Use of curcumin and glycerol as an effective photoinitiating system in the polymerization of urethane dimethacrylate

Author(s)

de Oliveira, Deborah Stolte Bezerra Lisboa ; de Oliveira, Luiza Stolte Bezerra Lisboa ; Alarcon, Rafael Turra ; da Cunha Holanda, Bruno Barreto ; Bannach, Gilbert

• Document type: Journal article
• Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 128, n. 3, p. 1671-1682, JUN 2017.
• Web of Science Citations: 3

Abstract

The objectives of this study were to verify the viability of the photoinitiating system using curcumin as a photoinitiator and glycerol as a coinitiator, to analyze the thermal and morphological features of the polymers produced, and finally evaluate the possibility of removing toxic Ethyl-p-dimethylaminobenzoate from the photoinitiating system. Curcumin, an orange-yellow dye extracted from the rhizoids of the plant Curcuma longa, is known to be a common photosensitizer, and the type II photoinitiating system consisting of a dye and an amine is long known to be effective. In recent years, the production of biodiesel has increased, and consequently, so has the generation of its main by-product, glycerol. Thus, it becomes necessary to study ways to incorporate glycerol into products. Using thermoanalytical methods (Thermogravimetry, Differential Thermal Analysis, and Differential Scanning Calorimetry), Middle Infrared Spectroscopy, and Scanning Electronic Microscopy, it was possible to assess the thermal and morphological characteristics of the polymers produced, and compare whether the presence or lack of tertiary amine, as well as the addition of different molar ratios of glycerol, had any significant impact on these characteristics. Results suggested that neither the removal of tertiary amine nor the addition (in different proportions) of glycerol affected the thermal stability of the polymers. Also, removing the tertiary amine enhanced the total conversion degree of the polymers. (AU)

• FAPESP's process: 12/21450-1 - Thermoanalytical studies, synthesis and characterization of the solid co-crystals of ketoprofen with some co-formers
• Grantee: Gilbert Bannach
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/09022-7 - Thermoanalytical studies, synthesis and characterization of the solid co-crystals of antibiotics (fluoroquinolones) with some co-formers
• Grantee: Massao Ionashiro
• Support Opportunities: Regular Research Grants