Polyurethane/n-Octadecane Phase-Change Microcapsules via Emulsion Interfacial Polymerization: The Effect of Paraffin Loading on Capsule Shell Formation and Latent Heat Storage Properties

Author:

Voronin Denis V.1ORCID,Sitmukhanova Eliza1,Mendgaziev Rais I.1,Rubtsova Maria I.1ORCID,Kopitsyn Dmitry1ORCID,Cherednichenko Kirill A.1ORCID,Semenov Anton P.1ORCID,Fakhrullin Rawil2ORCID,Shchukin Dmitry G.3,Vinokurov Vladimir1

Affiliation:

1. Department of Physical and Colloid Chemistry, National University of Oil and Gas “Gubkin University”, 119991 Moscow, Russia

2. Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, 42000 Kazan, Republic of Tatarstan, Russia

3. Department of Chemistry, Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool L69 7ZD, UK

Abstract

Organic phase-change materials (PCMs) hold promise in developing advanced thermoregulation and responsive energy systems owing to their high latent heat capacity and thermal reliability. However, organic PCMs are prone to leakages in the liquid state and, thus, are hardly applicable in their pristine form. Herein, we encapsulated organic PCM n-Octadecane into polyurethane capsules via polymerization of commercially available polymethylene polyphenylene isocyanate and polyethylene glycol at the interface oil-in-water emulsion and studied how various n-Octadecane feeding affected the shell formation, capsule structure, and latent heat storage properties. The successful shell polymerization and encapsulation of n-Octadecane dissolved in the oil core was verified by confocal microscopy and Fourier-transform infrared spectroscopy. The mean capsule size varied from 9.4 to 16.7 µm while the shell was found to reduce in thickness from 460 to 220 nm as the n-Octadecane feeding increased. Conversely, the latent heat storage capacity increased from 50 to 132 J/g corresponding to the growth in actual n-Octadecane content from 25% to 67% as revealed by differential scanning calorimetry. The actual n-Octadecane content increased non-linearly along with the n-Octadecane feeding and reached a plateau at 66–67% corresponded to 3.44–3.69 core-to-monomer ratio. Finally, the capsules with the reasonable combination of structural and thermal properties were evaluated as a thermoregulating additive to a commercially available paint.

Funder

Ministry of Science and Higher Education of the Russian Federation

RFBR

Kazan Federal University Strategic Academic Leadership Program

Publisher

MDPI AG

Subject

General Materials Science

Reference54 articles.

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