A bi-DOPO type of flame retardancy epoxy prepolymer: Synthesis, properties and flame-retardant mechanism

A bi-DOPO type of prepolymer for flame retardancy epoxy resins with intrinsically flame-retardant was successfully synthesized by reacting of 6,6'-((6,6'-dihydroxy-[1,1'-biphenyl]-3,3'-diyl) bis (propane-3,1-diyl)) bis(dibenzo[c,e][1,2] oxaphosphinine 6-oxide) (DOBP) with bisphenol A. The characterization of the cured epoxy resins, such as cone calorimeter, TGA/infrared, Raman and SEM indicated that DOBP with double 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) structure endowed the epoxy resins with excellent flame retardancy, including limiting oxygen index of 40.0%, V-0 rating in UL-94, remarkable smoke suppression and flame inhibition. The quenching effect of gaseous phase and charring effect of condensed phase of phosphaphenanthrene groups in prepolymer together contributed to the improvement on the flame retardant performance of the epoxy resins. In addition, due to the rigid structure of DOBP molecules, the cured d-FREP possessed high glass transition temperature of up to 192.9 degrees C, and the tensile modulus of which was increased about 55% compared with the neat epoxy resins. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A bi-DOPO type prepolymer was successfully synthesized for flame retardancy epoxy resins, showing excellent flame retardancy with high limiting oxygen index and V-0 rating in UL-94, as well as remarkable smoke suppression and flame inhibition. The phosphaphenanthrene groups in the prepolymer contributed to the improvement of flame retardant performance, while the rigid structure of DOBP molecules increased the tensile modulus of the cured epoxy resins.