Thermal polymerization of benzoxazine monomers followed by GPC, FTIR and DETA

Gârea, Sorina Alexandra; Iovu, Horia; Nicolescu, Alina; Deleanu, Călin

doi:10.1016/j.polymertesting.2006.09.011

Cited by 52 publications

(43 citation statements)

References 17 publications

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“…However, consecutively, the loss factor increases afterwards, a tendency also observed in bulk benzoxazine BA-a by other authors [41]. It seems difficult to attribute this increase in loss factor to a decrease in viscosity, which would be in contradiction with the DSC results as well as DMA results available from literature [41] showing the curing to proceed continuously at 180 • C. As a consequence, the ion concentration n in (Eq. (5)) should increase more rapidly than the viscosity increases.…”

Section: Dea Analysismentioning

confidence: 74%

Thermal curing study of bisphenol A benzoxazine for barrier coating applications on 1050 aluminum alloy

Escobar

Poorteman

Dumas

et al. 2015

Progress in Organic Coatings

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Section: Dea Analysismentioning

confidence: 74%

Thermal curing study of bisphenol A benzoxazine for barrier coating applications on 1050 aluminum alloy

Escobar

Poorteman

Dumas

et al. 2015

Progress in Organic Coatings

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“…As shown in Figure b, the characteristic absorption band of the oxazine ring at 948 cm −1 and the 1,2,4‐trisubstituted benzene ring in 1492 cm −1 disappeared under normal pressure. In addition, the mono‐substituted benzene ring at 692 and 750 cm −1 remained unchanged, and 1,2,3,5‐tetrasubstituted benzene ring appeared at 1482 cm −1 , which indicates the formation of phenolic Mannich bridge . The FTIR spectrum of poly(BA‐a‐p), as shown in Figure c, was almost the same as that of poly(BA‐a‐n).…”

Section: Resultsmentioning

confidence: 79%

Curing Reaction of Benzoxazine Under High Pressure and the Effect on Thermal Resistance of Polybenzoxazine

Zeng

Huang

Ren

et al. 2018

Macro Chemistry & Physics

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Two benzoxazine monomers, bisphenol A/aniline type benzoxazine (BA‐a) and bisphenol A/tert‐butylamine type benzoxazine (BA‐tb), are prepared with high purity. Their curing behaviors and cure kinetics are studied by high pressure differential scanning calorimetry (HP DSC) at normal pressure and high pressure, respectively. Meanwhile, the apparent activation energy (E a) is calculated by Kissinger and Ozawa methods. The results show that the curing reaction temperature and E a of BA‐a are little influenced by high pressure, but for BA‐tb, its curing reaction temperature and E a increase greatly. FTIR is used to analyze the difference in the hydrogen bonds in cross‐linking structures of cured BA‐a and BA‐tb. Also, molecular simulations are used to figure out the effect of the high pressure on chemical structures. It is found that the content of hydrogen bonds in polybenzoxazines cured at high pressure increases, resulting in the decrease of cross‐linking densities. Moreover, DSC and thermogravimetric analysis tests are carried out to study the thermal resistance of these polybenzoxazines, and the results indicate that their glass transition temperatures (T gs) and thermal stability decrease after curing at high pressure.

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“…In the presence of amine, meanwhile, phenols are transformed to benzoxazines containing the five‐membered heterocyclic compound by the reaction with formaldehyde and amine. During cure process, benzoxazine rings are opened and condensed to give network‐structured phenolic resin similar to the novolac …”

Section: Resultsmentioning

confidence: 99%

Preparation of Porous Carbons Under Basic Condition by Soft Template Method for Carbon Capture

Park

Han

Lee

2015

Bulletin Korean Chem Soc

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Microporous and mesoporous carbons have been prepared by a soft template method using 2,2 0 -biphenol as a precursor. The porosity of carbons could be controlled by varying the amount of block copolymer used as a soft template and the specific surface areas measured were as high as 648 m 2 /g with a pore volume of 0.43 cm 3 /g. The surface areas of prepared carbons were further increased up to 1778 m 2 /g with a pore volume of 0.75 cm 3 /g after heat treatment under ammonia gas environment. Although the prepared pristine carbons had lower surface areas than commercial activated carbon, they exhibited higher carbon dioxide (CO 2 ) adsorption capacity. The CO 2 adsorption capacity of ammonia-activated carbons further increased up to 2.98 mmol/g at ambient temperature and pressure.

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Thermal polymerization of benzoxazine monomers followed by GPC, FTIR and DETA

Cited by 52 publications

References 17 publications

Thermal curing study of bisphenol A benzoxazine for barrier coating applications on 1050 aluminum alloy

Thermal curing study of bisphenol A benzoxazine for barrier coating applications on 1050 aluminum alloy

Curing Reaction of Benzoxazine Under High Pressure and the Effect on Thermal Resistance of Polybenzoxazine

Preparation of Porous Carbons Under Basic Condition by Soft Template Method for Carbon Capture

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