Synthesis, thermal studies and conversion degree of dimethacrylate polymers using new non-toxic coinitiators

Alarcon, Rafael Turra; Holanda, Bruno Barreto da Cunha; Rinaldo, Daniel; Caires, Flávio Júnior; Almeida, Marcos Vinícius de; Bannach, Gilbert

doi:10.21577/0100-4042.20170024

Cited by 5 publications

(25 citation statements)

References 26 publications

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“…The mixtures were photopolymerized over the diamond crystal and data were collected every 10 s for 470 s. The degree of conversion can be calculated using eq. :

DC (() %) = ([], 1 - \frac{T_{t = x} ((), normalC = normalC)}{T_{t = 0} ((), normalC = normalC)}) \times ((), - 1000)

…”

Section: Methodsmentioning

confidence: 99%

“…Hence, a large quantity of materials has been applied in several areas such as biomaterials/dental adhesives, waterproofing/coatings, and optical materials . One of the most used monomer used in photopolymerization is urethane dimethacrylate (UDMA), which has a high applicability, solvent resistance, waterproofing characteristics, and good mechanical/thermal proprieties . Photopolymerization is initiated by a photoinitiator, which generates reactive forms by light that attacks the alkene of acrylate or methacrylate group in the monomer structure.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most used system for photopolymerization is Type II, which use two components: a photoinitiator (fluorophore compound) and a tertiary amine or polyalcohol compound. The mechanism is a hydrogen transfer process that generates the radical . Currently, a large quantity of organic molecules has been used as photoinitiator .…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism is a hydrogen transfer process that generates the radical . Currently, a large quantity of organic molecules has been used as photoinitiator . However, the development of new photoinitiators is essential for use principally in visible light, considering that ultraviolet (UV) light is more hazardous and less efficient than visible (vis) light …”

Section: Introductionmentioning

confidence: 99%

“…Simultaneous thermogravimetry‐differential thermal analysis (TG‐DTA) and differential scanning calorimetry (DSC) are widely used to study thermal properties such as thermal polymerization, glass transition, thermal stability, and degradation steps . Mid‐infrared spectroscopy (MIR) has been used to indicate the degree of conversion and rate of polymerization in the photopolymerization process when using different photoinitiators . The morphological characteristics of polymers are widely analyzed by scanning electron microscope (SEM), and solid UV–vis analysis is used to determine optical band gap and modifications in absorption bands …”

Section: Introductionmentioning

confidence: 99%

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

Alarcon

Santos

Oliveira

et al. 2019

J of Applied Polymer Sci

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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.

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“…The mixtures were photopolymerized over the diamond crystal and data were collected every 10 s for 470 s. The degree of conversion can be calculated using eq. :

DC (() %) = ([], 1 - \frac{T_{t = x} ((), normalC = normalC)}{T_{t = 0} ((), normalC = normalC)}) \times ((), - 1000)

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Alarcon

Santos

Oliveira

et al. 2019

J of Applied Polymer Sci

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

et al. 2020

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Urethane dimethacrylate (UDMA) is a monomer widely used in photopolymerization reactions to produce biomaterials, due to its advantageous properties such as mechanical resistance and relatively low viscosity.However, this monomer is expensive. Reducing the quantity of UDMA monomer required to obtain the final polymer, without losing its main properties, is essential not just in terms of costs but also green chemistry principles. It has been demonstrated that glycerol inclusion into the polymeric matrix during polymerization is one way to achieve this goal. Thus, this work proposes the insertion of glycerol and metal oxide fillers (Al2O3, TiO2, Nb2O5, La2O3 and ZrO2) in the photopolymerization of urethane dimethacrylate, with the aim to study how these effects the degree of conversion, as well as the thermal properties of the final polymer. The thermal properties were evaluated using simultaneous thermogravimetry-differential thermal analysis (TG-DTA) and differential scanning calorimetry (DSC). The degree of conversion/rate of polymerization was calculated using mid-infrared spectroscopy (MIR). The polymers filled with Al2O3, TiO2, Nb2O5 and La2O3 exhibited good conversion values of 87.42, 78.47, 77.64 and 75.51%, respectively. For all polymers synthesized, no significant changes were observed in their thermal stability. Lastly, it is suggested that the incorporation of the oxides in the monomeric mixture correlate to the degree of conversion, with scanning electronic microscopy (SEM) analysis suggesting oxide dispersion interferes with the morphology of the polymer.

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Use of DSC in degree of conversion of dimethacrylate polymers: easier and faster than MIR technique

Alarcon

Gaglieri

Oliveira

et al. 2018

J Therm Anal Calorim

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This work aims to determine the degree of conversion of polymers obtained using diurethane dimethacrylate (UDMA) monomer by two different techniques: differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (MIR). The measurements were made in triplicate on both equipment, which resulted in average values for MIR 79.52 ± 3.57% (camphorquinone photoinitiator) and 78.15 ± 1.86% (fluorescein photoinitiator) and for DSC 80.85 ± 1.06 and 78.27 ± 1.71%. The DSC technique showed higher accuracy and lesser standard deviation. Furthermore, this technique is easier and faster than the MIR, and in situ polymerization is not necessary on the DSC equipment.

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Synthesis, thermal studies and conversion degree of dimethacrylate polymers using new non-toxic coinitiators

Cited by 5 publications

References 26 publications

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

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

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

Use of DSC in degree of conversion of dimethacrylate polymers: easier and faster than MIR technique

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