New fluorescein dye derivatives and their use as an efficient photoiniator using blue light LED

Author(s)

Alarcon, Rafael Turra ; Gaglieri, Caroline ; Sacoman Torquato da Silva, Bruno Henrique ; da Silva Filho, Luiz Carlos ; Bannach, Gilbert

• Document type: Journal article
• Source: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 343, p. 112-118, JUN 15 2017.
• Web of Science Citations: 6

Abstract

This work investigates the degree of conversion, thermal properties, and morphological features of polymers obtained using UDMA monomer and fluorescein and its derivatives dyes as photoinitiator. Photopolymerization has opened new research and material due to its synthesis ability as well as ecological and economic advantages. Fluorescein is a dye with great fluorescent properties; therefore, it could be used as initiator in photopolymerization, including its derivatives. Simultaneous Termogravimetry-Differential Thermal Analysis and Derivative Thermogravimetric (TG/DTG-DTA), Differential Scanning Calorimetry (DSC), Middle Infrared Spectroscopy (MIR), and Scanning Electronic Microscopy (SEM) were used to determine thermal properties, degree of conversion, and morphological characteristics of polymers obtained. The data show that the use of fluorescein and its derivatives as photoinitiators did not change the thermal stability of the polymer (193.13 +/- 7.9 degrees C); however, the chlorinated dyes produced a better degree of conversion (78.73% to F-2 and 69.36% to F-5) than brominated dyes (21.18% to F-3 and 1.21% to F-6), resulting in solid rigid polymers. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 14/01337-1 - Studies about the use of Niobium pentachloride, as Lewis acid, in Friedel Crafts acylation reactions, aiming the synthesis of compounds with potential application as sensitized dyes in organic eletronic devices.
• Grantee: Bruno Henrique Sacoman Torquato da Silva
• Support type: Scholarships in Brazil - Doctorate
• 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 type: Regular Research Grants
• FAPESP's process: 16/01599-1 - Studies about the use of NbCl5 in multicomponent reactions for the synthesis of organic dyes
• Grantee: Luiz Carlos da Silva Filho
• Support type: 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 type: Regular Research Grants