Synthesis and Characterization of Acetone-Terephthalaldehyde Polymer and its Oligomers

Kaul, Surandar N.; Fernandez, Jack E.

doi:10.1080/00222339108054410

Cited by 2 publications

(2 citation statements)

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“…After 14 h reaction, significant amounts of insoluble solid particles were still present. The poor efficiency of hydrolysis of 8 F mol −1 products is explained by the low solubility of terephthalaldehyde, 52 which covers the surface of 4Br particles and inhibits further reactions. More rigorous conditions or different solvents are possible solutions for this, though further 8 F mol −1 investigations are beyond the scope of this study, given the desirable methyl group activation at 4.5 F mol −1 .…”

Section: Resultsmentioning

confidence: 99%

A Benign Synthesis Route to Terephthalic Acid via Two-Step Electrochemical Oxidation of P-xylene

Ding,

Orazov,

Oliveira

et al. 2024

J. Electrochem. Soc.

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Terephthalic acid is conventionally synthesized through the AMOCO process under harsh conditions, making milder electrosynthesis routes desirable. Electrooxidation of p-xylene has been demonstrated but the degree of oxidation is limited, resulting in low terephthalic acid yields. Here, we demonstrate a process with two electrochemical steps enabling the complete oxidation of p-xylene into terephthalic acid. The first electrochemical step achieves C-H activation of p-xylene using electrochemically generated bromine as a mediator, while the second electrochemical step does alcohol oxidation of 1,4-benzenedimethanol into terephthalate on NiOOH. The divided cell in the first step simultaneously generates acid and base that are utilized subsequently, negating the need of external acid and base addition and thus offering a cost competitive synthesis route. The competing bromide oxidation in the second step is suppressed by using constant voltage electrolysis at 0.50 V, where an optimal yield of terephthalic acid of 81% is achieved.

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Section: Resultsmentioning

confidence: 99%

A Benign Synthesis Route to Terephthalic Acid via Two-Step Electrochemical Oxidation of P-xylene

Ding,

Orazov,

Oliveira

et al. 2024

J. Electrochem. Soc.

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“…7 An earlier known polymer of terephthaldehyde is TA, which was first synthesized back in 1885 by Loew, 8 whose structural features, on the basis of oligomers synthesized, were studied by Kaul and Fernandez. 9 The latter study revealed the mechanism of polymer synthesis from the oligomers, whose structures were supported by the spectroscopic techniques. However, there was no study regarding the properties and behavior of the TA polymers and its possible applications.…”

Section: Introductionmentioning

confidence: 81%

Optical and thermal studies of modified terephthaldehyde–acetone polymer

Mazhar

Ahmad

Akhtar

2019

Polymers and Polymer Composites

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Terephthaldehyde–acetone polymer was synthesized in an attempt to study its different structural and spectroscopic aspects along with thermal stability. The effect of modification was studied by introducing 4,5-dihydro-1 H-pyrazole ring in the polymer chain and silver nano particles (Ag NPs). The structural features of the polymer are supported by scanning electron microscope (SEM), Fourier transform infrared, and X-ray diffraction (XRD) studies. The modification of the polymer is indicated by the appearance of new absorption bands in infrared spectra, due to the formation of dihydropyrazole ring and the interaction of Ag NPs with the main chain of the polymer. XRD revealed the amorphous polymer with an improved degree of crystallinity in the case of nanocomposites. The polymer was found thermally stable up to 210°C, and the stability improved by the addition of 4,5-dihydro-1 H-pyrazole (325°C) and Ag NPs (up to 360°C). The polymer looks fibrous in SEM micrographs and a decrease in this character is observed on modification. The optical and fluorescence properties warrant its use in LEDs and as an ultraviolet absorber.

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Synthesis and Characterization of Acetone-Terephthalaldehyde Polymer and its Oligomers

Cited by 2 publications

References 5 publications

A Benign Synthesis Route to Terephthalic Acid via Two-Step Electrochemical Oxidation of P-xylene

A Benign Synthesis Route to Terephthalic Acid via Two-Step Electrochemical Oxidation of P-xylene

Optical and thermal studies of modified terephthaldehyde–acetone polymer

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