期刊
POLYMERS
卷 13, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/polym13020263
关键词
benzoxazines; phosphazenes; curing kinetics; flammability; flame retardant; catalysis; m-toluidine
资金
- Ministry of Science and Higher Education of the Russian Federation [05.604.21.0231, RFMEFI60419 x 0231]
A novel phosphazene additive that acts as both a catalyst and a flame retardant for benzoxazine binders was presented in this study. The modified compositions showed improved thermal and flammability characteristics, with a more efficient curing process and lower reaction initiation temperature.
A novel type of phosphazene containing an additive that acts both as a catalyst and as a flame retardant for benzoxazine binders is presented in this study. The synthesis of a derivative of hexachlorocyclotriphosphazene (HCP) and meta-toluidine was carried out in the medium of the latter, which made it possible to achieve the complete substitution of chlorine atoms in the initial HCP. Thermal and flammability characteristics of modified compositions were investigated. The modifier catalyzes the process of curing and shifts the beginning of reaction from 222.0 degrees C for pure benzoxazine to 205.9 degrees C for composition with 10 phr of modifier. The additive decreases the glass transition temperature of compositions. Achievement of the highest category of flame resistance (V-0 in accordance with UL-94) is ensured both by increasing the content of phenyl residues in the composition and by the synergistic effect of phosphorus and nitrogen. A brief study of the curing kinetics disclosed the complex nature of the reaction. An accurate two-step model is obtained using the extended Prout-Tompkins equation for both steps.
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