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Publicação
Sustainable thermochromic cellulose acetate films incorporating [NiCl₄]2−-based ionic liquids
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Resumo(s)
The demand for environmentally friendly smart materials with temperature-responsive properties has led to an increasing interest in ionic liquid (IL)-based thermochromic systems for applications in areas including sensors, process and quality control or smart packaging. This work explores the thermochromic behaviour of cellulose acetate (CA) composites incorporating ionic liquids (ILs) based on different cations, namely [C₄mim]+, [C₆mim]+, [C₈mim]+, [C₄C₁Pip]+, [C₄C₁Pyrr]+, and [C₄Py]+, while sharing the same anion [NiCl4]2−. While the thermochromic behaviour of IL/polymer systems has been reported, a systematic study and understanding of the influence of IL cation structure on morphology, thermal characteristics and functional thermochromic response, remains lacking. This gap is addressed by evaluating the structural and functional properties of the CA/IL composites and chromaticity analysis. Results reveal that the alkyl chain length and ring type of the IL cation significantly influence IL dispersion, film morphology, and thermochromic intensity. Imidazolium-based ILs, particularly those with longer alkyl chain, exhibit the most pronounced and uniform blue colour change at 50 °C, while pyridinium-based systems show the weakest response. The results provide a deeper understanding of how thermochromic IL structures influence composite functional response, supporting the advancement of printable, sustainable, customizable materials for temperature monitoring.
Descrição
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Palavras-chave
Cellulose acetate Temperature responsive films Tetrachloronickelate-based ILs Thermochromic materials Renewable Energy, Sustainability and the Environment General Materials Science Waste Management and Disposal Industrial and Manufacturing Engineering SDG 7 - Affordable and Clean Energy