Azo-polysiloxanes thermal stability study

Lisă, Gabriela; Păiuş, Cristina; Raicu-Luca, Alina; Hurduc, Nicolae

doi:10.1177/0954008312444294

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…Our previous study found that amino (-NH2) groups in azodicarbonamide could copolymerize with oxazine rings in PN resin and result in an azo-containing intermediate (Figure 1c) [29]. In addition, it has been reported that azo-containing compounds are thermally active, and the thermal stabilities of azocontaining linear polymers are limited to 200-350 °C [47][48][49], conforming to the Tdm1 (294 °C) of this work. Furthermore, as the temperature increased, there was a continuous exothermic phenomenon in the DSC curves of original the PN foam due to the decomposition of the azo-containing section in the PN foam (Figure S3).…”

Section: General Thermal Degradation Behavior Of Pn Foam By Tga-dtgsupporting

confidence: 86%

“…NH 3 should not be generated from the final curing products. On the other hand, it has been reported that NH 3 is one of the decomposition products of azo-containing compounds [47][48][49]. In addition, some volatile gases, including NH 3 , CO 2 , H 2 O, etc., were produced during the foaming process.…”

Section: Monitoring Thermal Degradation Of Pn Foam By Tga-ftirmentioning

confidence: 99%

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Understanding the Thermal Degradation Mechanism of High-Temperature-Resistant Phthalonitrile Foam at Macroscopic and Molecular Levels

Yang,

Li,

Lei

et al. 2023

Polymers

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Polymer foam, a special form of polymer, usually demonstrates some unexpected properties that rarely prevail in the bulky polymer. Studying the thermal degradation behavior of a specific polymer foam is important for its rational design, quick identification, objective evaluation, and industrial application. The present study aimed to discover the thermal degradation mechanism of high-temperature-resistant phthalonitrile (PN) foam under an inert gas atmosphere. The macroscopic thermal decomposition of PN foam was carried out at the cost of size/weight loss, resulting in an increasing number of open cells with pyrolyzation debris. Using the TGA/DTG/FTIR/MS technique, it was found that PN foam involves a three-stage thermal degradation mechanism: (I) releasing gases such as H2O, CO2, and NH3 generated from azo-containing intermediate decomposition and these trapped in the closed cells during the foaming process; (II) backbone decomposition from C-N, C-O, and C-C cleavage in the PN aliphatic chain with the generation of H2O, CO2, NH3, CO, CH4, RNH2, HCN, and aromatic gases; and (III) carbonization into a final N-hybrid graphite. The thermal degradation of PN foam was different from that of bulky PN resin. During the entire pyrolysis of PN foam, there was a gas superposition phenomenon since the release of the decomposition volatile was retarded by the closed cells in the PN foam. This research will contribute to the general understanding of the thermal degradation behavior of PN foam at the macroscopic and molecular levels and provide a reference for the identification, determination, and design of PN material.

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