Aminobenzothiazole-substituted cyclotriphosphazene derivative as reactive flame retardant for epoxy resin

Publication date: Available online 9 November 2019Source: Reactive and Functional PolymersAuthor(s): Jianwen Cheng, Jun Wang, Shuang Yang, Qianqian Zhang, Yefa Hu, Guoping Ding, Siqi HuoAbstractAminobenzothiazole-substituted cyclotriphosphazene derivative (ABCP) was successfully synthesized and used as reactive flame retardant to improve the fire safety of epoxy resin (EP). The chemical structure of ABCP was confirmed by Fourier transform infrared spectroscopy (FTIR), 1H and 31P nuclear magnetic resonance (NMR), high-resolution mass spectroscopy (HR-MS) and elemental analysis (EA). The curing behavior, thermal stability, thermo-mechanical property and flame retardancy of the prepared EP systems were studied. The differential scanning calorimeter (DSC) results indicated that ABCP induced the anionic polymerization of EP and facilitated the addition reaction between EP and 4,4′-diamino-diphenyl sulfone (DDS). The thermogravimetric analysis (TGA) results indicated that ABCP accelerated the thermal degradation of EP matrix and contributed to the formation of more residual chars with better thermo-oxidative stability. The dynamic mechanical analysis (DMA) results indicated that EP/DDS/ABCP thermosets exhibited higher storage modulus at 50 °C and their glass transition temperature (Tg) values were slightly reduced by 6–10 °C, in comparison with EP/DDS thermoset. The combustion test results revealed the fire hazards of EP/DDS/ABCP thermosets were effectively reduced. Compa...

Source: Reactive and Functional Polymers - November 10, 2019 Category: Chemistry Source Type: research