Metal Oxide Nanoparticles, Iran. J. Chem. Chem. Eng. (IJCCE), 41(1): 37-48 (2020).
[13] Feczkó T., Kardos A.F., Németh B., Trif L., Gyenis J., Microencapsulation of N-Hexadecane Phase Change Material by Ethyl Cellulose Polymer, Polym. Bull., 71: 3289-3304 (2014).
[14] Yang R., Zhang Y., Wang X., Zhang Y., Zhang Q., Preparation of N-Tetradecane-Containing Microcapsules with Different Shell Materials by Phase Separation Method, Sol. Energy Mater. Sol., 93: 1817-1822 (2009).
[15] Mohammadi Khoshraj B., Seyyed Najafi F., Mohammadi Khoshraj J., Ranjbar H., Microencapsulation of Butyl Palmitate in Polystyrene-Co-Methyl Methacrylate Shell for Thermal Energy Storage Application, Iran. J. Chem. Chem. Eng. (IJCCE), 37(3): 187-194 (2018).
[16] Jamekhorshid A., Sadrameli S., Farid M., A Review of Microencapsulation Methods of Phase Change Materials (PCMs) as a Thermal Energy Storage (TES) Medium, Renew. Sust. Energy Rev., 31: 531-542 (2014).
[17] Li M., Rouaud O., Poncelet D., Microencapsulation by Solvent Evaporation: State of the Art for Process Engineering Approaches, Int. J. Pharm., 363: 26-39 (2008).
[18] Loxley A., Vincent B., Preparation of Poly (Methylmethacrylate) Microcapsules with Liquid Cores, J. Colloid Interface Sci., 208: 49-62 (1998).
[19] Zarei A., Ghaffarian V., Preparation and Characterization of Biodegradable Cellulose Acetate-Starch Membrane, Polym. Plast. Technol. Eng., 52: 387-392 (2013).
[20] Ghaffarian V., Mousavi S.M., Bahreini M., Afifi M., Preparation and Characterization of Biodegradable Blend Membranes of PBS/CA, J. Polym. Environ., 21: 1150-1157 (2013).
[21] Yan Y., Feng L., Shi M., Cui C., Liu Y., Effect of Plasma-Activated Water on the Structure and in Vitro Digestibility of Waxy and Normal Maize Starches During Heat-Moisture Treatment, Food Chem., 306: 125589 (2020).
[22] Shi M., Wang F., Lan P., Zhang Y., Zhang M., Yan Y., Liu Y., Effect of Ultrasonic Intensity on Structure and Properties of Wheat Starch-Monoglyceride Complex and its Influence on Quality of Norther-Style Chinese Steamed Bread, LWT-Food Sci. Technol., 138: 110677 (2021).
[23] Puls J., Wilson S.A., Hölter D., Degradation of Cellulose Acetate-based Materials: A Review, J. Polym. Environ., 19: 152-165 (2011).
[24] Qiu X., Li W., Song G., Chu X., Tang G., Fabrication and Characterization of Microencapsulated n-Octadecane with Different Crosslinked Methylmethacrylate-based Polymer Shells, Sol. Energy Mater. Sol., 98: 283-293 (2012).
[25] Chananipoor A., Azizi Z., Raei B., Tahmasebi N., Synthesis and Optimization of GO/PMMA/n-Octadecane Phase Change Nanocapsules Using Response Surface Methodology, Iran. J. Chem. Chem. Eng.(IJCCE), 40(2): 383-394 (2021).
[26] Tasker A.L., Hitchcock J.P., He L., Baxter E.A., Biggs S., Cayre O.J., The Effect of Surfactant Chain Length on the Morphology of Poly (Methyl Methacrylate) Microcapsules for Fragrance Oil Encapsulation, J. Colloid Interface Sci., 484: 10-16 (2016).
[27] Zhang Z., Feng S.-S., The Drug Encapsulation Efficiency, in Vitro Drug Release, Cellular Uptake and Cytotoxicity of Paclitaxel-Loaded Poly (Lactide)–Tocopheryl Polyethylene Glycol Succinate Nanoparticles, Biomaterials, 27: 4025-4033 (2006).
[28] Sear R.P., Heterogeneous Nucleation Near Metastable First-Order Bulk and Surface Phase Transitions, Langmuir, 18: 7571-7576 (2002).
[29] Yang Y.-Y., Chung T.-S., Bai X.-L., Chan W.-K., Effect of Preparation Conditions on Morphology and Release Profiles of Biodegradable Polymeric Microspheres Containing Protein Fabricated by Double-Emulsion Method, Chem. Eng. Sci., 55: 2223-2236 (2000).
[30] Gaikwad S.G., Pandit A.B., Ultrasound Emulsification: Effect of Ultrasonic and Physicochemical Properties on Dispersed Phase Volume and Droplet Size, Ultrason. Sonochem., 15: 554–563 (2008).
[31] Abismaıl B., Canselier J.P., Wilhelm A.M., Delmas H., Gourdon C., Emulsification by Ultrasound: Drop Size Distribution and Stability, Ultrason. Sonochem., 6: 75-83 (1999).
[32] Freitas S., Merkle H.P., Gander B., Microencapsulation by Solvent Extraction/Evaporation: Reviewing the State of the Art of Microsphere Preparation Process Technology, J. Control. Release., 102: 313-332 (2005).
[33] Ghaderi S., Ghanbarzadeh S., Hamishehkar H., Evaluation of Different Methods for Preparing Nanoparticle Containing Gammaoryzanol for Potential use in Food Fortification, Pharm. Sci., 20: 130 (2015).
[34] Fan Y., Zhang X., Wu S., Wang X., Thermal Stability and Permeability of Microencapsulated N-Octadecane and Cyclohexane, Thermochim. Acta., 429: 25-29 (2005).
[35] Fang Y., Kuang S., Gao X., Zhang Z., Preparation and Characterization of Novel Nanoencapsulated Phase Change Materials, Energy Convers. Manag., 49: 3704-3707 (2008).
[36] You M., Zhang X., Wang J., Wang X., Polyurethane foam Containing Microencapsulated Phase-Change Materials with Styrene–Divinybenzene Co-Polymer Shells, J. Mater. Sci., 44: 3141-3147 (2009).