Flame‐Retardant Mechanism of Benzoxazine Resin with Triazine Structure

Abstract

Benzoxazion resins have attracted a great deal of interests due to their excellent flame-retardant property. In this paper, a benzoxazion resin with a triazine structure was synthesized successfully and the flame-retardant mechanism of the resin was discussed. Its flammability property and the thermal decomposition were measured and analyzed with a cone calorimeter and thermogravimetry-differential scanning calorimetry-mass spectrometry. The chemical structure as well as the surface morphology of the cured resin after combustion was characterized by Fourier transform infrared and scanning electron microscopy. The results illustrated that little heat was released during the ignition process of the cured resin. The gas including NO 2 , CO 2 , H 2 O, and a few CO were produced during the thermal decomposing. With the surface of the cured resin after combustion covered with the layer of the triazine structure, the benzoxazine resin with the triazine structure exhibits a desirable property of a flame retardant.

Preparation of poly(melamine‐formaldehyde‐2,2′‐bis(trifluoromethyl)benzidine) high‐performance fibers

“…From the LOI results, it can be found that the MFF and MFF‐TFMB fibers have good flame‐retardant properties. Because the high nitrogen content of the triazine ring has an inhibitory effect on fiber burning 6 . At high temperatures, the nitrogen‐containing groups of the triazine ring decompose into non‐combustible gases, which can dilute the oxygen in the air and reduce the concentration of combustibles generated by the thermal decomposition of polymers.…”

“…Because the high nitrogen content of the triazine ring has an inhibitory effect on fiber burning. 6 At high temperatures, the nitrogen-containing groups of the triazine ring decompose into non-combustible gases, which can dilute the oxygen in the air and reduce the concentration of combustibles generated by the thermal decomposition of polymers. Nitrogen oxides generated by thermal decomposition can capture free radicals and inhibit the chain reaction of polymer combustion, thereby achieving the purpose of flame retardant.…”

“…The high nitrogen content of the triazine ring endows the MF polymer with excellent heat-resistance and flame-retardant properties. [4][5][6] The polymer has poor solubility in the water system, and the obtained spinning solution has poor spinnability. BASF 7 used centrifugal spinning to prepare Basofil ® fiber, which is the only industrialized product at present, but Basofil ® fiber is generally only used for blending to prepare fiber products such as felt.…”

“…The triazine ring units are connected by methylene or methylene ether bonds. The high nitrogen content of the triazine ring endows the MF polymer with excellent heat‐resistance and flame‐retardant properties 4–6 . The polymer has poor solubility in the water system, and the obtained spinning solution has poor spinnability.…”

Thiadiazole-Derived Covalent Organic Framework Macroscopic Ultralight Aerogel

“…These detected inert gases can dilute the concentration of combustible gases, thereby achieving a flame-retardant effect. 37,38,43 Moreover, the microscale combustion calorimeter (MCC) was used to measure the heat release rate of NNS-VCOF aerogel against temperature. From the curves, quantitative information related to the combustion properties of aerogels can be obtained including the peak heat release rate (PHRR) and corresponding temperature (TPHRR), total heat release (THR), heat release capacity (HRC), as listed in Figure 4i inset table.…”