Síntese e caracterização de polímero conjugado de norbixina com hidroquinona tetraformilada

Abstract

Materials derived from the petrochemical industry have served as a basis for years for the production of consumer goods of society, however, the discovery of the envi-ronmental impacts caused by the use of these products have boosted the search for alternatives Sustainable. Thus, natural polymers also known as biopolymers which originate from natural resources are presented as an alternative for the production of biodegradable materials. This work aims to synthesize and characterize a biopolymer conjugated using as monomers the norbixin extracted from the Urucum (Bixa Orella-na L.) and Hydroquinone Tetraformilada. The polymer synthesis was performed by mixing equimolar amounts of monomers in appropriate solvent and maintained in reflux for a period of 24h. After the polymerization process was Finished the mixture was left at rest until it reached the ambient temperature, the same was filtered and washed to remove excess solvent and dry in greenhouse. All necessary preparation of the polymeric material Was performed to study its structural and thermal properties through the characterization techniques: Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Differential scanning Calorimetry (DSC), UV-Vis Absorption Spectroscopy, Melting Point and fluorescence measurements. The analysis of structural composition of FTIR Spectroscopy showed the emergence of typical carbonyl bands present in coumarin rings (1336.58 cm-1) and reduction of the absorption intensity of the O-H stretches, which makes it noticeable a decrease in the character of hydroxyl groups, eliminated in the policondensation reaction. The Thermal Characterization curves (TGA and DSC) showed that the synthesized mate-rial presented values of phase transitions typical of polymeric materials, especially amorphous polymers. A discrete vitreous transition temperature can be observed in the polymer (126 º C) and that the material is degraded without any melting event. The fluorescence assays showed good results in comparison to the polymers of this nature, but a more thorough study of this property will be necessary. The results ob-tained in the analysis were satisfactory, evidencing that there was the formation of a new polymeric structure, with well-defined characteristics and distinct from the mon-omers formers, guaranteeing consistency and reproducibility of synthesis method.