NOVOS SOLVENTES VERDES BASEADOS NO CLORETO DE BENZALCÔNIO: SÍNTESE E AVALIAÇÃO DO POTENCIAL PLASTIFICANTE

Abstract

The need for safer and more environmentally sustainable methods, that is to say, they have a more 'green' character, has directed the research in chemistry to the development of alternative methods, both in the academic as in the industrial sector. In this context, Ionic Liquids (LIs) and Deep Eutectic Solvents (DES) have attracted growing interest in "green" organic synthesis, because they are compounds that have several important characteristics, such as low vapor pressure, decreasing and / or avoiding emissions of gases to atmosphere. Another point of great relevance of LIs and DES is the possibility of being used as solvents and / or catalysts both in organic reactions and in other processes as an alternative form. Considering the importance of the development of new alternative and sustainable methodologies, in this work we evaluate and develop a series of new DES based on the combination of benzalkonium chloride and amino acids. Among the products obtained, DES [BA] [Leu] was selected to be evaluated for its potential as a plasticizer in biodegradable starch films of M. esculenta Crantz (better known as cassava). The products were synthesized by means of a very simple reaction, in a single step, a metathesis reaction for product formation, which has 100% atomic efficiency, one of the principles of Green Chemistry. From this procedure the best conditions were obtained to obtain a series of deep eutectic solvents. The characterization was performed by means of Infrared Spectroscopy and Hydrogen Nuclear Magnetic Resonance (1H-NMR). For the formulation of the biofilms, the casting method was used, which consists in heating the mixture to the gelation temperature of the starch and, subsequently, adding the plasticizing agents. The study of the plasticizing action of the obtained compounds was quite satisfactory as it resulted in the formation of the biofilm, showing that the interaction with the polymer chains of the starch occurs. In addition, the biofilms obtained presented relevant characteristics regarding the thickness, transparency and opacity of the materials, demonstrating the importance in the continuity of this research.