Curing of Epoxy Resin DER-331 by Hexakis(4-acetamidophenoxy)cyclotriphosphazene and Properties of the Prepared Composition

• DOI: 10.3390/polym11071191
• Publication Date: 2019-07-17T06:44:03Z
• Authors: Evgeniy M. Chisty...; Ivan V. Terekhov; Aleksey V. Shapagin; Sergey N. Filatov; Vladimir P. Chuev
• Keywords: noncombustibility; polymer chemistry; amide cure; 02 engineering and technology; chemistry; phosphazenes; 0210 nano-technology; thermostability; Article; epoxy resin; coke

The method of optical wedge revealed that the optimum temperature for compatibility of hexakis(4-acetamidophenoxy)cyclotriphosphazene (ACP) and DER-331 epoxy resin is in the range of 220–260 °C. The interdiffusion time of components at these temperatures is about 30 min. The TGA and differential scanning calorimetry (DSC) methods revealed the curing temperature of 280 °С for this composition. IR spectroscopy confirmed that the reaction between the resin and ACP is completed within 10 min. According to the DSC data, a glass transition temperature of 130 °С was estimated for the cured resin. Combustion test UL-94 demonstrated that the obtained material can be assigned to the fireproof category of V-0. Burning droplets were not formed during the burning. The coke formed during the combustion of samples possessed a dense and porous structure. The shape of pores is closed, while their size is in the range of 0.2–200 µm.