New fluorinated cyclophosphazenes: synthesis, properties, applications

Abstract

The work presents the synthesis and characterization of fluorinated cyclophosphazenes, which are readily soluble in supercritical CO₂ and can be used as textile finishing chemicals in a supercritical CO₂ deposition process. The reaction of hexachlorocyclophosphazene with sodium alcoholate of 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octanol was performed. The reaction product analysis suggested that all parent hexachlorocyclophosphazene molecules participated in the reaction, 4- and 5-substituted fluorinated cyclophosphazene molecules comprised most of the reaction product. Cloud point measurements confirmed that the product is soluble in supercritical CO₂ at moderate conditions. Fluorinated cyclophosphazene coating was deposited from solutions in supercritical CO₂ onto cotton textile. Scanning electron microscopy revealed that the coating is deposited uniformly. The textile after treatment was hydrophobic with an initial contact angle of 106 ± 8 degrees. The obtained fluorinated cyclophosphazenes can be considered as building blocks for the further development of phosphazenes that are soluble in sc CO₂ and can be used as hydrophobic finishing chemicals with improved properties.

Graphical Abstract

Keywords:

• Fluorinated cyclophosphazenes
• supercritical carbon dioxide
• functional coatings

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The study was supported by Russian Science Foundation (RSF), grant no. 21-13-00143. https://rscf.ru/en/project/21-13-00143/. NMR studies, FTIR and elemental analysis were performed with the financial support from Ministry of Science and Higher Education of the Russian Federation using the equipment of Center for molecular composition studies of INEOS RAS.