2020
DOI: 10.1016/j.cej.2019.122237
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Catalysis for highly thermostable phenol-terephthalaldehyde polymer networks

Abstract: There is a crucial need to eliminate formaldehyde (F) from high-performance thermoset formulations. We propose herein the study of innovative phenol (P)-terephthalaldehyde (TPA) resole, synthesized under basic conditions. For aerospace applications, alkali-or alkaline-earth-based catalysts should be avoided because they degrade the polymer performances in real conditions. To address this issue, we successfully employed DBU to catalyze the resole formation and compared the mechanisms and performances to the usu… Show more

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Cited by 22 publications
(17 citation statements)
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“…The theoretical considerations and computational detail can be found in our previous articles. [17,20,21]…”
Section: Thermo-kinetics Analysismentioning
confidence: 99%
See 1 more Smart Citation
“…The theoretical considerations and computational detail can be found in our previous articles. [17,20,21]…”
Section: Thermo-kinetics Analysismentioning
confidence: 99%
“…[31] These results are in line with our work on formaldehyde-free resoles, whose crosslinking mechanisms involved several chemical reactions. [17,20,21]…”
Section: Curing Kineticsmentioning
confidence: 99%
“…For example, sodium sulfite or sodium metabisulfite contain alkalis that should be avoided in thermal protection systems. 39 For the same reason, although NaOH is often chosen as a catalyst for the synthesis of resoles, ammonia catalysis was preferred in this work. Furthermore, resins synthesized with ammonia versus NaOH are described as being more heat resistant, having a higher molecular weight, having lower water solubility, higher glass transition temperature, and being slightly less crosslinked (associated with better mechanical properties).…”
Section: ■ Introductionmentioning
confidence: 99%
“…In addition, although some additives can maintain or improve thermostability, they are not compatible with aerospace applications. For example, sodium sulfite or sodium metabisulfite contain alkalis that should be avoided in thermal protection systems …”
Section: Introductionmentioning
confidence: 99%
“…The replacement of the formaldehyde was recently proposed using several bio-based, non-hazardous aldehydes with phenol [24][25][26]. Among the aldehydes studied, terephthalaldehyde (TPA) with the presence of a second aldehyde in para-position showed the best reactivity [25][26][27]. Additionally, the synthesized phenol-terephthalaldehyde resin displayed a highly crosslinked network which is an interesting property for the purpose of using them in solid-liquid extraction processes.…”
Section: Introductionmentioning
confidence: 99%