Thermal analysis

Wendlandt, W.W.

doi:10.1021/ac00296a001

Cited by 60 publications

(12 citation statements)

References 97 publications

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“…The FT‐IR results of partially degraded poly(HNPPMA) showed that were the important changes in carbonyl bands at 1801 and 1765 cm −1 after heating the polymer to 420 °C. Anhydride ring structures have been also found in many cases in the degradation of many homo‐ and co‐polymethacrylate esters . Many polymethacrylates, polystyrenes and their derivatives undergoes scission to radicals which depropagate to monomer, if they do not bear a strained ring or an easily breaking group in their side chain .…”

Section: Resultsmentioning

confidence: 99%

A methacrylate monomer bearing nitro, aryl, and hydroxyl side groups: Homopolymerization, characterization, dielectric, and thermal degradation behaviors

Biryan

Demirelli

2016

J of Applied Polymer Sci

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2-Hydroxy-3-(4-nitrophenoxy)propyl methacrylate (HNPPMA) monomer was synthesized. The poly(HNPPMA) was prepared by free radical polymerization (FRP) method. The characterization of poly(HNPPMA) was carried out using FT-IR, NMR, differential scanning calorimetry, and GPC techniques. The thermal stability and degradation behavior of this polymer have been studied by using thermogravimetry (TG), GC-MS, NMR, and FT-IR. The results were in comparison to poly[2-hydroxy-3-(1-naphtyloxy)propyl methacrylate] sample with a-naphtyloxy side group prepared by the same method in the our previous study. The effect of thermal activation on non-isothermal decomposition kinetics of poly(HNPPMA) was investigated using thermogravimetric analysis according to Flynn-Wall-Ozawa method. The dielectric measurements of poly(HNPPMA) and doped with europium(III)chloride (EuCI 3 ) were investigated by impedance analyzer technique in range of 10-4000 Hz frequency by depending on the alternating current conductivities. The mode of thermal degradation including formation of the main products of poly(HNPPMA) degraded from ambient temperature to 500 8C was identified. S8, the cold ring fraction (CRF) was collected from room temperature to 500 8C. The structure of the degradation products has also been studied depending on the GC-MS analysis. The thermal degradation mechanism for poly(HNPPMA) with radical degradation processes thought to dominate at high temperature was proposed based on GC/MS, NMR, FT-IR, and taking into account the new products and differences in stability. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43925.

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Section: Resultsmentioning

confidence: 99%

A methacrylate monomer bearing nitro, aryl, and hydroxyl side groups: Homopolymerization, characterization, dielectric, and thermal degradation behaviors

Biryan

Demirelli

2016

J of Applied Polymer Sci

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“…9b). These differences are probably due to different experimental conditions that affect the thermoanalytical results, as discussed in the classical books as the one from Wendlandt [11]. Fig.…”

Section: Inorganic Residue Characterizationmentioning

confidence: 98%

Revisiting the thermal behavior of dipyrone

Medeiros

Ferreira

Cavalheiro

2021

J Therm Anal Calorim

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Although some thermoanalytical studies regarding thermal analysis of dipyrone sodium monohydrate had already been presented in literature, results are incomplete once no evolved gas analysis has been presented. In addition, the inorganic residue should also be better characterized regarding the presence of sodium sulfate or sodium hydrogen sulfite, once the amount of residue varies depending on experimental conditions. In this work, the thermal degradation of dipyrone sodium monohydrate was revisited regarding evolved gases, intermediates produced during heating and inorganic residue. Thus, dipyrone sodium monohydrate was analyzed using TG/DTG/DTA, DSC, hot-stage microscopy, TG-FTIR and HPLC-MS looking for proposing a thermal behavior mechanism for this important pharmaceutical. Moreover, inorganic residue was investigated by XRD and FTIR. The evolved gases were detected and identified in the following sequence: water, sulfur dioxide, methylamine, isocyanic acid, benzene, ammonia and carbon dioxide. Regarding the inorganic fraction, intermediates were collected at 500 and 1000 °C and characterized as Na 2 SO 4 in dry air atmosphere. From these data obtained by combining results from thermoanalytical techniques with those from HPLC-MS, FTIR and XRD, a mechanism for the thermal behavior of dipyrone sodium monohydrate was proposed.

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“…TG analizinden elde edilen kütle kaybı eğrilerinin şekilleri kullanılarak bozunma kinetiği hakkında birçok bilgi elde edilebilir. Bozulmuş maddenin ara ve son ürünlerinin termal kararlılığı ve bozunma bileşimi hakkında bazı fizikokimyasal veriler elde etmek mümkündür (Doyle, 1961;Coats ve Redfen, 1964;Wendlandt, 1986). Özellikle, termogravimetrik analiz (TG), farklı ısıtma oranlarında az miktarda numune ile polimerinin bozunma kinetiğini incelemek için en faydalı analiz olarak kabul edilmiştir (Gupta ve Mondal, 2019).…”

Section: Introductionunclassified

Kalkon Grubu Taşıyan Yeni Akrilamit Polimerinin Hazırlanması, Kinetik ve Dielektrik Özelliklerinin İncelenmesi

Çalışkan

Biryan

Koran

2021

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada ilk olarak kalkon grubu içeren yeni bir akrilamit monomeri sentezlendi. Daha sonra serbest radikalik polimermerizasyon yöntemine göre dikümil peroksit başlatıcı varlığında homopolimeri hazırlandı. Elde edilen polimerin termal özelliklerini incelemek ve bozunma aktivasyon enerjinin belirlenebilmesi için farklı ısıtma hızlarında TGA ölçümleri alındı. Tek basamaklı bozunma gösteren polimerin Flynn-Wall-Ozawa yöntemine göre ortalama aktivasyon enerjisi hesaplandı. Karşılaştırmalı TGA eğrilerinden 0.02-0.5 dönüşüm aralığında Flynn-Wall-Ozawa eğrileri oluşturuldu ve ortalama aktivasyon enerjisi 127.03 kJ mol -1 olarak belirlendi. Polimerin dielektrik özellikleri 1-200 kHz frekans aralığında faklı sıcaklıklarda empedans analizör ile incelendi. Oda sıcaklığında polimerin 1 kHz'deki dielektrik sabiti değeri 7.51 iken daha yüksek frekanslara çıkıldıkça bu değer azalmaktadır. 200 kHz değerinde polimerin dielektrik sabiti 7.33 olarak kaydedilmiştir. 10 kHz sabit frekansta oda sıcaklığında 7.44 olarak hesaplanan dielektrik sabiti sıcaklığın artmasıyla birlikte artış göstermiş, 50 o C' 10.48 ve 60 o C için 14.06 olarak hesaplanmıştır.

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Thermal analysis

Cited by 60 publications

References 97 publications

A methacrylate monomer bearing nitro, aryl, and hydroxyl side groups: Homopolymerization, characterization, dielectric, and thermal degradation behaviors

A methacrylate monomer bearing nitro, aryl, and hydroxyl side groups: Homopolymerization, characterization, dielectric, and thermal degradation behaviors

Revisiting the thermal behavior of dipyrone

Kalkon Grubu Taşıyan Yeni Akrilamit Polimerinin Hazırlanması, Kinetik ve Dielektrik Özelliklerinin İncelenmesi

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