Synthesis of luminescent polymers in the UV light region from dimethacrylate monomer using novel quinoline dyes

Abstract

This study aims at thermal and morphological features, as well as the degree of conversion these luminescent polymers obtained using a dimethacrylate monomer, and quinoline dyes as photoinitiator. The photoinitiators provide a fluorescent propriety to the final polymer. Thermal properties such as thermal stability, steps of mass loss, and glass transition are obtained by thermogravimetry‐differential thermal analysis and derivative thermogravimetric and differential scanning calorimetry. Using the mid‐infrared spectroscopy, it is possible to calculate the degree of conversion/rate of polymerization; the data indicate that the quinoline derivatives could be used as photoinitiators in lower concentration (0.1%) resulting in solid rigid polymers with higher conversion (74.24, 71.81, 66.36, and 61.09%). The morphological characteristics of polymers are analyzed by scanning electronic microscopy. Finally, solid ultraviolet–visible (UV–vis) analysis shows a bathochromic shift, due to the stabilization of the molecules in the solid state, compared to liquid UV–vis analysis. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47461.

Effect of metal oxide fillers in urethane dimethacrylate polymer with glycerol obtained by photopolymerization synthesis

“…A drop of the monomeric mixture was placed over the diamond crystal and then irradiated with a light emitting diode (LED, D-2000, DMC Ltd., São Carlos, SP, Brazil) for 400 s. Transmittance (T%) spectra were collected every 10 s, resulting in 40 measurements for each polymer. Transmittance values were used to calculate MC values according to Equation ( 1) [15,16,24,25].…”

“…( 1), it was possible to plot a graph of MC versus time. In addition, the rate of polymerization was calculated via a subtraction process, by calculating differences in MC values between 10 s intervals (for example at t=30 s, rate of polymerization is MC at t=30 s minus the MC value at t=20 s) using a previously reported method in the literature [25].…”

Combined Spectroscopic and TD‐DFT Analysis to Elucidate Substituent and Acidochromic Effects in Organic Dyes: A Case Study on Amino‐ versus Nitro‐Substituted 2,4‐Diphenylquinolines

“…Such case study is undertaken in the present work, investigating a common dye core structure, 2,4-diphenyl-quinoline; see Scheme 1. Quinolines have been widely investigated in drug development and biological science, [25][26] as photoinitiators for fluorescent polymers, [27] pH indicators, food colorants, corrosion inhibitors, etc., [28] as well as in optoelectronics. [29] Introducing amino-and nitro-functionalities as donor and acceptor groups, respectively, the optical and photophysical response can be drastically altered, while keeping the fundamental molecular backbone.…”