Thermal Degradation Mechanism of Polybenzoxazines

Ran, Qichao; Gu, Yi; Ishida, Hatsuo

doi:10.1016/b978-0-12-804170-3.00011-1

Cited by 22 publications

(33 citation statements)

References 45 publications

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“…It was proposed that the thermal decomposition of polybenzoxazines occurs stepwise [ 46 , 47 , 48 ]. At the first stage of the destruction, aromatic compounds are formed (benzene, derivatives of phenol, aniline).…”

Section: Resultsmentioning

confidence: 99%

Benzoxazine Monomers and Polymers Based on 3,3′-Dichloro-4,4′-Diaminodiphenylmethane: Synthesis and Characterization

et al. 2021

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To reveal the effect of chlorine substituents in the ring of aromatic amine on the synthesis process of benzoxazine monomer and on its polymerization ability, as well as to develop a fire-resistant material, a previously unreported benzoxazine monomer based on 3,3′-dichloro-4,4′-diaminodiphenylmethane was obtained in toluene and mixture toluene/isopropanol. The resulting benzoxazine monomers were thermally cured for 2 h at 180 °C, 4 h at 200 °C, 2 h at 220 °C. A comparison between the rheological, thermal and fire-resistant properties of the benzoxazines based on 3,3′-dichloro-4,4′-diaminodiphenylmethane and, for reference, 4,4′-diaminodimethylmethane was made. The effect of the reaction medium on the structure of the oligomeric fraction and the overall yield of the main product were studied and the toluene/ethanol mixture was found to provide the best conditions; however, in contrast to most known diamine-based benzoxazines, synthesis in the pure toluene is also possible. The synthesized monomers can be used as thermo- and fire-resistant binders for polymer composite materials, as well as hardeners for epoxy resins. Chlorine-containing polybenzoxazines require more severe conditions for polymerization but have better fire resistance.

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Section: Resultsmentioning

confidence: 99%

Benzoxazine Monomers and Polymers Based on 3,3′-Dichloro-4,4′-Diaminodiphenylmethane: Synthesis and Characterization

et al. 2021

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“…The reason for this occurrence could be linked to the degradation of the amine parts in the crosslinked structure of PBz. According to Ran et al, 28 the amine part is easier to cleave during degradation due to the weak C-N bond which can also be observed as weight loss of the aromatic amine in the thermogravimetric analysis. For the lower two-step temperature treatment condition of 120 C and 160 C in Fig.…”

Section: Sem-edx Analysis Of Thermally-modied Bersmentioning

confidence: 99%

“…The signicant impact of this lower curing temperature was the lower onset temperature of curing with signicantly lower exothermic peak temperature of 198 C. Although the ber mat was not 100% cured, at this curing condition the thermal degradation between 200-300 C due to loss of aromatic amine was avoided. 28 This thermal treatment condition prevented the melting of bers and complete loss of microstructures but more importantly, contributed in enhancing the stiffness and strength of the ber networks. Another important benet of this lower thermal treatment condition is its effect on the structural stability and mechanical integrity of the ber mat.…”

Section: Thermal Property and Stability Of Pbz/sdib Bersmentioning

confidence: 99%

Effect on thermal stability of microstructure and morphology of thermally-modified electrospun fibers of polybenzoxazines (PBz) blended with sulfur copolymers (SDIB)

2021

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“…It was proposed that the thermal decomposition of polybenzoxazines occurs stepwise [31][32][33]. At the first stage of the destruction, aromatic compounds are formed (benzene, derivatives of phenol, aniline).…”

Section: Thermal Properties and Fire Resistance Of Diamine-based Polybenzoxazinesmentioning

confidence: 99%

Benzoxazine Monomers and Polymers Based on 3,3’-Dichloro-4,4’-Diaminodiphenylmethane: Synthesis and Characterization

Petrakova¹,

Киреев²,

Onuchin³

et al. 2020

Preprint

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As a result of this work, a previously unreported benzoxazine monomer based on 3,3'-dichloro-4,4'-diaminodiphenylmethane was obtained, characterized by 1H and 13C NMR spectroscopy, and its thermal and rheological properties were studied. A comparison between the properties of benzoxazines based on diamines (3,3'-dichloro-4,4'-diaminodiphenylmethane and 4,4’-diaminodimethylmethane). The effect of the reaction medium on the structure of the oligomeric fraction and the overall yield of the main product was studied. The synthesized monomers can be used as thermo- and fire-resistant binders for polymer composite materials, as well as hardeners for epoxy resins.

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Thermal Degradation Mechanism of Polybenzoxazines

Cited by 22 publications

References 45 publications

Benzoxazine Monomers and Polymers Based on 3,3′-Dichloro-4,4′-Diaminodiphenylmethane: Synthesis and Characterization

Benzoxazine Monomers and Polymers Based on 3,3′-Dichloro-4,4′-Diaminodiphenylmethane: Synthesis and Characterization

Effect on thermal stability of microstructure and morphology of thermally-modified electrospun fibers of polybenzoxazines (PBz) blended with sulfur copolymers (SDIB)

Benzoxazine Monomers and Polymers Based on 3,3’-Dichloro-4,4’-Diaminodiphenylmethane: Synthesis and Characterization

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