Stable Polyurethane Containers through the Assembly of Cellulose Nanocrystals at the Oil Droplet Interface and Crosslinking with Polymeric Isocyanate
Denis V. Voronin1, Adeliya R. Sayfutdinova1, Maria I. Rubtsova1, Dmitry S. Kopitsyn1, Kirill A. Cherednichenko1, Dmitry G. Shchukin2, and Vladimir Vinokurov1
1 National University of Oil and Gas «Gubkin University», Leninsky pr. 65-1, Moscow 119991, Russian Federation
2 Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, United Kingdom
Abstract
In this study, we demonstrate a reliable approach to improve the shape stability of organic phase-change material n-Octadecane by encapsulation via interfacial polymerization at an oil/water interface of Pickering emulsion. Cellulose nanocrystals are employed as emulsion stabilizers and branched oligopolyol with high functionality to crosslink the polyurethane shell in reaction with polyisocyanate dissolved in the oil core. This gives rise to a rigid polyurethane structure with a high density of urethane groups. The formation of a polyurethane shell and successful encapsulation of n-octadecane is confirmed by FTIR spectroscopy, XRD analysis, and fluorescent confocal microscopy. Electron microscopy reveals the formation of non-aggregated capsules with an average size of 18.6 um and a smooth uniform shell with the thickness of 450 nm. The capsules demonstrate a latent heat storage capacity of 79 J/g, while the encapsulation of n-octadecane greatly improves its shape and thermal stability compared with bulk paraffin.
The work was supported by the Ministry of Science and Higher Education of the Russian Federation in the framework of the state task in the field of scientific activity; subject number FSZE-2022-0001.
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Denis Voronin
National University of Oil and Gas «Gubkin University»
Russia
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