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

Alarcon, Rafael Turra; Gaglieri, Caroline; Oliveira, Arthur Rossi de; Bannach, Gilbert

doi:10.1007/s10973-018-6988-2

Cited by 12 publications

(7 citation statements)

References 27 publications

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“…Data were collected every 10 s, and 40 measurements were made for all samples. Equation (1) was used to quantify the degree of conversion for each sample [19,20,27,28].…”

Section: Middle Infrared Spectroscopy (Mir)mentioning

confidence: 99%

Dimethacrylate polymers with different glycerol content

Alarcon

Gaglieri

Bannach

2018

J Therm Anal Calorim

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The objectives of this study were to verify thermal properties, degree of conversion, and morphological features of several dimethacrylate polymers with different glycerol content and obtain the better proportion system to decrease cost of final polymer. These polymers were synthesized by photopolymerization, which has economic and ecological advantages. The glycerol can be used as a coinitiator in photopolymerization and has the advantage of being inexpensive and non-toxic; thus, it is in the scope of the green chemistry principles. Simultaneous thermogravimetry-differential thermal analysis and derivative thermogravimetric, differential scanning calorimetry, middle infrared spectroscopy, and scanning electronic microscopy were used to determine thermal properties, degree of conversion, and morphological characteristics of polymers obtained. The thermoanalytical results showed that glycerol addition in the dimethacrylate system caused few modifications in the thermal stability of the polymer and thermal events when compared with pure polymers (without glycerol). Two dimethacrylate systems (UDMA/glycerol and Bis-GMA/glycerol) showed good results for conversion degree and morphological aspects when compared with pure systems.

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“…Data were collected every 10 s, and 40 measurements were made for all samples. Equation (1) was used to quantify the degree of conversion for each sample [19,20,27,28].…”

Section: Middle Infrared Spectroscopy (Mir)mentioning

confidence: 99%

Dimethacrylate polymers with different glycerol content

Alarcon

Gaglieri

Bannach

2018

J Therm Anal Calorim

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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%

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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“…∆H of the fabric changed from 60.36 J/g to 56.80 J/g after oligomer extraction. Since ∆H 0 (the melting enthalpy of crystalline polyester) was 140 J/g [27], the crystallinity of the fabric could be changed from 43.11% to 40.57% [28]. This may also have been due to the removal of oligomers from the amorphous region, which affects the overall melting process [29].…”

Section: Dsc Analysismentioning

confidence: 99%

Extraction of Cyclic Oligomer and Their Influence on Polyester Dyeing in a Silicone Waterless Dyeing System

Pei

Zhang

et al. 2021

Polymers

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As a promising new dyeing process without using water, the non-aqueous medium dyeing of polyester has attracted people’s attention and some progress has been made in related research. However, the oligomers of polyester fiber can affect the dyeing of polyester during the use of a silicone waterless dyeing system. Based on this point, the oligomer problem in the silicone waterless dyeing system was investigated. The oligomers of some different types of polyester were extracted by solvent extraction. A treatment method with little influence on the fiber was used to reduce the oligomer content in polyester. The improvement of the dyeing effect of polyester after treatment in silicone medium was studied, and the influence of the oligomer on polyester dyeing was also analyzed. For the dyeing of disperse blue 366, the dye exhaustion was increased by 3.25–3.71%, and the color depth of the dyed sample was increased by 6–13%. Moreover, the colorfastness to rubbing was also improved. In the comparison, the changes in thermal properties and crystallization properties of polyester were tested by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and X-ray diffraction analysis (XRD). The results showed that the thermal and crystalline properties of polyester fiber were not changed before and after solvent extraction.

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

Cited by 12 publications

References 27 publications

Dimethacrylate polymers with different glycerol content

Dimethacrylate polymers with different glycerol content

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

Extraction of Cyclic Oligomer and Their Influence on Polyester Dyeing in a Silicone Waterless Dyeing System

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